Luận văn Một số cải biên trên mô hình Dexter

TRUONG D,;J HQC T6NG HQP TP. HO CHi MINH 0Jro NguOithvchi~nNguyen Hi$p Doan Detili Mat socaibientrenmahinhDexter. ChuyenngilnhTin hoc. LUAN VAN THAC si KHOA HOC. . . Nglioi hlidngdan 1'sDong'ThiBichThuy THANH PHO fiG ~H(,MINH - 1997 ... ? LO1 CAM TA. '§>G~ Toi xinchanthanhearndnTiensi DangThj BichThuy,ngu'oid3:t~n tinhhu'angclanvadQngvienWihoanthanhlu~nvan. Xin goiWiearndndentatcacaeb~ndangnghi~pd3:giupdovadang gapykiengiuptoihoanthanhdetainay. Toi xinbayto longbietdndoivai charnt;,caeanhchiemvacaeb~n thand3:khuyenkhichWitrongquatrinhth\fchi~ndetai. TpHaChiMinh,ngay19/6/1997 NguyenHi~pDoan MT)C LT)C TOMTAT 3 CHUONG1: lit COSa DULIeU HYPERMEDIA 4 1-Md DAD """"""""""""" 5 Ll - Khaini~mva-cach~hypertext,hypennedia,multimedia 5 L2-Nhilnglingdpngcuah~thonghypennedia 5 11-$ THONGCSDL HYPERMEDIA 6 IL 1-Djnhnghla 6 IL2-D{ictrungcuam9th~llMDB ; 6 IL3- Cackhaini~mcdbantrongllMDB 7 IL4- Cacyeudiu dOlv(jim9tmohinhllMDB 7 111-WORLDWIDEWEB(WWW) 8 IlL 1-Ljch su WWW 8 IIL2- Ngonngil'HTML 8 IIL3- WWW vah~CSDLhypennedia 9 N - MVc TIEDDETAl : 10 CHUONG2: M(n s6 MOHINHDULI:E;UHYPERMEDIA 11 1-MOHINHDEXTER 12 L1- Tilng1u'utril' 12 L2- Tilngbelltrong :..13 L3- Tilngthl/chi~n 14 L4-M{itphfincachgiil'atfi'ngbelltrongvatfi'ng1u'utril' 14 L5-M{itphfincachgiil'atfi'ng1u'utril'vatfi'ngthl/chi~n 14 L6-Link 15 L 7-Anchor 17 L8- Compositecomponent 17 II - Mo HINHAMSTERDAM 18 ILl- Gi(jithi~u 18 IL2- Kenhtr1nhdiln 18 IL3- CacmOllienh~thiligian 19 IL4- Sl/ tonghc;lpcaccompositecomponent 19 IL5-Ngil'canhcualink 20 III- Mo HINHVILAS-SATIDSINGKORAPOOM 23 IlL 1-CacdOltllc;lngcdban 24 IIL2- Dieukhiendongb9hoabrowse 26 TTTf A A' A , ~ A , CnuONG 3: MQT SON~N XET VE MO HINH HMDB 28 1-MC5DAD 29 II- ANCHOR : 29 IL 1-Djnhnghlaanchor 29 1 112-N(Hdunganchor 30 113-Thongtintrlnhdiln cilaanchor 3] 114-Anchor Gang1acomponent""""""""""""""""""""""""""""""""""""""""" 32 115-Anchorvagiaodi~nngu'aidung 33 111-COMPOSITECOMPONENT 33 IV -ANCHOR TRONG COMPOSITE COMPONENT 35 V- LINK 37 V.1-Link vaanchorkhongdanhdffu 37 v.2-cffutruccilalinkcomponent 37 V.3-Caclinkkhongchllt " 39 V.4-Link camngilcanh 40 v.5-Chieudaimedia 42 CmJONG 4-MO HINH DEXTER CAI TIEN 45 I- DANNHAP 45 II- BE XUATCACTHAY DOlTRONGMOHINHDEXTER 45 11]- Tinhmd cilah~thong." .."; 45 17.2Kh ? ~ b.A? di"" ' Jj'A 1,'""' dilli A ? A hi'-l..'t~ '"'" 45. - anang'leu enva enLl.et yUcuamo LllLuexuat.".................................. 111-CACTHANHPHANCUAMOHINH 46 IV- Kientruch~thongCSDL hypermediatheomohinhcJi tien 49 CmJONG 5 : MOT s6 CAI D~T CHV YEU TRONG MO IDNH HMDB 50 I - CArDATTANGLVU..TRU 51 11-Bllt vandJ 51 12-Phantfch 51 II - CArDATVI~CTHVcHI~NMOTGIAOTAC " 56 111-Bllt vande: 56 112-Phan tfch 56 HlfONG PHA T TRn~N MO HINH CSDL HYPERMEDIA 60 'A ? TAl LII::U THAM KHA 0 61 2 Chlidng1 : H~cdsddfi li~uhypermedia Vi~cphcitri€n caephuongti~nnghenhlnva ky thui;tttruy€n thongdi'i d~nd€n slfhlnhthanhWorldWideWeb.Tuyvi;ty,lingdlJ.ngchuy€u cua Webchi la phanph6ithongtin.Vi~ct(;lOcaetdnhdi6nconkh6khanva vi~clienk€t diI li~uchuamangtinhch~tchecao. Ph~nnaytdnhbay mQtquandi€m v€ vi~cdinhnghIava mQtso'khai ni~mcobantrongCSDLhypermedia. 4 ? " I-Mddfiu 1.1- Khai ni~mv~caeh~hypertext,hypermedia,multimedia . Hypertextla mQtvanbanc6 th€ truyxua'tkhongtuye'ntinh.Van bandu'Qct6 chlicthanhcacchuderiengbil$t,vangu'oidungc6th€ d~dangchuy€ntuchude naysangchudekhacmakhongdn phaidQctugnt1ftutrenxu6ngdu'ai.Cacht6 chlicnhu'V?yra'thichhQpchovil$ctruyxua'thongtintrenmaytinh. . Multimediat?PtrungVaGnhungphu'angtil$ntruyenthongkhongchila vanban maconla amthanh,phim,...Cacmediasedu'Qctrlnhdi~nrheamQthlit1ftu'ang quailvainhautuyrheas~pxe'pcuangu'oibienso~n. . Hypermediala hl$th6ngkhongnhungchophepdieuhu'angrheaca'utrucqua su6tcactai lil$u,maconchophepnh6mnhieumedial~i,t~othanhmQttrlnh di~n. 1.2-Nhungti'ngd\lngcuah~th6nghypermedia 1) Giuplamvil$client\lCrhealudngsuynghI. Theocachso~nthaotruyenth6ng,tacgiaphaiphacthaocacnetchinhrdi mai phartri€n chitie't.Khi congvil$cphartri€n, tacgiasekh6rhead6idgydu s1fphar tri€n cacytu'dng,clingnhu's1flienhl$giuacacy tu'dngvainhau. B~ngcongC\lhypermedia,tac6th€ phartri€n chi tie'tcacy tu'dngtru'acvad~t trongcacchuderiengbil$t.Saild6lienke'tcacchudel~ivainhau. 2) HI$th6ngtrQgiup Hypermediagiupngu'oidungtlmkie'mthongtinnhanhch6ngva tha'yngaycac thongtin lienhl$dn thie'tkhac.Hannua,dohypermediac6th€ t6nghQpcaclo~i thongtinkhacnhaunhu'amthanh,phim,...nenc6th€ dunglamcacchu'angtrlnhd~y hQc,sachthamkhao,tudi€n, quangcaovabansanphilm... 3) Duytrls1flienWctrongcongvil$c Hypermediala mQthl$th6ngmd,chophepngu'oidungrichhQpcacling d\lng mai,cacd~ngthongtinmaiVaGhl$th6ngvalienke'tchungl~ivai nhau.Trongmoi tru'onghypermedia,ngu'oidungc6th€ sad\lngnhieulingd\lngkhacnhauchocung mQtcongvil$c. 4) T~oprototype Hypermediadu'Qcdungd€ t~ocacprototypegiaodil$nmQtcachnhanhch6ng. 5 II - H~th6ngCSDL hypermedia 11.1-Dinh nghia H~cosddli li~uhypermedia(HMDB)baog8mcacquatdnht~o,hill tm,truyxua't vaxU'ly cacdli li~u(nhu'vanban,hlnhanh,bangbieu,band8, ...)d d~ngdi~ntU'. Ngoaicacd~ngdli li~u"tInh"nhu'tn3n,h~th6ngclingh6 trQcac d~ngdli li~u "dQng"(comangye'uto'thaigian)nhu'ho~thlnh,amthanh,phim,... Tu'tu'dngchuye'ucuamQtHMDB la t6chU'cdli li~umQteachphituye'n.Tli mQtdli li~u,ngu'aidungcothelc1ntheocaclinkdetruyxua'tcacdli li~ukhac.TrongHMDB, mQtdli li~ucothelamQt~phQpcoca'utruccuacacdli li~ukhac. Component2 Component1 moh 1-Minh ho~v~hypermedia 11.2-Dijc tru'ngciia m{)th~HMDB . Thaychocacmfiutin (record)vacact~ptin(file),caccomponentvalinkla nhlingca'utruccobancuah~th6ng. .. . Thay VI du'Qcca'ut~otli cacthuQctinh,mQtcomponentdu'Qcxem nhu la mQtd6i tuQngthuQcvaomQtlapnha'tdinhnaodo. . Caccomponentdu'Qcke'tn6ivdinhaunhu'mQtm~ngkhongh~nche'. . Vi~c xem nhanhla mQtyeti cc1ub~tbuQccua ht?th6ng.Nghla la ngu'aidungco thedi chuyenqual~igiliacaccomponentthongquacaclink de duyt?toanbQht? th6ng. 6 11.3-Caekbaini~mcdbantrongHMDB Atomiccomponent:la mQtdu li~ud d<;mgmah~th6ngc6 th~bi~udi6nnomQt cachdQcl?p. Anchor: lamQtphc1ncuanQidungcomponent. Link: la lienke'tdu'c;lct(;lOragiuacacanchor.MQtlinkgdmdanhsachcaccontrochi de'ncacanchor.M6i controc6hu'angvanQidungriengcuan6.M6i componentco mQtdanhsachcacanchoriengcuan6.M6i anchorc6mQtdanhdinhd~phanbi~t vai cacanchorkhactrongclingcomponentvai n6.MQtlink thamchie'ude'nmQt anchorthongquaC?p(componentidentifier,anchoridentifier). Compositecomponent: la componentdu'c;lcxay dlfngtu cac componentkhac (atomicho?ccomposite)vacaclink.H~th6ngd6ixii'vai caccompositecomponent hoanloangi6ngnhu'cacatomiccomponent.Caccompositecomponentkhongdu'c;lc chuachinhn6mQtcachtIVctie'pho?cgiantie'p. 11.4-CaeyelleftudolvoimQtmoblobHMDB TheoVilasWuwongsevaSatidSingkorapoom[1],moh'inhHMDB phaithoacaeyell cc1usail: 1. C6khanangtichhc;lpcacki~uduli~ukhacnhauvaoh~th6ng. 2. C6khanangmotacacthlfcth~c6ca'utruccao. 3. C6 slfphanbi~tgiuaca'utrucbell trongvaslfbi~uhi~nbell ngoaicuacacd6i tu'c;lng. 4. Co coca'ut6nghc;lpthichdangvatinC?yd~nh6mcacd6itu'c;lngvaomQthlfcth~. / .A 0mucquaillllym. 