DTD ??

1
DTD ??

• ????????????????,?????????????????????????
  PowerPoint ?????????
• ??????????????
• ?????????
• ???????? ??
• ???????????
• ??????????????
• ??????????PowerPoint??????????????????????????
  ????????

• XML Lab.
• ???

2
?? DTD ?

• ??????
• Document Type Definition
• ??????????
• ?XML???????
• DTD?????????
• ??????????????
• ?????????????????
• Valid XML???????DTD??

3
DTD ??

• ??DTD??
• ??????,????????DTD
• ??DTD??
• ?????PROLOG????
• ????????????
• ??????????
• ????(override)???????

4
DTD ??

• XML spec??Backus Naur Form (BNF)??, ??????
• XMLDecl 'lt?xml' VersionInfo EncodingDecl?
  SDDecl? S? '?gt'
• SDDecl S 'standalone' Eq (("'" ('yes'
  'no') "'") ('"' ('yes' 'no') '"'))
• doctypedecl lt!DOCTYPE S Name (S
  ExternalID)? S? ( (markupdecl PEReference
  S) S?)? gt
• ExternalID 'SYSTEM' S SystemLiteral
  'PUBLIC' S PubidLiteral S SystemLiteral

5
?? DTD (1)

• lt?xml version1.0?gt
• lt!DOCTYPE EMAIL
• lt!ELEMENT EMAIL (TO, FROM, CC, SUBJECT, BODY)gt
• lt!ELEMENT TO (PCDATA)gt
• lt!ELEMENT FROM (PCDATA)gt
• lt!ELEMENT CC (PCDATA)gt
• lt!ELEMENT SUBJECT (PCDATA)gt
• lt!ELEMENT BODY (PCDATA)gt
• gt
• ltEMAILgt
• ltTOgtchenhsiu_at_gens.dhs.orglt/TOgt
• ltFROMgtb87506017_at_csie.ntu.edu.twlt/FROMgt
• ltCCgtemacs_at_ms38.url.com.twlt/CCgt
• ltSUBJECTgtHello XMLlt/SUBJECTgt
• ltBODYgtblah, blahlt/BODYgt
• lt/EMAILgt

6
?? DTD (2)

• ?IE???XML??

7
?? DTD (3)

• ???????,XML parser??DTD?????????(valid)
• ???elements???doctypedecl??? ??
• ??????????
• ????????????, ???(override)?????????

8
?? DTD (1)

• lt!DOCTYPE EMAIL (SYSTEMPUCLIB) email.dtdgt
• ????
• SYSTEM???URI??,??????????????????????
• ?????????,??DTD????????????,?????PUCLIB???,???????
  ???????
• ???????????????????,???????????

9
?? DTD (2)

• ????DTD???
• example.xmllt?xml version1.0 encodingBIG5
  standaloneyes?gtlt!DOCTYPE EMAIL SYSTEM
  email.dtdgt....
• email.dtdlt?xml version1.0 encodingISO-8859-1
  ?gtlt!ELEMENT EMAIL (TO, FROM, CC, SUBJECT,
  BODY)gt
• lt!ELEMENT TO (PCDATA)gt
• lt!ELEMENT FROM (PCDATA)gt
• lt!ELEMENT CC (PCDATA)gt
• lt!ELEMENT SUBJECT (PCDATA)gt
• lt!ELEMENT BODY (PCDATA)gt

10
????

• Grammar
• elementdecl 'lt!ELEMENT' S Name S contentspec
  S? 'gt
• contentspec 'EMPTY' 'ANY' Mixed
  children
• Mixed '(' S? 'PCDATA' (S? '' S? Name) S?
  ')' '(' S? 'PCDATA' S? ')
• children (choice seq) ('?' '' '')?

11
??????(1)

• EMPTY
• ???????????????ex ltBR/gt
• ANY
• ?????DTD?????????????
• ???(Mixed)
• ???????????,? ??, ex lt!ELEMENT EXAMPLE
  (PCDATAxyz)gt

12
??????(2)

• PCDATA ????????,????,??XML parser?????
• CDATA?????????,?????,????????????, ex
• lt!CDATAltTESTgtLaLaLalt/TESTgtgt

13
??????(3)

• ????

() ?????? (A,B)
, ?????? (A,B,C)
?(???) (AB)
? ?????? (A?,B)
????? (A,B)
????? (A,B,C)
14
????

• Grammar
• AttlistDecl 'lt!ATTLIST' S Name AttDef S?
  'gt'
• AttDef S Name S AttType S DefaultDecl
• AttType StringType TokenizedType
  EnumeratedType
• TokenizedType 'ID' 'IDREF' 'IDREFS'
  'ENTITY' 'ENTITIES' 'NMTOKEN' 'NMTOKENS'
• DefaultDecl 'REQUIRED' 'IMPLIED'
  (('FIXED' S)? AttValue)

15
????

• ??????????????????,?? ltfont colorredgtTESTlt/fo
  ntgt??????TEST?????
• ???????????,?????????????
• ????????DTD?????,???????????????,????????

16
??(?)

• ...
• lt!ELEMENT EMAIL (TO, FROM, CC, BCC, SUBJECT,
  BODY)gt
• lt!ATTLIST EMAIL LANGUAGE (WesternGreekChinese)
  ChineseENCRYPTED CDATA IMPLIEDPRIORITY
  (NORMALLOWHIGH) NORMALgt
• ...
• lt!ELEMENT BCC (PCDATA)gt
• lt!ATTLIST BCC HIDDEN CDATA FIXED TRUEgt
• ...

17
????

• lt!ENTITY EntityName EntityDefinitiongt
• ?????DTD????,??????????
• ?? lt!ENTITY SIGNATURE ChenHsiugt
  ??SIGNATURE??????DTD?,????????????????,??????????
  ChenHsiu
• ltBODYgt
• Hello, This is SIGNATURE!
• lt/BODYgt

18
????

• lt!ENTITY HIDDEN CDATA FIXED TRUEgt
• ???????????,????????????
• ?????DTD????,???DTD??????
• ?????????DTD??????????
• lt!ATTLIST BCC HIDDEN HIDDENgt

19
INCLUDE IGNORE

• lt!IGNOREDTD sectiongt
• lt!INCLUDEDTD sectiongt
• IGNORE??INCLUDE??????????DTD??????????
• ???????????????,??????????
• lt!IGNORElt!ELEMENT BCC(PCDATA)gt
• lt!ATTLIST BCC HIDDEN CDATA
• FIXED TRUEgtgt
• lt!INCLUDElt!ELEMENT SUBJECT (PCDATA)gtgt

20
INCLUDE IGNORE

• lt!IGNOREDTD sectiongt
• lt!INCLUDEDTD sectiongt
• IGNORE??INCLUDE??????????DTD??????????
• ???????????????,??????????
• lt!IGNORElt!ELEMENT BCC(PCDATA)gt
• lt!ATTLIST BCC HIDDEN CDATA
• FIXED TRUEgtgt
• lt!INCLUDElt!ELEMENT SUBJECT (PCDATA)gtgt

21
????

• ????(PI)??????????????????
• PI?????????????,????????XML???????
• lt?AVI CODECVIEDO1 COLORS256?gt
• lt?WAV COMPRESSORADPCM RESOLUTION16?gt

22
???????

• ??????(well-formed)????????DTD
• ??????????,???????????. parser?????????DTD,???????
  ????DTD
• ???XML??????????,????RMD
• NONE????DTD
• INTERNAL?????DTD
• ALL?????????????DTD

23
??

• XML???????????????????,?DTD?????????????
• ??????
• ????????
• ??????
• ??????