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¥¿¦p¡eXML Names¡f¤¤©Ò³W©w¡M¨Ï¥Î XLink ¤¸¯À©MÄݩʻݭnÁn©ú XLink ©R¦WªÅ¶¡¡C¨Ò¦p¡M¤U¦CÁn©ú¨Ï«eºó xlink ¦b myElement ¤¸¯À¤º¥i¥Î¨Óªí¥Ü XLink ©R¦WªÅ¶¡:

<myElement
  xmlns:xlink="http://www.w3.org/1999/xlink">
  ...
</myElement>

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XLink ªº©R¦WªÅ¶¡´£¨Ñ¥þ§½Äݩʵ¹¦b¥ô¦óªº¥ô·Nªº©R¦WªÅ¶¡¤¤ªº¤¸¯À¨Ï¥Î¡C³o¨Ç¥þ§½ÄݩʬO type¡Nhref¡Nrole¡Narcrole¡Ntitle¡Nshow¡Nactuate¡Nlabel¡Nfrom¡N©M to¡C¤åÀɧ@ªÌ¦b¥L­Ì¦Û¤vªº©R¦WªÅ¶¡¤º¡M©Î¬Æ¦Ü¦b¤£ÄÝ¥L­Ì±±¨îªº©R¦WªÅ¶¡¤ºªº¤¸¯À¨Ï¥Î XLink ¥þ§½ÄݩʡM³o¨Ç¤¸¯À³£¥i¬Ý¦¨¬O XLink ¤¸¯À¡Ctype Äݩʪí©ú XLink ¤¸¯ÀªºÃþ«¬¡]simple¡Nextended¡Nlocator¡Narc¡Nresource¡N©Î title¡^¡Q¤¸¯ÀÃþ«¬³W©w XLink ±j¨îªº¬ù§ô¡M³o¨Ç¬ù§ô¬O XLink ¤¸¯À¥²¶·¿í±qªº¥H¤Î XLink À³¥Îµ{§Ç¹J¨ì XLink ¤¸¯À¥²¶·±Ä¨úªº¦æ¬°¡C

¤U­±¬O¤@­Ó¦³ XLink ¥þ§½Äݩʪº«D XLink ©R¦WªÅ¶¡ªº crossReference ¤¸¯Àªº¤@­Ó¨Ò¤l¡R

<my:crossReference
  xmlns:my="http://example.com/"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xlink:type="simple"
  xlink:href="students.xml"
  xlink:role="http://www.example.com/linkprops/studentlist"
  xlink:title="¾Ç¥Í¦W³æ"
  xlink:show="new"
  xlink:actuate="onRequest">
²{¦³¾Ç¥Íªº¦W³æ
</my:crossReference>

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4.1 XLink ÄݩʥΪk¼Ò¦¡

¥Ñ©ó XLink ÄݩʨϥΩR¦WªÅ¶¡¾÷»s¦Ó³Q¬Ý°µ¬O¥þ§½ªº®É­Ô¡M¥L­Ì¦b¥ô¦ó¤@­Ó XLink ¤¸¯ÀÃþ«¬¤W©Ò¤¹³\ªº²Õ¦X·¥¤j¦a¨Ì¿à¤_¥L­Ì©Ò¦bªº¤¸¯Àªº¯S©wªº type Äݩʪº­È¡]§ó¦hªº«H®§½Ð°Ñ¬Ý5.3 XLink ¤¸¯ÀÃþ«¬Äݩʡ]type¡^¡^¡C¥»³W®æ»¡©úªº¤@­P©Ê­­¨îªºµùÄÀ¸Ô²Ó»¡©úÁA¥L­Ì©Ò¤¹³\ªº¥Îªk¼Ò¦¡¡C¥H¤U¬O¤£¦P¤¸¯ÀÃþ«¬¡]¦C¡^©Ò¤¹³\ªº¥þ§½Äݩʡ]¦æ¡^ªº·§­n¡M¨Ãµ¹¥X¨ä­È¬O§_¬O¥²¦³¶µ¡]R¡^©Î¥i¿ï¶µ¡]O¡^¡R

simple extendedlocatorarcresource title
typeR RRRRR
href O R
role OOOO
arcrole OO
title OOOOO
show OO
actuate OO
label OO
from O
to O

¡]¥t¥~°Ñ¬ÝB DTD ¼Ë¥»©Ò´£¨Ñªººt¥ÜÄݩʩҤ¹³\¼Ò¦¡ªº«D¼Ð·Çªº DTD¡C¡^

¥»³W®æ»¡©ú¨Ï¥Î¡§xxx-Ãþ«¬¤¸¯À¡¨ªº®æ¦¡¨Ó«ü¨º¨Ç¥²¶·ªþÆØ¤_»P XLink ¤¸¯ÀÃþ«¬¬ÛÃöªº¦³¦WºÙªº­­¨î¶°¦Xªº¤¸¯À¡M¦ÓµL½×¸Ó¤¸¯À¹ê»Ú¤Wªº¦WºÙ¬O¤°»ò¡C¨Ò¦p¡M¡§locator-Ãþ«¬¤¸¯À¡¨·|¯A¤Î©Ò¦³ªº¤U¦C¦U¶µ¤¸¯À¡R