5. Phaic6 nhungcachdi6ndichkhacnhaucuacacm6iquailh~giuanhungmiiu thongtin.M6i quailh~phingucanh(trongd6cacd?ctinhcuad6itu'c;lngthamchie'u dQcl?pvai d6itu'c;lngngudn),m6iquailh~camngucanh(trongd6cacd?ctinhcua d6itu'c;lngthamchie'un~mtrongngucanhd6i tu'c;lngngudn)va m6iquailh~chua dl;l'ng(chobie'tcacd6itu'c;lngca'uthanhd6itu'c;lng udn) 6. Phaic6coca'uh6trc;lchovi~cxemt6ngquatcosdduli~u.Ngu'oisii'dl,mgHMDB dn cocacti~nichchophephQquetquamQtcosdduli~umQtcachhi~uquavatheo nhieuphu'ongthuckhacnhau. 7. Co khanangt(;lOva dieukhi6ncacphienbancuacacmiiuthongtin.Cac d6i tu'c;5ngduli~uthu'ongxuyenbi thayd6i.Vi the'vi~cquailly phienbanla cc1nthie't trongvi~cphattri~nduli~u. 8. Mo hlnhphaih6trc;lchokhanangkhaitri~nvasii'ad6i.Cacquailni~mt6ngquat cuamohlnhkhongbie'tde'nngunghlacuatungthlfcth~chuyenbi~t.Dod6ngu'oisii' 7 dvngsekhaitri€n mohlnhVOlcacchilcnangmOlhaysaad6icacchilcnangdangco d€ thichhQphonVOlcacyetidu lingdvngcuahQ. 9. Khi t<;10mQtd6itu'Qngtunhungd6itu'Qngkhac,h~th6ngphaicomQtcoch€ bao damchovi~cdlu thanhkhongbi I?pvang. 10.Cffncosvh6trQvekhoangnhlncosdduIi~u,chiclingdlp nhungphffnthongtin vathaotacdud€ ngu'oisadvnghoanthanhcongvi~ccuahQ. TheoHalasz[2],h~th6ngcanphaicha'pnhi;lncacd<;1ngduIi~usail: . Computedcomponent:du li~uco nQidungIa k€t quacuamQttruyvffntren HMDB. Khi do,nQidungduIi~uIamQti;lpcaccompositevalink. . Virtualcomponent:du Ii~uchico nQidungvaohiethi hanh.NQidungduli~u khongdu'QcIu'utru trongco sd du Ii~u.Nhu'ngn€u co mQtcomponentkhac(link component)rovaocomponentIo<;1inay,thinophaidu'QcIu'utruthi;ltSvtrongcosd duli~u. Tachuytha'ycacnghiencUuveHMDBcocackhuynhu'angsail: . Du'acacthongtintrinhdi~nvaomohlnh. . Mo tathvcth€ d milcdQtrU'utu'Qngcaob~ngcaccocffut6nghQpvacacd<;1ngcffu trucduli~uphilct<;1p. . Mo tasvho<;1tdQngcuathvcth€ b~ngcachh6trQd<;1ngcomponentIa mQtchu'ong trinh,query,.... III. World Wide Web(WW»J 111.1-Lfch sll'WWW MQth~th6nghypermediadangdu'Qcsadvngph6bienhi~nnayIaWarldWideWeb, doTimvaRobertCailliaudu'ara vaonam1990.H~th6ngWWW dvatrenytu'dng hypertextdoTedNelsondu'aranam1965. Co th€ coiWWW Ia mQtti;lpcacti~nichgiupngu'oisadvngt<;10racactrangduli~u daphu'ongti~nvaphathanh!enInternet.-angdvngchinhcuaWEB Ia d€ phanph6i thongtin. 111.2-Ngon figii'HTML HTML (HypertextMarkupLanguage)Ia ngonngu so<;1nthaotrangdu li~utren WWW.HTML Ia mQtngonngudjnhd<;1ng,haydanhda'u(mark-up).MQtti;lptinvan bandu'Qcdanhdffub~ngcacthe(tag)HTML chophepngu'oitadQcdu'Qchungb~ng ffiQtIo<;1iphffnmemgQiIabQduy~t(browser).TheIamQtdo<;1nmadu'Qcgiaih<;1nbdi 8 da'u''. HTML khongmotatrangtai li~urheatungphc1ntii'nhuvi tri,kichco,matis~c,... NguQcl<;1i,HTML chigallthechonQidungt~ptinvoi nhlingthuQctinhnaGdoma saudochungduQcxacdinhbdichuangtrlnhduy~tdSxemt~ptin nay.HTML gall the chokiSu chli, chenVaGvan bancact~ptin dd ho<;1,amthanh,video, 0.. va t<;10ra cacm6ilienke'thlnhthlic. Saunay,cacbQduy~tconchophepnhungcacngonngli l~ptrlnhJava scriptva VisualBasicscriptVaGtrangHTML. Di€u naychophepnhlingnhaso<;1nthaotrang WEB t<;10khanangWongtacvoinguoidungvake'thQpWEB voicosddli li~u.Thttc te',m6itrangWEB cotuongtaclamQtchuangtrlnhcon. BQduy~tWEB gii'iyetidu vanh~nl<;1idli li~udn thie't.Dli li~ubaagdmt~ptin HTML vacact~ptinddho<;1,amthanh,videodu'QcgQide'ntrongt~ptinHTML. Khi dli li~udu'Qcnh~n,bQduy~tdinhhlnhkiSut~ptinrheaquydinhcuacactheHTML dachiravahiSnthitrangdli li~ucungvoicacthongtindaphu'ongti~ndi kern.Khi mQtlienke'tdu'QchQn,mQtyetidu truyc~pde'nmQttrangWEB khacdu'Qcgii'ilen Internet. DocumentObject(DocObject)vaOLE la nhlingcongngh~chophepngu'oidungtruy c~pvabienso<;1ntaili~ututrongbQduy~t. 111.3-WWW vah~CSDL hypermedia Sosanhh~th6ngwww voicacyetidu d6ivoimQth~CSDLhypermedia(11.4),ta cocacnh~nxetsau: . Ungdvngchuye'ucuaWWW lahilltrU,lienke'tvaphanph6ithongtin.Trangdli li~uWEB la'yn€n tangla mQtvanban,tudo chenthemcacmediakhacVaG.Cac ngon ngli Java va Visual Basic du'QcnhungVaGHTML dS tang kha nangtrlnh di~ncua trangdli li~u.Nhu'ngdi€u nay lam vi~cso<;1nthao trangWEB trd nen phlict<;1Pd6i voi ngu'oiso<;1nthaoVI thongtin trlnhdi~n,phu'ongthlic trlnhdi~nva nQidunghoa l~nVaGnhau. . NgonnglicobantrongWEB laHTML. VI HTML la mQtngonnglidinhd<;1ng,do dotrongWEB khongthSthttchi~nvi~cke'thual<;1icactrlnhdi~ndaco. . Vi~cdu'athemcactinhnangmoiva cacd<;1ngmediakhacVaG,da lamcacbQ duy~tlientvcphattriSn.Nhu'ngchinhdi€u naylamh<;1nche'khanangphattri€n cuah~th6ng.BQduy~tkhongth€ lamQtlingdvngv<;1nnangdu'Qc. . Caclienke'ttrenWEB la caclienke'tmQt-mQtva la caclienke'tthvdQng.Thttc te',lienke'tcoth€ lanhi€u dc1uvala mQtcoche'tichcttctrongvi~cnh~nvaxii'ly thongtin. . WWW khongxacdinhkhoangnhlnd6i voi cactrangdli li~uhoi;1cacbQph~n cuatrangdli li~u. 9 IV. Muc lieude'tAi:. . v~mijtme')hinh Lu?n vansekhaosatmQts6 mohinhCSDL hypermedia.Trencd sdphantichu'u khuyetdi€m cacmohinhnay,lu~nvanse de xua'tmQts6 cai tieDtrenmo hinh Dexter. CaccaitieDchuyeula d€ t~okhaDangd€ bQduy~tcoth€ tichhQpcacthanhph§n ngoaimakhongdn phaithayd6icactrlnhserverhaytrinhduy~t.Cacthanhph§n ngoainaycochU'cDangtrinhdieDcacd~ngmediamaiduQcduavaoh~th6ng. Ngoaira caccai tieDcongiilpchovi~ct6nghQpcaccomponentduQclinh dQng, phongphilhdn. . V~mij.tcaidij.t Chudngtrinhcai d~tse dungcd che MDI cuaWindowsd€ mo phongca'uhinh Client/Server.Dieu naysechophepsv chuy€nd6i de dangtrinhcai d~tsangcac trinhServervaClientthvcsv. Moi truongl~ptrinhla BorlandC 4.5.Trinhcai d~tduQCviet d d,~mghuangd6i tuQng.Theomohinhde xua't,cacthanhph§nbi€u dieDcacd',lOgmediase la cac thanhph§nbellngoaiduQctichhQpvaoh~th6ng.D€ thu~nti~nchovi~ct6nghQp cacthanhph§nmaitITcaccacthanhph§ndaco,cacthanhph§ntichhQpdingduQc caid~thanhcacd6ituQng. ServerseduQccaid~tla ndilu'utruvaclingca'pcacd6i tuQngmedia,cacthongtin rootad6ituQngmediavacacthongtinlienketcacd6ituQngdo.Clientla trinhv~n d~ngcacthanhph§ntichhQpd€ trinhdieDcacd6ituQngduQcclingca'ptITserver. 10 Chddng3 : MQts6nh~nxetv@mohlnhHMD B ThongtinhilltnrlIenmaytinhdmgngayeangphuet~p.Khongchilacae d~ngmedia,taili~uhilltn1'concoth€ laband6,bangbi€u, ...Caelo~itai li~unayl~iconhungquailh~phuet~pvoinhau. Mo hlnhDexterdu"aramQtkie'ntruemd,ehopheptichhQpnhieuki€u du li~ukhaenhau.Mo hlnhAmsterdamd~ttfQngHimvaovi~eke'thQpcae du li~unguyenthuyd€ t~ora mQttrlnhdi€n phuet~p.Mo hlnhVilas- Satiddu"ara khaini~mlink earnngueanhvaphanho~ehm~ngHMDB thanhcaem~ngcon. PhgnnayphantiehcaemohlnhHMDB trenvad\1atrencdsddod€ de xua'tmQts6di tie'nlIenmohlnhDexter. I- Mdday Dexterla mQtmohlnhma,chopheptichh<;lpnhieuki€u componentvaoh~th6ng HMDB. Trong mo hlnh nay,tgnghill trfi'dongvai tro chinhyeu : hill trfi'cac componentva m6i lien h~giii'acacthanhphgnvdi nhaunhugiii'acomponentva anchor,giii'aanchorvalink.Ca'utruc,cachthlictrlnhdi€n, vi~ctudnglac vdingu'ai dung,...cuacomponentla nhii'ngthanhphgnngoaidu<;lctichh<;lpvaotgngbelltrong cuah~th6ng.MQtlingd~ngHMDB dU<;lcxayd11ngtrennentfmgla tgnglu'utrfi'va tgngbelltrong. Tuy v~y,nhudatrlnhbaytrongchuang2.1,v~ncanmQtso'va'ndedn chuy trong mohlnhDexternhu'linkcodc1yducacthanhphc1nhu'mQtcomponentkhong?Vi~c truyenthongso'vanh~nketquaa caclinktinhloan?Vi~cdinhnghlacaccomposite componentvacacanchortrongcompositecomponent?... Mo hlnhAmsterdamneuva'ndevem6ilienh~thaigiangiii'acaccomponentvava'n dengii'canhchoanchorvalink,nghlalakhidi