<locator xlink:type="locator" ... />
<loc xlink:type="locator" ... />
<my:pointer xlink:type="locator" ... />

4.2 XLink ¤¸¯ÀÃþ«¬Ãö«Y

¦UºØ¤£¦Pªº XLink ¤¸¯ÀÃþ«¬¥H¨ä¥Lªº XLink ¤¸¯ÀÃþ«¬ªºª½±µ«Ä¤lªº¤è¦¡¥X²{ªº®É­Ô¡M¥Ñ¥»³W®æ»¡©ú³W©wªº¥L­Ì¯S¦³ªº§t¸q¡C¥H¤U¬O¦b¯S©wªº¤÷¥À¤¸¯ÀÃþ«¬¤¤§êºt­«­n¨¤¦âªº«Ä¤l¤¸¯ÀÃþ«¬ªº·§­n¡]¨ä¥Lªº²Õ¦X«h¨S¦³ XLink ³W©wªº­«­n©Ê¡^¡C

¤÷Ãþ«¬­«­nªº¦ÛÃþ«¬
simplenone
extended locator¡Marc¡Mresource¡Mtitle
locatortitle
arc title
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titlenone

4.3 ÄݩʭȪº¯Ê¬Ù

¨Ï¥Î XLink ¥i¯à¯A¤Î¨Ï¥Î«Ü¦hªºÄݩʨӴ£¨Ñ­«­nªºÃì±µ«H®§¡C¦b¯S©wÃþ«¬ªº©Ò¦³¤åÀɪº¨C¤@­Ó¹ê¨Ò¤¤¡M´Á±æªºÄݩʭȳ£¤£Åܪº±¡ªp¤U¡M ¥i¯à²K¥[Äݩʯʬ٭ȡ]©T©wªº©Î¤£©T©wªº¡^¨ì DTD ¤¤¡M¥H«K³o¨ÇÄݩʵL¶·¨ãÅé¦a¥X²{¦b¤¸¯À¶}©l¼ÐÅÒ¤W¡C¨Ò¦p¡M¦b4 XLink ¸m¼Ðªº³]­p XLink Äݩʸm¼Ð³]­p¤¶²Ð¤¤ªº¨Ò¤l¤¤¡M¦pªG¹ï xmlns:xlink¡Mxmlns:my¡Mtype¡Mshow¡M©M actuateÄݩʴ£¨Ñ¤Fªº¯Ê¬Ù¡M«h¸Ó¨Ò¬Ý°_¨Ó±N·|¬O³o¼Ë¡R

<my:crossReference
  xlink:href="students.xml"
  xlink:role="http://www.example.com/linkprops/studentlist"
  xlink:title="¾Ç¥Í¦W³æ">
²{¦³¾Ç¥Íªº¦W³æ
</my:crossReference>

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4.4 ¾ã¦X XLink ¥Îªk»P¨ä¥Lªº¸m¼Ð

¥»³W®æ»¡©ú¥u©w¸q¦b XLink ©R¦WªÅ¶¡¤¤ªºÄݩʩMÄݩʭȡM¨S¦³­­¨î«D XLink ÄݩʻP XLink Äݩʤ@°_¨Ï¥Î¡C¦¹¥~¡M¤j¦h¼Æªº XLink ÄݩʬO¥i¿ï¶µ¡M¦Ó¥B¿ï¾Ü²³æ©ÎÂX®iÃì±µ¬O¥Ñ¸m¼Ð³]­pªÌ©Î¤åÀɳЧ@ªÌ¨M©w¡M¦]¦¹¡M¨Ï¥Î XLink ¯S¼xªº DTD ¤£»Ý­n¨Ï¥Î©ÎÁn©ú¾ã­Óªº XLink's ªºÄݩʶ°¦X¡C³Ì«á¡MÁöµM¥»³W®æ»¡©ú¦b XLink ¸m¼Ð¤Wªº¥u½T©w¤F³Ì¤p­­¨î¡M¨Ï¥Î XLink ªº DTD ¥i¥HÀH·Nªº¥[±j³o¨Ç­­¨î¡CXLink ªº¨Ï¥Î¤£±Æ°£¦³®Äªº¤åÀÉ¿í±q¥¦©ÒÄݪº DTD ¤¤©Òªí¹Fªº­­¨î¡C

¥H¤U¬O¬J¦³ XLink ¤S¦³«D XLink Äݩʪº crossReference ¤¸¯Àªº¨Ò¤l¡R

<my:crossReference
  xmlns:my="http://example.com/"
  my:lastEdited="2000-06-10"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xlink:type="simple"
  xlink:href="students.xml">
²{¦³¾Ç¥Íªº¦W³æ
</my:crossReference>