theomQtlinkthltrlnhdi€n hi~nthai codungl?i haykhong,cobienma'tkhonghaychithayd6imQtphc1n? Mo hlnhVilas-SatidSingkorapoomduara khai ni~mlink earnngii'canhd€ dieu khi€n s11dangbQgiii'acacthanhphc1ntrongmQtcompositecomponent.Tuy nhien mohlnhnaykhongdec~pdenkhaini~manchor. Mo hlnhAmsterdamva mohlnhVilas-SatidSingkorapoomduara mQtkhuonm~u trongvi~cdangbQcactrlnhdi€n multimedia.Nhu'ngchinhvi~cdu'arakhuonm~u nhuv~y,cacmohlnhnayda "clinghoa"vi~cph6ih<;lpcacmediad€ t?OnenmQt trlnhdi€n. Phc1nsailsexemxetl?i cackhaini~mcdbantrongmohlnhDexter.Tu dodu'flkhai ni~mlinkearnngii'canhcungvdimQtso'eailienkhacd€ giaiquyetcacva'ndetrong mohlnhDexter. II- Anchor 11.1-Binh nghiaanchor MQttrongnhii'ngdonggapchinhcuaDexterla vi~cxacdinhro cacanchor,lam thanhmQtdu n6i tukientrucm?ngtdi cacnQidungcomponentc~th€. Khongco anchor,caclinkchin6itdiloanbQcomponent.Tuyv~ymohlnhnayv~nchu'adu'ara mQtdinhnghladc1yduvat6ngquatveanchor.Mo hlnhAmsterdamdatrlnhbaymQt dinhnghlave anchorcuacompositecomponent,xemanchorcua mQtcomposite componentla t~pcacanchorcuacac atomiccomponentn~mavi tri nut la trongcay phanca'pcuacompositecomponentdo.(Chu'dng2.II.5-Ngii'eanhcualink). 29 Dinhnghlaanchorphaixua"tphMtITchinhbancha'tcuano : "anchorla mQtbQph?n cuanQidungdii'li~ucomponentva co theduqcchQnbdi nguoidung".Composite componentduqcca'uthanhtu caccomponentconchaucuano,nhuV?ycomposite anchorsela t?PcacbQph?ncuacaccomponentconchaucuacompositecomponent do.Ne'ugiathie'tlacacbQph?nnaydaduqcdinhnghlatrudc- nghlaladat6nt~icac anchorbieudi~nchung,thl compositeanchorse chinhla t~pcacanchornay.Noi cachkhac,compositeanchortrongtrUonghqpnaysela t?Pcacanchorconchau.Day clingchinhladinhnghlavecompositeanchortrongmohlnhAmsterdam. Lttuy la trongdinhnghlanay,cacanchorhoanloancothegiaonhauvadieunayla phuhqptrongcaclingd~ngthvcte'.Vi d~trongmQtcomponentband6motaday nui traidaiquamQtqu6cgia.R6 rang,anchorxacdinhdaynuise giaovdi anchor xacdinhqu6cgia.Ho~ctrongmQtcomponenttextg6mnhieuchudngm~c,an~horla mQtdo~nvansebi philbdianchorlachudngm~cchliado~nvando. 11.2-NQidunganchor NQidunganchorla cacthongtindexacdinhmQtbQph?nnQidungcomponent.NQi dunganchorcotheduqcxacdinhb~ngcachmotahaytinhloan(xem[2]).Tacothe chiara2 lo~ianchor- dQcl?pvdikieucuacomponent: . Anchordanhda'u: la mQtd6i tuqngduqcxacdinhtrVctie'ptutrongnQidung component.Vi tri cualo~ianchornaytrongnQidungcomponentdaduqcxacdinh ch~cch~n,khongph~thuQcvaolink truyxua"tde'nanchornayva clingkhongph~ thuQchQnIvacuanguoidung.. Vi d~: trongmQtbfllld6,anchorxacdinhbiengidimQtqu6cgiaduqcxacdinhr6 rangvac6dinh.Vi tricuaanchorkhongph~thuQcvaocaclinktroyxua'tde'nanchor nayvaclingkhongph~thuQcvaongu'oidung. Ho~cmQtvungvanbantrongdo~nvanduqcdanhda'uthamchie'u.Anchorxac dinhvungvanbannaydu'qcxacdinhb~ngoffsettud§udo~nvande'nvungvanban do.DaylamQts6du'qcxacdinhr6rangtuvi trivungvanbantrongdo~nvan. . Anchor khongdanhda'u: la khi vi tri anchortrencomponentduqcxacdinh thongquamQts6tinhloan. Vi d~,vdi kieudii'li~ud~ngtext,keywordla mQtlo~ianchorkhongdanhda'u. TrongWong hqpnay,anchorla mQtchu6iky tV.Vi~cl§n theolink de'nd§un6i chinhla vi~ctlm cac xua"thi~ncua chu6ikeywordtrongvan ban dii' li~ucua component.Ho~ctrenmQtbangtrongcdsddii'li~uquanh~,anchorcothedu'qcxac dinhb~ngmQtpheploanchQn(selection). Do vi tri anchorkhongdanhda'ukhongduqcxacdinhtrUdc,nennQidungcuano la tr6ng.Vi tri anchorkhongdanhda'uph~thuQcvaosttchQnlttacuangu'oidungho~c ph~thuQcvaoke'tquacualink tinhloankhi troyxua'tde'nanchornay.Ngu'oidung 30 xacdinhvi tri cuaanchorkhongdanhda'ub~ngcacphuongti~nnhumenu,button, dialogbox... 11.3-Th6ng tin trmh di~ncua anchor Componentdungcacthongtintrlnhdi€n cuanod€ xacdinhcachhi€n thicacanchor, cachhi€n thicacanchorgiaonhau.Ngoaira,m6ianchorconco th€ cocacthongtin trlnhdi€n rieng.Khi do,componentsedungcacthongtintrlnhdi€n riengcu.aanchor thaythe'chothongtintrlnhdi€n anchorcuacomponent. TheoDexter,d~un6icochuathongtintrlnhdi€n choanchortuongungvdid~un6i do.DieunaykhonghQp19.Vi nhuv~ythl tronghic so~nthaolink,nguoidungse phaiso~nthaocacacthongtintrlnhdi€n anchortrongcacd~un6ivadieunaylam bQso~nthaolinkthemphuct~p.HonmIa,VIanchormotamQtbQph~ng~nlienvdi component;nenthongtin trlnhdi€n anchornenduQcxacdinhtITchinhanchordo ho~ctil'cacthongtintrlnhdi€n component. Cacanchorclingco thongtinngii'nghlariengd€ guyracacthongtintrlnhdi€n m~c dinhchochung.Vi~cchQnthongtintrlnhdi€n choanchorduQcxacdinhtheonguyen t~ccacthongtin camngii'canhduQcuu tienhoncacthongtin trlnhdi€n phi ngii' canh.Hlnhsauchotha'ycacthongtintrlnhdi€n anchorvathO'tt1chQnlt1achung. CackhaibaocuamQtlopcomponent SinhnghlacaclOpanchor ThOngtintrinh di~nm{tcdinh cho component ThOngtintrinhdi~n m{tcdinhchotung lOpanchor 3 Component Anchor 1 Cacthongtintrinh di~nrH~ngcua component 2 Cacthongtintrinh di~nchoanchor ThOngtintrinhdi~n riengcuamQtanchor Hinh 11-Thu tll u'uti~ncuacaeth6ngtin tr'lnhdi~n Tranghlnhtren,thongtintrlnhdi€n cos6thU'tt1nhohancodQUuliencaohan. TrangmQtanchor,nQidunglacacthongtind€ xacdinhmQtbQph~ncuacomponent; conthongtintrlnhdi€n la thongtind€ componenttrlnhdi€n bQph~ndo.Neutrong anchorkhongxacdinhthongtintrlnhdi€n, thlthongtintrlnhdi€n anchordu'Qcdinh nghlatrangph~mvi componentsedu'QcsU'dvng.Neu trangcomponentkh6ngxac dinhthongtin trlnhdi€n anchor,thl thongtin trlnhdi€n m?cdinhchoanchortrong dinhnghlalopcomponentnaysedu'QcsU'dvng. 11.4-Anchor cling la component Quaphantichdtren,tatha'ym6ilopcomponentd€u codinhnghlamQts6lopanchor dungtrangph~mvi lOpcomponentdo.M6i anchorphilithuQcvaomQtlOpnaodova cothongtinngfi'nghlarieng.AnchorclingconQidungdfi'li~uriengvathongtintrlnh di€n rieng- dungd€ xacdinhvatrlnhdi€n mQtbQph~ncuacomponent.Themnfi'a, trangcompositecomponent,anchordu'QcxacdinhtITcacanchortrongcacatomic component.Nghlala tacoth€ apdvngkhaini~mcompositechoanchor,theonghla la anchortrangcompositecomponentla t~phQpcaeanchortITcacatomic omponent cuacompositecomponentdo. 32 Toml<;1ianchorcungla mQtcomponent,du'QcdinhnghiatumQtlop,cothStruyxua't tucaccomponentkhac.DodoanchornencomQtid riengvaid nayla toancvctrong h~th6ng. BieunaykhacVOlDexter.Trongmoh'inhDexter,anchordu'Qcxacdinhb~ngC?p(id component,id anchor)va id anchordu'Qcdinh nghiatu'ongd6i trongph<;1mvi componentchliaanchordo.Bieu nayd~ndencacanchord nhfi'ngcomponentkhac nhau,cothScocungid. Voi cacanchorla toanbQcomponent,neuthongtin tr'inhdi~nho?cthongtin ngfi' nghlacuachungkhacnhauth'ichungsedu'Qcxacdinhla caccomponentkhacnhau. AnchorchidentoanbQcomponentco thSla anchordanhda'uho?cla anchorkhong danhda'u.Neula anchordanhda'uchidentoanbQcomponent,h'ianchornayconQi dungla tr6ng.Neula anchorkhongdanhda'u,th'inQidungcuaanchornaycochiden toanbQcomponenthaykhong,la tuythuQcvaonQidungdu'Qcxacdinhbdi ngu'oi dungho?cdolinktruyxua'tdenanchornay. 11.5-Anchor va giaodi~nngtiOidung . VOlcacanchorngu6n(anchorcoit nha'tmQtlinkhu'ongrakhoicomponent): neu la10<;1idanhda'uth'icacanchornayluondu'QchiSnthicungVOlcomponent;neula 10<;1ikhongdanhda'uth'ingu'oidungse chQncacanchor10<;1inaythongquacac dialogbox,button,menu,... . Voi cacanchordich(anchorchico caclink hu'ongvao): chidu'QchiSnthi neu anchornayviladu'Qctruyxua'tden.Ngoaira,ngu'oidungcondu'Qclingca'ptuy chQnhiSnthiho?ckhonghiSnthita'tcacacanchordich,caccomponenttruyxua't denanchornay,... Cacanchordichco thSla 10<;1ianchorkhongdanhda'u.Vi dVtrongmQtcdsddfi'li~u quanh~,khi ngu'oidungsli'dvngpheptoanchQndSxacdinhmQtvungCIamQtt?P cacdong)trongbangthlinha't.SaildotheomQtlinkla pheptoanketn6i (join)dSdi chuySnsangbangthlibal.Ket quatinhtoancualinknayla caccQtdungtrongphep chQn.Ket quanaydu'QchuySnchoanchordich.Vi~cxacdinhvi tri cuaanchornay du'Qctienhanhb~ngcachdungpheptoanchieu.R6 rangtrongtru'onghQpanchor dichla10<;1ikhongdanhda'u,vi tricuaanchorchidu'Qcxacdinhvaoluctruyxua'theo link. .. III. Compositecomponent Mo hlnhAmsterdamthvccha'tlamohlnhDextercothemmQts6b6sungdvatren cacyellc~ucuah~th6nghypermedial cachdinhthaigianchocaccomponentla mediava m6i quanh~tr'inhdi~ngifi'acac componenttrongmQtcomposite component. .. 33 Tuy v~y,va'nded~tra la li~ucacb6sungnaycobaaquatmQitrinhdi€n co th€ co haykhong?Vi d\,l,trinhdi€n yell cguchi th11chi~nmQtphgncuamediava l~pl<;1i lient\,lcchode'nkhicuQnquahe'tmQtcomponentvanbankhac. TrongmohlnhAmsterdam,compositecomponentkhongchU'anQidungdfi'li~utrlnh di~nmachihill trfi'cacm6ilienh~thaigiangifi'acaccomponentconvam6ilienh~ thaigiangiii'acomponentcha-componentcon.Nhu'ngnhu'v~y,mohlnhnaydiicU'ng hoavi~ct<;10mQtrinhdi€n ti1'caccomponent. Ti1'quandi€m h~th6ngmdtrongmohlnhDexter,ta se tachcd che't6nghQpcac componentt<;10ratrinhdi~nthanhmQtlopdu'Qcd~td tftngbell trong.Tu'dngt\fnhu' component,vi~cdinhnghlamQtlopcompositecomponentse donhii'ngngu'aiphat tri€n richhQpvaoh~th6ng. B~ngcachdu'acdche't6nghQpcaccomponentthanhtrinhdi~nvaolop dinhnghla compositecomponent,vi~cdieu khi€n s11trinh di€n cac componentcon trong compositetrdnendad<;1ng,linhho<;1thdn;khongchiconla mQt"mftu"duynha'tdo h~th6ngapd~tnhu'trongmohlnhAmsterdam.Nhu'v~y,khikichho<;1tmQtlinktrong compositecomponent,caccomponentconnaotie'pt\,lctrlnhdi~n,ngu'ngl<;1i,haybie'n ma'tlados11dieukhi€n cuacompositecomponent. Voi ca'utrucnay,compositecomponentsekhongcodii'li~u(trinhdi€n), machico thongtin ngii'nghla,thongtin trinhdi€n (chocaccomponentcon),danhsachcac componentthanhphgnvadanhsachcacanchor.Ti1'thongtinngfi'nghla,h~th6ngxac dinhdu'Qclopdinhnghlacompositecomponentnayvasedungthongtin trinhdi€n dinhnghlatrongcomposited€ th\fchi~nvi~ctrinhdi~ncaccomponentcon,trong compositedo.Cacanchortrongcompositecomponentdu'Qcdinhnghlala t~panchor ti1'cacatomic omponenttrongcompositecomponentdo. Vi d\,lt<;1omQtcompositecomponentlamQtdanhsachcacth\fcv~ts6ngdu'Qctrongsa m<;1c.Compositecomponentseg6mt~pcaccomponentth11Cv~ts6ngtrongsam<;1c. Lopdinhnghlacompositesexacdinhvi~ctrinhdi€n cactenth11cv~thanhmQtdanh sach,voicacthanhphgntrongdanhsachdu'Qcla'yti1'tencuacaccomponentcon. Compositecomponentlu'ucacthongtintrlnhdi~nla mallchfi',mallnell,kichthu'oc vavi tri cd'as6,ki€u vacochfi',...nhu'ngnQi dungcua compositela rang, nghlala khonglu'utencuaba'tkycomponentconnaGtru'oc. Khi du'Qcyell du trinhdi€n, compositecomponentse n<;1ptencuacaccomponent thanhphgnvaocomponentlistbox.Vi~cbi€u di€n cacth\fCv~ts6ngtrongsam<;1cse docomponentlistboxth\fchit$n. 34 Compositecomponent List box Danhsachcac componentcon Tencomponent1 Tencomponent2 cKutruccomposite Trinh dieDcomposite mnh 12-ctu trucvas1/.trlnhdi~ncompositecomponent Vi~cdu'adinhnghIacompositecomponentvaothanhphgnbell trongdalamchoh~ thdngcokhanangchopheptichhQpmQitrlnhdi€n coth€ comakhonglamphuct?P themmohlnh.Khi do,cachthuct6nghQpcactrlnhdi€n thanhmQtrlnhdi€n Ionhdn trongmohinhAmsterdamsetrdthanhmQtlopdu'QcdinhnghIatungoaivadu'QCtich h9Pvaotc1ngbelltrongcuamohinhmaio Ngoaifa,khaini~mkenhtrlnhdi€n sekhongconcc1nthiel,VI : . M6i component,k€ eacompositecomponent,delidu'QcdinhnghIathanhmQtlop. Trong dinh nghIalop da xac dinh thongtin trinh di€n mi;lcdinh cho cac component- la mQthinhthuckhaccuakhaini~mnhomcackenhtrlnhdi€n thanh mQtlayoutnhu'trongmohinhAmsterdam. . Vi~cki€m tra sv quatai tai nguyencling do lop dinh nghIacompositechili trach nhi~m.M6i loptvxacdinhcc1nhii'nglo?icomponentconnaotrongtrlnhdi€n, tu dococachki€m traquataitainguyenthichhQp. IV- Anchor trongcompositecomponent NeulopdinhnghIacompositecomponentkhongxacdinhro,thltrongtru'ongh9Pcac anchortrongcompositecogiaokhacr6ngvoinhau,taxemxetcactru'ongh9Psail: . Khi caccomponentcoquailh~t6 lien voi nhau,tatheonguyendc u'ulien cho cacthongtinearnngii'eanhhdncacthongtinphingii'eanh.Tuy V?y,composite componentv~ncoth€ di;ltl?i thutvu'uliennay. Tronghinhsail,cacanchorcuacomponent3 vacomponent4 cophgngiaolacac anchortrongcomponent5. Vi component4 va component5 dangdu'Qckich ho?t trongph?mvi component3,nenngii'eanhtrongtru'onghQpnayla component3.Khi ngu'oidungchQnvaophgngiaola mQtanchortrongcomponent5, thl anchorcua component3du'Qcu'ulienhdn. 35 ~......... ,i u uu {- / 8 \ 3] . i,/! \ 'l/ ~ sX/i 0 atomiccomponent- 8 compositecomponent ----- Hinh 13-811giaonhaucuacacanchortrongnhungcomponent coquailh~t6 tieDvOinhau . Khi caccomponentkh6ngcoquanht%t6tienvdinhau,compositecomponentphih xacdinhcacanchorcogiaovdivungdu'QchQnvahoingu'oidungchQnanchor naotrangs6do.Tranghlnhsau,cacanchorcuacomponent2 vacomponent4 co phcingiaola mQtanchortrongatomiccomponent5,Ngu'oidungphilixacdinhla hQchQnanchorthuQcomponent2 haycomponent4. 'A-" -',,: :, 0, 0 \) : 83 / :"-/--/\ 0 " "' / 4: 8 , " 0 ~ ... : :/ ", .:" ',' " " :: 0: ,: 0 0 5 0,': .. ,,',' : ', ',-' 0-------- Hinh 14-811giaonhaucuacacanchortrongnhung componentkh(')ngcoquailh~t6 tieDvOinhau 36 V-Link V.I- Link vaanchorkh6ngdanhd«u TheomohlnhDexter,linkbaog6mmQtdaycuahaihaynhi€u d§un6ivalinkduQc kichho(;ltsethl;l'chit?nquatrlnhchQnra mQthoiflcnhi€u anchordichtucacd§un6i TO cualinknay. v.l.l- Ljnk tinhtoaDxaca/nhn(Jjdunganchoraich Theosl;l'phanrichtrongchuang2.1.7-Anchor,vi tri anchorkhongdaubda'uchiduQc xacdinhthongquamQts6tinhroan.VI V?y,khidi dQctheomQtlinkd€ troyxua'tde'n cacanchorkhongdaubda'u,linknayphaixacdinhnQidungcuaanchordichtucac thongso'cuaanchorngu6n.Dodolinkconla mQtie'ntrlnhxacdinhnQidunganchor dich. V.1.2-Ljnk tfnhtoaDxac a/nhjd cuaanchoraich Khi Dextercha'pnh?nlinktinhroanvaanchorkhongdaubda'u,dad~nde'nht?quala conhii'nglinkconhii'ngd§un6iTO khongcoid anchor.Khi componentkichho(;ltlink vatruy€nthongso',linkco th€ dl;l'atrenthongso'naymachQnfa id componentdich vakichhO(;ltcomponentdo. id anchordich=idanchor Hlnh 15-Ddunolkhongxacdinhtructcid V.2- C«u truc cualink component VI linklamQtie'ntrlnhxU'ly nenlinksekhongcothongtintrlnhdi~n.Clingtuang W'nhucaccomponentkhac,cacloplinknaylamQthanhph§nngoaiht?th6ng,thuQc 37 Linkcomponent Textcomponent Anchorkhongdanhdffu Khongcoid Thongtintrlnhdin HuangFROM Khongcoid I HuangTO vaot~nghentrong,nenchungcotheduqcb6sung,suad6iba'tky lucnaomakhong anhhuangde'nh~th6ng. Khaini~mcompositevaanchorclingkhongapdl,lllgchocaclinkcomponent.Nhudi'i trlnhbay trongchuang3.11.3-Thongtin trlnhdi~nanchor,d~un6i se khongchli'a thongtin trlnhdi~nanchor.D~un6i se chi baog6mid cuaanchorcomponentva huang. Vi~cd~un6ichichli'aid cuaanchorcomponentcondfinde'nmQti~nlqi khac.Trong mohlnhDexter,khikichho~tmQtcomponentb~ngdongl~nh,nguoidungphaicho bie'tencomponent(h~th6ngseHmduqcid tuangli'ngcuacomponent);conkhikich ho~tcomponentdQctheolink,h~th6ngphaibie'tid componentva id anchor(trong componentdo).Khi xemanchorla component,hl trongca hai tru'onghqp- b~ng dongl~nhhaydQctheomQtlink- h~th6ngchidn bie'ten(ho~cid)component.Khi anchorcomponentduqckichho~thlh~th6ngseHmduqcvakichho~tcomponent tuangli'ngchli'aanchordo. ffmh 16-Vi d1)v~linkcomponent Link duQct~ob~ngbQso~nthaolink.NguoidungchQncacanchorngu6n,anchor dich.H~th6ngsehienthicacloplink thichhQp.NguoidungsechQnmQtlop link, d~tenvaxacdinhcacthongso'(t~othanhnQidung)cholinkvilat~o. 38 ComponentA ComponentB Anchora Anchorb ThOngtintrlnhdin ThOngtintrlnhdin Link component Id anchora HuangFROM Id anchorb HuangTO V.3- Cae link khongeh~t Ngu'Qcl(;livdimohinhDexter,Halasz[2]du'aracac19doh6trQlinkthongch?t: . Chopheptrlhoanvii$cciflpnhifltvathudci)llracsailcacthaotacxoacomponentva anchor.Di€u naylac6ichkhi linkdn du'Qcxoahaythayd6idangn~mtrenmQtmay khachaydangbikhoaboimQtngu'oidungkhac. . C6 ichtrangcactlnhhuo'ngmadfi'lii$ucuacomponentn~mngoaisvdi€u khien cuahi$tho'ng.Nghlala khi dfi'lii$ucuacomponentdu'Qclu'utrongcactiflptin rieng bii$tvacactiflptinnayc6thebi xoahaybi doichuyen. . Cacdguno'i(chiVaGanchorhaycomponentvuabi xoa)c6thedu'QCd?ttroVaG mQtcomponenthaymQtanchornaGkhacmathongdn phaica'utrucl(;litoanbQlink. . Caclinkthongch?tdu'Qco'tinht(;lOradedanhch6chocacnutho?cdiemneoa dguno'icualink,macacnutho?canchornayv~nconchu'adu'Qct(;lOfa. ClingtheoHalasz,Svhii$ndii$ncuacaclinkthongch?tnhu'viflydu'Qcgiamsatboihi$ tho'ng- ho?cb~ngli$nhho?cdu'Qcthvchii$ntvdQng.Ngu'oidungsedu'Qcnh~cno'il(;li cacdguno'ibi "tha'tl(;lc"cualink. C6 4 tlnhhuo'ngv€ link thongch?tnaysinhtrangmQthi$hypertextxaydvngtheo mohinhDexter: 1)Caccomponentadguno'icualinkdabixoa. 2)Anchormalinkthamchie'uWidabi xoa. 3) Cacdo'itu'Qngdfi'lii$udu'QcnQidungcuacomponentthamchie'uWi la thongsli' dl,lllgdu'Qc. 4)GiatrianchorthonghQpli$. Tranghaitru'onghQpdgutien,cacthaotacxoalamthayd6icacdo'itu'Qngdich;d~n tdivii$cnhfi'ng19ntruyxua'tsaild6bi lo(;litIll. Hai tru'onghQpsailthu'ongla ke'tquacuacacthaotaca ngoaisvdi€u khi€n cuahi$ tho'ng.Vi dv, cacdo'itu'Qngdfi'lii$ulamnQidungcuacuacomponentse tro nen thongdungdu'Qcne'unQidungcuacomponentla tentiflptinvatiflptinnaydabi di chuy€nhaybi xoa(tru'onghQp3). Trangtru'onghQp4,dfi'lii$udu'QcxacdinhboinQidunganchortronenthonghQpli$ khi cacphgnlienquancuacomponentdabi thayd6ib~ngcacbQso(;lnthaoa ngoai hi$tho'ng.N6i chungthltlnhhuo'ngnayla thongthephathii$ndu'QC,VIcacanchorc6 thev~nla hQpli$.Vi dVkhi componentla textvaanchorla mQtdo(;lnvan.Ne'unQi dungtext bi thayd6i boi mQtbQ so(;lnthaoa ngoaihi$tho'ng,thl anchorcua componentnayv~nc6thexacdinhdungd~nmQtdo(;lnvantrangtextd6- nhu'ngnQi dungtexttrangvungxacdinhboianchorlahoantoanthayd6i. Hannfi'a,cac19Ie cho'ngl(;liHalaszconla : 39 . Co nencha'pnh?nst{trlhoanvi~cC?pnh?tvadQnnk haykhong?Dieunaycon ph'QthuQcvaovi~cph<ittrienngonnguhotvacacrangbuQctrenHMDB. Cacthaotacxoa,dichuy€ncaccomponentduQchfutrongcact?Ptinriengcothe duQCnganch~nbAngcaccdche'cuah~di€u hanh.Vi~csli'ad6icomponentchI du<;1ctie'nhanhbAngcaclingd'Qngcoh6trQchoHMDB. Vi~cxoacaccomponentphiiituanthuch~tchetheothlitt{:xoalink,xoaanchor, vasailcunglaxoacomponent. . . V.4-Link dim ngiicanh Mo hlnhVilas- SatidSingkorapoomduarakhatni~mlienke'tearnngudmhnhung chideh6trQchomQtlo~itrlnhdi€n d~cbi~tla l~nluQthienthicacthongtinthliye'u ph'QthuQcvaod~ngdanhsachcuathongtinchuye'u.TrongmohlnhVilas - Satid khongcokhatni~manchor. Mo hlnhAmsterdamduarakhatni~mngueanhcualink, la nhungcomponentcon trongcompositebi anhhuangkhi linknayduQckichho~t. (j day,tasecattie'nmohlnhDexterbAngcachdungkhatni~mlinkearnngucanh. Link earnngueanhla link chi t6nt~itrongph~mvi mQtcompositecomponent. Nhunglinklo~inaylakhongtha'yduQctircaccomponentkhac. Khai ni~mlink earnngucanhcungVOlvi~cdinhnghlal~icompositecomponent (xemIII-Compositecomponent)nh~mh6trQchovi~ct6nghQpcaccomponentthanh mQttrlnhdi€n. Link camngucanhclingca'pst{lienh~giuacaccomponenttrong ph~mvi composite.Cdche't6nghQptrongdinhnghlalopcompositethlxacdinhcach thlictrlnhdi€n cacnQidungla'ytircaccomponentcon. Tadn lu'uy st{khacnhaugiuacackhatni~mngucanh. . "Ngucanh"trongmohlnhAmsterdamla t?Pcaccomponenttrongca'utrucdiy phanca'pvacaccomponentnayamliccaohdncomponentcolinkduQchQil . "Ngucanh"trongmohlnhVilas-Satidla thanhph~ncuacompositenodedang duQckichho~t. . "Ngueanh"duQcxetadaylat?Pcaccomponentconcuacompositenode Vi d'Qcompositecomponentg6mcomponentla mQtdo~nvideoduQcph'Qdeb~ng mQtcomponentla mQtdo~ntext.Giuahatcomponentnayco linkke'tn6ichungVOl nhau.Linkke'tn6igiuachungchitha'yduQctrongph~mvi cuacompositecomponent. Khi trlnhdi€n chungdQcl?pho~ctrlnhdi€n trongph~mvi mQtcompositecomponent khac,st{ke'tn6igiuacomponentvideovacomponenttexttrensekhongKayfa. 40 Video Van ban ......................................................... 1llliliilii:lillllilillllllliiiillllllillllllliillllllIIIIIIII Componentvideo " " "",." "................................................................................................... - Componenttext Hinh 17-CaccomponentdQcl~p Video Vanban Hinh 18-Caccomponentrongph~mvi composite 41 V .5-Chi~udai media TrangmahlnhAmsterdam,cachdinhthaigianchocaccomponentIii mediavii m6i quailh<$trlnhdi~ngifi'acaccomponentdu'Qcxacdinhb~ngcacclingd6ngbe)trang compositecomponent.Cacclingd6ngbe)dinhnghlam6ilienh<$thaigiand d<;1ngcac khoangthaigiantr~t6ithieuvii t6idagifi'acackhoangtrlnhdi~ncuacaccomponent media. Xemm6ilienh<$thaigiangifi'ahaicomponentmediasail: Thaigian . I!!!!!m!!!!!!!!!!!mm!!!!t::ii:@gmmmmmmmmmmmmmmCo ponent1 Anchor Component2 llinh 19-Lien h~thO'igiangiii'acaemedia Tronghlnhtren,sailkhi component1 trlnhdi~ndu'Qc30giaythl component2 b~t dc1utrlnhdi~n.Tuy V?y,va'nde nay sinh Iii khi ngu'aidungyeti cc1utrlnhdi~n component1d t6cde)nhanhga'pdaithldieucothexayra Iii component1dacha'm dlitr6i thlcomponent2 moitrlnhdi~n.Trangthvcte',vi<$cxacdinhcomponent2 b~t dc1utrlnhdi~nkhicomponent1trlnhdi~nde'nme)tdo<;1nniiodosehQpIy hdnIii vi<$c xacdinhcomponent2 b~tdc1utrlnhdi~nkhi component1 trlnhdi~ndu'Qcme)thai gianniiodo. Nhu'V?y,ta co thethaythe'khaini<$mthaigiantrlnhdi~nmediab~ngkhaini~m chieudiii media.ChieudiiimediaIii khaini~mdungdeIu'Qnghoasvtrlnhdi~ncua mediado.Vi d\!,voimediaIii videothlchieudiiimediadu'Qctinhb~ngso'frame;voi mediaIii amthanhthlchieudaimediasetinhb~ngthaigiantrlnhdi~ntheoddnvi giayd t6cde)thu'angcuat?Ptinamthanhdo. 42 Cae ddnvi dil'li<%utrongmedia . Component1 Component2 ffinh 20-Lien h~giiiacaemediatheochi~udid Voi khaini~mchieudaimedia,m6iquailh~trlnhdi€n giuacacmediasekhangphi). thuQcvaot6cdQtrlnhdi€n cuaph§nclingho~cvaovi~cchQnchedQthtfchi~ntrlnh di€n nhanhhaych~m. ThaychocacclingdangbQ,tadinhnghlathemmQtlOpanchord~cbi~tchocaclop media.Lop anchornayxacdinhmQtdol;lntrenchieudaimedia.Vi di).mediala video cochieudaila 50frame,thlco thecomQtanchorthaigianla khoang(20,30)ch~ng hl;ln.Nghlala trongkhoangtueanh20deneanh30cuatrlnhdi€n, nguaidungchQn anchortrencomponentvasekfchhol;ltcaclinknaodoxua'tphMtu anchornay.Chli y lad day,nguaidungco thechQnanchorthaigianthongquamQtphuongti~nnao donhubuttonch~nghl;ln. B~ngcachthemkhaini~mlinkcamngueanhvakhaini~mchieudaimediavaoma hlnhDexter,ta co thetl;lOra cackhanangdangbQthaigiangiuacaecomponent medianhutrongmahlnhAmsterdam.ClingdangbQgiua2 componenttrongmQt composite(trongmahlnhAmsterdam)setuongduongnhumQtlink earnngueanh giua2 componentdovacocacd§un6itrodencacanchorthaigian. Tuy nhien,docompositekhangconQidungriengnenkhangthecocacanchorthai giantrencomposite.Dieunaydfindenvi~ckhangthedinhthaigiantrlnhdi€n cho caccomponentcontrongcompositeb~ngkhaini~mchieudaimedia. Nhudatrlnhbaytrongchuang3.III, compositecomponentclingla mQtthanhph§n duQcdinhnghlatungoaivaduQcd~td thanhph§nbelltrongcuah~th6ng.Tu do,ta co thegiai quyetva'ndedinhthaigiantrlnhdi€n chocaccomponentconb~ngcac cachsail: . Do thaigiantrlnhdi€n caccomponentconluanduQcxacdinhke tu llic biitdc1u trlnh di€n composite.Han nua, thai diem trlnh di€n componentcon trong 43 .compositeladQcli;lp,khongpht;lthuQcho~canhhuangde'nba'tky componentcon naokhactrongcomposite.Taco thexemthongtinnaynhula mQthongtintrlnh di€n cuacomposite.Nhungcachnaykhongthui;lnti<$nkhi thayd6i tdcdQtrlnh di€n compositecomponent. Co thedungmQtmedialamnSnxuyensudtst;l'trlnhdi€n composite.Thai gian trlnhdi€n caccomponentconkhacduQcxacdinhtheocacanchortrenmedianSn nay.De khonganhhuangde'nst;l'trlnhdi€n cuacaccomponentconkhac,media nSnco thela mQtcomponentamthanhkhongtie'ng,ho~cmQtcomponentvideo cota'tcaframedSulacach'inhtrongsudt. Cbudng4-Mo blnbDextercaititn I- Din nhJjp Cackhaosatv~anchor,link,compositecomponenttrongchuang3 nh~mmvcdich lamro bonnhit$mvv vaca'utruccuachung.DV'atrencosacackhaosatd6,mQts6 thayd5i trenmohlnhDexterdu<;fcd~xua'tnh~mxacd8inhro chucnangcuatung thanhph§ntronght$th6ngvalamchoht$th6ngc6khanangmarQngnhi~ubon. II- De'xufitcaethaydo]trongmohinhDexter 11.1-Tfnhmdcuah~th6ng: MQttrongnhfi'ngdi€m m(;lnhcuamohlnhDexterla tinhmacuamohlnhnay.VI V?y mohlnhd~xua'tv~ngifi'l(;licacca'utrucchuye'ucuamohlnhDexter.Cacdi€m thay d5i trongmohlnhmoiclingla nh~mvitomvcdichtangtinhmacuaht$th6ng;cac thayd5id6la : . Anchorla componentvac6tenrieng,id rieng.NQidunganchorla cacthongtin xac dinhmQtbQph?ncuacomponent.Thongtin trlnhdi~ncua anchordU<;fc componentsu dvngd€ hi€n thi anchord6.Do anchorclingla component,nen dinhnghiachocaclOpanchordU<;fcduavitot§ngbentrong. . ClingnhuDexter,link la componentva c6hai lo(;lila link cd dinhva link tinh loan.Tuy nhiend€ lamcho link dQcl?p voi anchor,cacthongtin trlnhdi~n anchorthayVI du<;fcd?ttrongd§undicualink component,hl trongmohlnhd~ xua't,chungdu<;fcd?ttronganchorcomponent. . Khongc6 khai nit$mcompositeva anchorcholink component.Khongc6 khai nit$manchorchoanchorcomponent. Quavit$ckhaosatchitie'tcackhainit$manchorva link trongchuang3, mohlnhd~ xua'tchotha'ykhongchi link maca anchorclingdU<;fcxemla componenttronght$ th6ng.Khi mQithanhph§nd~ula component,§nglu'utrfi'cuamohlnhmoisechi hoanloanchuacaccomponent.T§ngbentrongla naid€ nhfi'ngnguoiphattri€n ht$ th6ngtichh<;fpcaclo(;licomponentmojo 11.2-Kha nangbi€u di~nvalienke'tdil li~ucuamhlnhd~x~t : . Cd che't5ngh<;fpcompositecomponentdu<;fcdinh ngh'iathanhmQtlOpva du<;fca t§ngbentrong.Compositecomponentc6thongtinngfi'ngh'ia,thongtintrlnhdi~n, 45 .nhungkhongco nQidung.NQidungtrlnhdi~ncuacompositeduQcla'ytITcac componentcon. B€ mdrQngsvtrlnhdi~ncaccomponent,cohai10<;1ianchorduQcde nghi: 10<;1i danhda'uvakhongdanhda'u.Anchorkhongdanhda'uconQidungxacdinhbdi cacthongso'tungoaigti'iden.Cungvoikhaini~manchorkhongdanhda'u,vi~c truyenbienvanh~nketquatrongcaclink tinhtoanclingduQcde nghi.Khi di dQCtheolinkd€ troyxua'tmQtcomponent,linknayconcoth€ clingca'pcacthong so'(neuco)d€ componentxacdinhvi tricuaanchordich. B€ h6trQchovi~cchovi~cph6ihQptrlnhdi~ncaccomponenttrongcomposite, khaini~mlinkearnngueanhduQcsti'dtJ.ngtrongmohlnhdexua't.Link camngu eanhla link chi tan t<;1itrongph<;1mvi mQtcompositecomponent.Cung cac component,nhungtrongcaecompositekhacnhauthlstftrlnhdi~nsekhacnhau. CompositecomponentduQcxemla tieDtrlnhdungthongtintrlnhdi~nvacaclink earnngueanhd€ dieuph6ivi~cthtfchi~ntrlnhdi~n. Khai ni~mchiendai mediaduQcde nghidungthaycho thai giantrlnhdi~n media.Voi khaini~mnay,takhongphaiduathemyeuto'thaigianvaomohlnh mav§nt<;10duQcstfdangbQgiuacacmedia. . . III- Caethanhphli'neuamohinh mnh21-C«utrucatomicomponent NQidung MQtatomic omponentcocacthanhphffnsail: . NQidung:laduli~ud€ trlnhdi~n. . Thongtin ngfi'nghia: motangunghiacuacomponentnay.Thongtinngunghla duQcdungd~xacdinhlopdinhnghlacomponentnay.Chungclingco th~dung d~suyrathongtintrlnhdi~nm?cdinhcuacomponentdo. . Thong tin tr'inhdi~n: la cacthongtin cholop dinhnghlacomponentbitt phudng thti'ctrlnhdi~nnQidungcuano.Neu thongtin trlnhdi~nkhongduQcxacdinh 46 tuongminh,h~th6ngse Iffyd.c thongtin trlnhdi~nmi[lcdinhduQcsuyra tu thongtinngil'nghla. Cac id anchor:xacdinhcacanchortrennQidungcomponent.. mnh 22-GIU truccompositecomponent MQtcompositecomponentcocacthanhph<1nsail: . Thongtin ngii'nghia:motelngil'nghlacuacomponent.Thongtinngil'nghladuQc dungdexacdinhlopdinhnghlacomponentnay. . Thongtin trlnh di~n: la cacthongtincholopdinhnghlacompositecomponent bie'tphuongthU'ctrlnhdi~nnQidungIffytucaccomponentcon.Ne'uthongtin trlnhdi~nkhongduQcxacdinhtuongminh,h~th6ngse Iffycacthongtin trlnh di~nmi[lcdinhduQcsuyratuthongtinngil'nghla. Cac id anchor:xacdinhcacanchortrencompositecomponent.. mnh23-Glu truclink component 47 MQtlinkcomponentcocacthanhph~nsail: . NQi dung: la ti;lpcac thong s6. Tie'n trlnh dU9Cxac dinh tu lOp dinh nghla componentsechQncacanchorhuangratheoti;lpcacthongs6nayvacacthongs6 duQcclingca'ptuanchorngu6n. . Thongtin ngunghia :motangunghlacuacomponentnay. . D§u nol : la mQtbQ(idanchor,huang)dungdexacdinhhuangcuaanchortrong link. HInh 24-C3'utruc anchor component MQtanchorcomponentcocacthanhph~nsail: . NQidung: la cacthongtindexacdinhmQtvungduli~utrongnQidungcua componentchuaanchornay. . Thongtinngunghia : motangil'nghlacuaanchornay.Chungcothedungde suyrathongtintrlnhdi€n m?cdinhcuaanchordo. . Thongtin tr'inhdi~n: motacachthucmacomponentbienthianchor.Ne'uthong tinnaykhongduQcxacdinhtuongminh,h~th6ngsela'ycacthongtintrlnhdi€n m?c dinh duQcd?t trong thongtin trlnh di€n cua component.Ne'u trong componentvfinkhongxacdinhthongtin trlnhdi€n choanchor,h~th6ngseH1Y thongtintrlnhdi€n tronglapdinhnghlaanchor.Lap dinhnghlaanchorduQccho khidinhnghlalOpchocomonentnay. Anchorcompositela ti;lpcac anchorla'y tu cac atomiccomponentrongmQt compositecomponent. 48 IV- Kitn trueh~thffngCSDL hypermediatheomohinheai 0"'"tIen T~ngth\l'chi~n Hinh25-Kie'ntrueh~th6ngCSDLhypermedia Tgnghill tril'chliacacatomiccomponent,compositecomponent,anchorcomponent valinkcomponent.Tgngnaychilamnhi<$mvvlu'utmcaccomponentmakhongbi€t d€n dIu trucvacacthaotacdu'QcdinhnghlaireDcomponent. Tgngbell trangla ndidinhnghlaca'utrucvacachanhvi trencacd6itu'Qngdil'li<$u. Nhil'ngngu'oiph<ittri€nh<$th6ngc6th€ richhQpcaclOpdinhnghlacacki€u dil'li<$u moihoi;icaclopcompositesadvngcaclopc6sand€ dinhnghlamQtrlnhdi~n. Tgngthtfchi<$nla caclingdvngcvth€. Caclingdvngnaytruyxua'tcaccomponent trangtgnglu'utril',trlnhdi~ncaccomponentnay,dangbQchungvoi nhau,ph6ihQp chungthanhmQttrlnhdi~n,t(;10quatrlnhtu'dngtacvoi ngu'oidung,...thongquacac hanhvi du'Qcdinhnghlasanchocaccomponentd6d tgngbelltrang. Chu'dog5 : M{)ts6cai dijt chii ye'utroogmohloh HMDB Co nhieuky thu~tbill till vatroyxua'td11li~u.Do'ivoi d11li~ula cacd1,mg media,vi~chill till vatroyxua'thuangdoh~dieuhanhdamnhi~m.Do'i voi cacd1,mgd11li~ukhac,cacky thu~thaydungladiy canb~ngvabang barn.Cay canb~ngthu~nti~ncho vi~cc~pnh~tnhunggay langphi khonggianilia.Bangbarndu<;1cuadungkhikichthuocCSDL co theuoc lu<;1ngdU<;1c. Phgnnayde xua'tmQtthu~toancaid~tchotgnghill till trangmohlnh Dexterclli ti€n. Thu~toannaykhongdoihoiphaiuoclu<;1ngWac kich thuocCSDL vaclingkhonggaylangphikhonggianl@ till. Tuyv~y,gia phaitrala thaigiantroyxua't.TrangmQtchungmvckhongyell du cao veto'cdQtroyxua't,thu~ttoannayladungdu<;1c. Ngoaira,vi~cbaadamSvantoand11li~uclingdu<;1cquantam.Phgnnay clingdenghimQthu~ttoankhoipht;lcd11li~ukhicoSvco'voimQtso'h~n ch€ trongh~tho'ngHMDB. , I - Cili d~t tangIda trO 1.1-Dijt va'od~ D€ quailly ilia cling,cach~dieuhanhluonphanilia clingthanhcacddnvi nhoco kichthu'dcb?ingnhau.Khi lu'utill mQtt~ptin,h~dieuhanhsetie'nhanhcaccong vi~csau: . Ki€m tras6cacddnvicontr6ng. . Ne'ut6ngdungIu'Qngcontr6ngkhongdud€ lu'ut~ptintn3n,h~dieuhanhbao16i. . Uiy mQts6ddnvi conttfdovdit6ngkichthu'dcdud€ lu'utill t~ptintren,vaghi nQidungt~ptinlencacddnvi do. . Ghithongtinnhomcacddnvi nayvaovungquailly ilia. . Danhda'udaslYdvngcacddnvitren. Va'ndenaysinhla ne'uchQnkichthu'dchom6iddnvi quanho,s6cacddnvi dung chomQtt~ptinsetanglenvalamgiamt6cdQtroyxua'tt~ptin.Dieunaycangtrd nendangk€ hdnd6ivdicact~ptinWn.Ngu'Qcl(;li,ne'uchQnkichthu'dchom6iddn vi quaWnsedftnde'nlangphi iliaclingdokhongslYdvnghe'tkhananglu'utill cua mQtddnvi. Va'nde tu'dngttfclingxayratrongcach~HMDB co tuhangchvcngancomponent trd len. Da s6 cac componentla d d(;lngtext.Theo th6ngke cuaMullenderva Tannenbaum[3],trongmffuthlY19978t~ptind(;lngtext,khoang85%cokichthu'dc nhohdn8K va48%nhohdnlK. Nhu'v~yne'um6icomponentdu'Qclu'uthanhmQt t~ptinriengbi~tvam6iddnvi trencacilia clinghi~nnaycokichthu'dct6i thi€u la 4K - thIlu'Qngiliaclingbi langphilara'tWn. TrongHMDB, yetidu chuye'ud6ivdi h~lu'utn1'caccomponentla tranhlangphi khonggianilia.VI ngu'aidungthu'angchitroyxua'tungcomponentvangaycavdi mQtcompositecomponentthlso'caccomponentthanhph§ndu'Qctroyxua'tclinghic clingkhongphaiIa quaWn;VI v~yyetidu ve thaigiantroyxua'tmQtcomponent du'QcgiamnhytrongHMDB. 1.2-Philo tich Doh~dieuhanhluonclingca'pcacWigQih~th6ng(systemcall)vecacthaotact~p tinnhu'create,open,close,read,write,seek,changesize,nencaclingdvngslYdvng t~ptin nhu'mQtthungchliamakhongdn bie'tde'ncdche'ca'pphatkhonggianilia cuah~dieuhanh.Nhu'v~yva'ndeco thequythanhla tadangcomQt"thungchlia" vdi dungIu'Qngt6idala khonggianiliacontr6ng,haytlmcachslYdvngthungchlia naymQtcacht6tnha't. 51 1)Tu'ongtv nhu'cachquan19ilia cuah~di~uh~mh,taclingsetl;locoche'dip phcit kh6nggianhilltrUtheotungdonvi. Gia Sllcaccomponentcocungkichthu'ocL, tasechQndonvi lu'utrlldu'QcdIp phcit cokichthu'ocdungb~ngL. Khi themmQtcomponent,asethemcomponentnayvito cu6it~ptinlu'utrU.Khi xoamQtcomponent,hldetranhvi~cxua'thi~nkhoangtr6ng trongt~ptinlu'utrU,tadungcomponentd cu6idela'pvito16h6ngnay.ffinhsauminh hOI;lvi~cxoamQtcomponent. Xoacomponent thUi Tru'ockhixoa Saukhi xoa mnh 26-Xmicomponentvmdi~uki~nmQicomponentcocungkichthliUc Khi caccomponentcokichthu'ockhacnhau,ro rangvi~cca'pphcitnhu'lIen sedlin de'nvi~cxua'thi~nngaycangnhi~ucaekhoangtr6ngtrongt~ptinlu'utrUtrongqua trlnhc~pnh~tHMDB. Nhu'v~y,thayVIca'pphcitcacdonvi cokichthu'ocb~ngnhau,taseca'pphcitcacdon vi cokichthu'ockhacnhau.Uudiemcuacachca'pphcitcacdonvi cokichthu'ocb~ng nhaula t~ndvngdu'Qckh6nggianilia.Nhu'ngdi~unayyell c§ucacdonvi lu'utill phaicungthuQcvitomQtt~ptin.Noi cachkhac,dedungcacdonvi lu'utill cokich thu'ockhacnhau,taphaidungnhi~ut~ptinkhacnhau. 2) Kichthu'ocdonvi lu'utill Ne'udelu'umQtcomponent,adungmQtdonvi lu'utrUc6kichthu'ocb~ngdungkich thu'oc uacomponentd6;thlkhi lu'utill N componentc6 kichthu'ockhacnhau,ta 52 1 2 ........................ i .. ........ n-l n 1 2 ....................... n ........ .. n-l clingphiHdungN ddnvi hill trfi'c6kichthuockhacnhauvasU'd~ngN t~ptin.H~u quala sec6quanhieut~ptinlUlltrii'.Voi caccomponentc6kichthuoctITvaicht;lc bytede'nhangcht;lcKb,hoi[lchdnnua,thls6t~ptinlUlltrii'sera'tIon. B€ giams6t~ptinlUlltrii',tachQncacddnvi lUlltrii'labQicuamQtkichthuocnaod6 VI. Componentc6kichthuocM seduQCtachthanh M =[MlUd*VI +DI =MI +DI Ph~nduDI l~iduQclUlltie'ptrencacddnvi lUlltrula bQicuamQtkichthuocnaod6 Vz. DI =[DllUz]*Vz+Dz=Mz+Dz Tie'pwcnhuv~y,tac6 M =MI +Mz +...+Mn trongd6 MI> Mz >...>Mn Ph~nconl~ic6kichthuocnhonha'tMnseduQclUlltrongmQt~ptinlUlltrii'rieng. Vi dt;l: voi VI =8Kb,Vz=2Kb,V3=lKb; mffutinc6kichthuoc53KbseduQCtach thanh 6*8 +2*2 + 1 3) LUlltrucacmffutinc6kichthuocdunho« L) Do kichthuoccacmffutinkhacnhau,nenvi~cxua'thi~nnhungkhoangtr6ngtrong t~ptin lUll trii'la dieukhongth€ tranhkhoi.Va'nde la faHmcachkh6ngch{luQng cackhoangtr6nglangphid mltcmongmu6n. Nh~nxet: ne'utadungmQtthungchltad€ dvngnuocthlhi~usua'tsU'dt;lngthungla 100%.Hi~usua'tsU'dt;lngthungsegiamne'utadvngcat.Va hi~usua'tse tha'phdn nua ne'uta dvng soi. LUll y tha'yhi~usua'tsU'dt;lngthungti l~nghichvoi ti s6 (kich thuocv~tchlta/kichthuocthungchlta).Nhuv~y,ne'ulUllcacmffutin c6kichthuoc nhohdnmQtgioih~nnaod6vaomQtddnvi lUlltrii'c6kichthuockhalOn,thlhi~u sua'tsU'd~ngkhonggianiliasedunhod mltcmongmu6n. QuatrlnhlUlltruduQctie'nhanhnhusan: coit~ptinlUllla mQtchu6icacddnvi lUll trii'c6 clingkichthuocla k*L voi k la mQth~ngs6chQntrUoc.Tudngtv nhuthu~t roan(1),khithemmQtmffutin,tathemvaoddnvi cu6iclingtrongt~ptinlUll. Khi xoamQtmffutin,ne'umffutinnaykhongd trongddnvi lUllsancling,thltasetlm mQthoi[lcnhieumffutintrongddnvi lUlld cu6it~ptin saDchot6ngkichthuqccua cacmffutinnaykhongvuQtquakichthuocvungtr6ngtrongddnvi lUllmffutinVITa xoa;r6idichuy€ncacmffutinHmduQcvaoddnvi lUllmffutinVITaxoa. B~ngcachnay,vungtr6ngtrongm6iddnvi lUllkhongbaagiovUQtquaL. Nhuv~y hi~usua'tsU'dt;lngt6ithi€u trenmQtddnvi lUllsela (k-l)*L/(k*L) =(k-l)/k.Nghlala ne'uk cangIonthlhi~usua'tsU'dt;lngkhonggianilia cangcaD.N6i cachkhac,ne'u 53 kichthuocdonvi chuadingIonsovoikichthuoct6idacuamffutinthlhit%usua'tsa d\lngrangcao. DOO vi chO'a thO' Xoacomponent thuIi Ddnvi chO'ad cn6it~ptinh:iu II h ... ... ... ... ... ... ... ... .. T~ptinh:iu trdockhi xoaIi T~ptin h:iusan khi xoaIi Hiob27-Ti~ntrlobxoaml}tcomponentcokichthu'8cdtiobi) 4) ChQncacthongs6trongcaid~tC\lth€ : Cacthongso'phchxacdinhtrongthu~toannayla n (s61§ntach),VI (kichthuoct6i thi€u trongl§n tachI), Vz , ...,Vn=L, k*L (kichthuocdonvi chuatrongt~ptinhilltill cacmffutincokichthuoc<=L) Nhudfi lu'uy, daso'caccomponentadl,mgtextvatheoth6ngke [3]thlkhoangphan ? m1'acactextcomponentnaycokich thuocnhohan IK. d daychQnL =Vn=IK. Docacht%dieuhanhdellchQnkichthuoccuaclusterlamQtlfiythuacua2,nenta clingchQnVI, Vz , ...,Vn-I clingla lily thuacua2 d€ lamtangt6cdQtruyxua't.d day chQnn=3,V2=2K,V[=4K. 54 II 12 - ........................ Nj,Nk,... ........ .. NI N2 ........................ Nj .......... Nk .......... NI N2 ........................ ........ .. ........ .. ........ .. ........ .. Ta ch<;mk =8.Khi d6kichthuocddnvi hill trongt~ptinchuacaem§utinnhohdnL la 8K, va nhuv~yhi<$usua'tsl\'dvngkhonggianilia t6i thi€u la 7/8. II - Cili d;)l yifClht/chifn m(J1giao lac 11.1-Dijt va'nd~ Tranght$HMDB clingnhutrongba'tky cosadfi'lit$unaGkhac,ba'tky 10<;1tthaotac naGtIeDcosadfi'lit$uclingphaibaadamsv tOaDvyndfi'lit$ucuaht$tho'ng.Trang thvctS,doduangtruyenkhongbaadamthongsuo't,ho?cdongu6ndit$nkhonglien tl;lc,ho?cdoco svco'a cacmaytr<;1mho?cdocodfi'lit$ubi khoabai cacmaytr<;1m khacmacacthaotactIeDcoth€ bi ngihngangdQtngQt;d~nWisvkhongtOaDvyndfi' lit$u.Vit$cbaadamchotOaDbQht$tho'ngtIeDmQtph<;1mvi rQnglamvit$cdungd~n lientl;lcladieukhothvchit$nduQc. d daysetrlnhbaymQtcochSkhoiphl;lCl<;1iSvtoaDvyndfi'lit$ukhicoSvco'lamgiao taccha'mdlitba'thuang. 11.2-Phan tich TrangquatrlnhhO<;1tdQngcuaht$tho'ng,conhieumaytr<;1mtruyxua'tdfi'lit$ud6ng thai.Tuy nhien,khi mQtmaytr<;1mthvchit$nchu6icacthaotaclamco sa dfi'lit$u khongtOaDvyn(chodSnkhichu6ithaotaccha'mdut),thlht$tho'ngphaibaadamla ho?cnganch?nsvtruyxua'tucacmaytr<;1mkhacVaGnhfi'ngph~nkhongdungd~n cuacosadfi'lit$u,ho?cb~ngmQtcochSnaGdolamcacmaytr<;1mkhacluontha'yco sadfi'lit$ua tr<;1ngthaitOaDvyn. d day trlnhbay mQtco chSthao tacao. Nghla la khi b~td~ugiaotac,mQtmaytr<;1m seduQctoaDquyenthaotactIeDnhfi'ngdfi'lit$udn thiStchogiaotacdo.Clingluc nay,cacmaytr<;1mkhacv~nduQcdQctOaDbQCSDL ho?cghiVaGnhfi'ngph~nkhong gaytranhcha'pvdimaytr<;1mdangthvchit$ngiaotaco Do'ivdimaytr<;1mdangthvchit$ngiaotac,maychutiSpnh?ncacyelldu dQcvaghi t?P tin,nhungkhongghitrvctiSplencact?PtinV?t19maghiVaGcact?P tin t<;1m thai.May chusekSthQpcact?Ptindfi'lit$uthvcsv vacact?Ptint<;1mthaid€ thvc hit$ncacyell du dQc/ghicuamaytr<;1mvakhiSnchomaytr<;1mluonnhlnCSDL a tr<;1ngthainhula toaDbQCSDL dangdanhriengchomaytr<;1mnay. Khi cosvco'xayra lamgiaotaccha'mdutba'thuang,maychuchidongianhuybo cact?Ptint<;1mthai.NSugiaotachoanta'trQnVynthlmaychusechuy€ndfi'lit$utu cact?Ptint<;1mthaiVaGcact?Ptindfi'lit$uthvcSv.Trangquatrlnhchuy€ndfi'lit$utu cact?Ptint<;1mthai,maychuphaibaadamr~ngkhongcogiaotacnaGkhactruyxua't leDcacvlingdfi'lit$udangC?Pnh?t. 56 Cd che'naythaythe'yelldu baadamciih<$th6nglamvi<$cdungd~nlient\lCthanh yellc~umaychuphailudndu'Qcbaadamlamvi<$clienWc.Ngoaifa,vi<$ccaid~tcd che'nayclingphaibaadamsljthayd6ichu'dngtrinhlaItnhfft. mnh 28-Thtfchi~ngiaotac Cdche'caid~tnhu'san: . Khi b~td~umQtgiaolaC,maytr~mphaigQihamBeginTransactionOdemaychu bie'tvat~ocact~ptindfi'li<$ut~mthai. . Khi ke'tthucgiaolaC,maytr~mphaigQihamEndTransactionOvamaychusegQi hamTransferOdechuyendfi'li<$utucact~ptint~mthaivaocact~ptindfi'li<$uthljc slj. . Cac ham read,write, seek,open,closedu'Qcthay b~ngcac ham DBRead, DBWrite,DBSeek,DBOpen,DBClose.Cacthamso'khigQihamlakhdngd6i. . Cacvungdu'Qc~pnh~tsekhdngghingaylen t~ptindfi'li<$uth~tmadu'Qcghi lent~ptint~m.CffutrucINFOBLOCK dungdehilltmoffset,sizecuavungc~pnh~t. Cacvungc~pnh~tcuamQtt~ptindfi'li<$udu'Qclink voi nhauthanhmQtchu6itheo thlitVoffsettangd~n. . CffutrucINFOFILE hillgifi'tent~ptindfi'li<$uth~t,kkh thu'oct~ptin,contrDhi<$n thai,handlecuat~ptin,contrDde'nblockcooffsetnhDnhfft. 57 ITP tindliliu tMt1 I'" dQc . ITP tindliliu tht 2 I 1)Ltiu trli cac lienM Cac yell....... gilia tp cffutruy Tp tin dir Iiu tm tintl;lffi xufft vatMt 0- HVung CP nMt lcua tp tin 1 I dQc/ghi-- 2)T6ng IVungcp nMt lcua tp tin 2 I h<;1pdli liu '- .jVung cp nht 2 cuatp tin 1 I I.... 1 typedefstructINFO BLOCK { int Next; long Size; long OrgOff; long TempOff; }; /I offsettrent~ptinth~t II offsettrent~ptintl;tm typedefstructINFOFILE { char DINT HFILE LONG LONG LONG FileName[140]; fuMode; hFile; Offset; Size; OldSize; PtBlock; II tent~ptindii'li~utMt II handlecuat~ptindii'li~utMt int II kichthu'ocmOicuat1ji.ptindfi'li~uth1ji.t II kichthu'ocdl cuat~ptindii'li~uth~t II cantrode'nblockc~pnMt cooffsetnhOnhilt }; LienM giii'at~ptintl;tmva caet~ptindii'li~u IT~Ptindii'li~utl;tmI T~ptindii'li~u2 mob 29-Chny~ndt1li~nsankhi k€t thtiegiaohie Tren mayddn,thu?troannayclingduQCsadvngnh~mbaav~dfi'li~ukhi bi ma't ngu6ndQtngQt.Khi do,d~baadamt?Ptint<;1mthaiduQcghichiCicchiCinleuilia,h~ dieuhanhphaiclingca'pWigQih~th6ngFlushO,ghivungd~mcuat?Ptin leuilia. Trenmayddn,co2 truanghQp . Ne'ugiaotacchuahoanthanhmabi ma'tngu6n,thikhi co ho<;1tdQngl<;1i,h~th6ng chi ddngianxoat?P tindfi'li~ut<;1m. . Ne'ugiaotacdahoanthanhvabi ma'tngu6ntruocho?ctrongquatrlnhtransfer, h~th6ngv~nbaadamho<;1tdQngt6tvi ca'utrueINFOBLOCK xacdinhcacvung 58 thayd6icuat~ptindl1'lit$uth~theooffsettuyt$td6i.HamtransferOdn b6sung themtie'ntrlnhghicolenilia,danhda'unhl1'ngblockdi'idu'<;lcchuy€ntil't~ptindl1' lit$ut<;lmsangdl1'lit$uth~t. Thu~tloannaycou'udiemla chuy€ng~nnhu'l~ptuccacchu'cJngtrlnhvie'tchomay dcJnthanhcacchu'cJngtrlnhtrenht$th6ngclient-server.Tuy v~y,ve thlfccha't,thu~t loannaytu~ntlfhoacacgiaolac;nennolamch~mslfv~nhanhht$th6ng. Ma hlnhVilas- Satiddexua'tvit$chiam<;lngHMDB thanhcacm<;lngcon- hyperset. Bieu nayselamvit$ctranhdvngdQkhi c~pnh~tronenthu~ntit$nhcJn.Vit$cdang bQhoacacgiaolac dangthaiconphVthuQcra'tnhieuve vit$cdexua'tmahlnhve khoangnhln,diu hoitroyva'n,cacrangbuQctn3nHMDB. Nhl1'ngdieunayla vu'<;ltra ngoaiph<;lmvi detai. Hddngphattri@nmohlob CSDL hypermedia 1)Trongmohlnhciiitie'n,trlnhduy~thQ'chi~ncacthaolacnhu'kichho~t/dongmQt component,chuy€nd6igiuaidltencomponent,...Cacthaolacnayphaidu'QCchuffn hoathanht?Pcachamvathongbao,dongvaitragiaotie'pgiuatrlnhduy~tvacac thanhphfintichhQp.Tu'ongtQ',m~tgiaotie'pgiuacompositecomponentvacac componentconclingphaidu'Qcxacdinh. 2)Compositecomponentdu'Qcd(ut~otircaccomponentkhac.Caccomponentnay l~icothela composite.TuyV?y,h~th6ngphainganch~nvi~cca'uthanhl~pvang giuacaccomponent. 3)Vi~cquail19m~ngcaccomponentsetronenphl1ct~pkhikichthu'ocm~ngtronen quaIon.Khi dom~ngcaccomponentnendu'Qcphanchiathanhcacm~ngcon. Phu'ongthl1cphanho~chm~ngcaccomponentphaidu'Qcxacdinh. 4)Xacdinhkhoangnhlnvaphanchiaquyensitdvngchongu'oidung.Khoangnhln baog6mcaccomponent,cacbQph?ncuacomponentvacacthaolactrencomponent do. 5)XacdinhmQtngonnguhoid€ truytlmduli~utrenh~CSDL hypermedia. Ungd\mg: . . MQth~CSDL hypermediadongianclingdacothephattri€n thanhphfinmemtQ' di€n bachkhoaloanthu',phfinmemd~yhQC. . LamcacWEB nQibQconhieukhanangbi€u di~nboncacWEB nQibQhi~nnay. CacbQduy~tHTML cothedu'Qcxemnhu'mQthanhphfintichhQpvaoh~th6ng vacact?PtinHTML du'QcoilamQtd~ngmedianguyenthuy. 60 Tai lieuthamkhao. [1]VilasWuwongse,SatidSingkorapoom.An Object-OrientedDataModelfor HypermediaDatabases.IFIP 1991 [2]Kaj Gr0nbrek,RandallH. Trigg.DesignissuesforaDexter-basedhypermedia system.Milano,November30- December4,1992 [3]MauriceJ. Bach.Thedesignof theUnixoperatingsystem.Prentice-Hall,1986 [4]Ch€ QuangQuy~n.Lu~nvanth~cSIkhoahQc.1996 [S]PaulDe Bra, Geert-JanHouben,YoramKornatzky.An ExtensibleDataModel forHyperdocuments.Associationfor ComputingMachinery,1992 [6]RobertSedgewick,PrincetonUniversity.Algorithms.Addison-Wesley PublishingCo.,2ndedition,1988.