4.5 »P¶Ç²Îªº¸m¼Ð¤@°_¨Ï¥Î XLink

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5 XLink ¤¸¯À©MÄÝ©Ê

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XLink ©w¸q¤F¤@­Ó¤èªk¨Óµ¹ÂX®iÃì±µ¯S§Oªº»y¸q¥H«K´M§äÃìµ²®w¡Q¨Ï¥Î³oºØ¤èªk¡MÂX®iÃì±µÀ°§U XLink À³¥Îµ{§Ç³B²z¨ä¥LªºÃì±µ¡C

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¦b extended-Ãþ«¬¤÷¤¸¯À¤§¤º¥ô¦ó¦a¤èªº simple ©Î extended Ãþ«¬ªº¤l¤¸¯À³£¨S¦³ XLink ©Ò¸ü©úªº²[¸q¡C¤£¬O extended-Ãþ«¬ªºª½±µ«Ä¤lªº locator¡Marc ©Î resource Ãþ«¬ªº¤l¤¸¯À«h¨S¦³ XLink ©Ò¸ü©úªº²[¸q¡C

extended-Ãþ«¬¤¸¯À¥i¯à¦³»P»y¸q¦³Ãöªº role ©M title Äݩʡ]°Ñ¬Ý5.5 »y¸qÄݩʡ]role¡Marcrole¡M©M title¡^¡^¡C¥¦­Ì´£¨ÑÃì±µ¾ãÅé¤Wªº»P»y¸q¦³Ãöªº¸ê°T¡Qrole Äݩʫü¥X¾ã­ÓÃì±µ©Ò¨ã¦³ªº¯S©Ê¡M¦Ó title Äݩʴ£¨Ñ¤HÃþ¥iŪªº¾ã­ÓÃì±µªº´y­z¡C¦pªG¨ä¥L XLink ÄݩʥX²{¦b¸Ó¤¸¯À¡M¥L­Ì¹ï¸ÓÃì±µ³£¨S¦³ XLink ©Ò¸ü©úªºÃö«Y¡C¦pªG¤@­Ó¼ÐÃD title ÄݩʩM¤@­Ó©Î¦h­Óªº title-Ãþ«¬ÄݩʥX²{¦b¸Ó¤¸¯À¡M¥L­Ì¹ï¸ÓÃì±µ³£¨S¦³ XLink ©Ò¸ü©úªºÃö«Y¡Q¦b XLink ¤W«Ø³yªº°ª¼hÀ³¥Îµ{§Ç©Î³\±N·|¹ï¦b³o±¡ªp«ü©w¾A·íªº³B²z¤èªk¨Ò¦p¡M¨Ï¥ÎÀu¥ý¶¶§Ç¡^¡C

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<!ELEMENT courseload ((tooltip|person|course|gpa|go)*)>
<!ATTLIST courseload
  xmlns:xlink     CDATA           #FIXED "http://www.w3.org/1999/xlink"
  xlink:type      (extended)      #FIXED "extended"
  xlink:role      CDATA           #IMPLIED
  xlink:title     CDATA           #IMPLIED>

<!ELEMENT tooltip ANY>
<!ATTLIST tooltip
  xlink:type      (title)         #FIXED "title"
  xml:lang        CDATA           #IMPLIED>

<!ELEMENT person EMPTY>
<!ATTLIST person
  xlink:type      (locator)       #FIXED "locator"
  xlink:href      CDATA           #REQUIRED
  xlink:role      CDATA           #IMPLIED
  xlink:title     CDATA           #IMPLIED
  xlink:label     NMTOKEN         #IMPLIED>

<!ELEMENT course EMPTY>
<!ATTLIST course
  xlink:type      (locator)       #FIXED "locator"
  xlink:href      CDATA           #REQUIRED
  xlink:role      CDATA           #FIXED "http://www.example.com/linkprops/course"
  xlink:title     CDATA           #IMPLIED
  xlink:label     NMTOKEN         #IMPLIED>

<!-- GPA = "¥­§¡¤À¼Æ" -->
<!ELEMENT gpa ANY>
<!ATTLIST gpa
  xlink:type      (resource)      #FIXED "resource"
  xlink:role      CDATA           #FIXED "http://www.example.com/linkprops/gpa"
  xlink:title     CDATA           #IMPLIED
  xlink:label     NMTOKEN         #IMPLIED>

<!ELEMENT go EMPTY>
<!ATTLIST go
  xlink:type      (arc)           #FIXED "arc"
  xlink:arcrole   CDATA           #IMPLIED
  xlink:title     CDATA           #IMPLIED
  xlink:show      (new
                  |replace
                  |embed
                  |other
                  |none)          #IMPLIED
  xlink:actuate   (onLoad
                  |onRequest
                  |other
                  |none)          #IMPLIED
  xlink:from      NMTOKEN         #IMPLIED
  xlink:to        NMTOKEN         #IMPLIED>

¥H¤U¬O XML ¤¸¯À¨Ï¥Î³o¨ÇÁn©ú¬Ý°_¨Óªº¥i¯àªº¼Ë¤l¡C

<courseload>

  <tooltip>´Î-ã´µªº½Òµ{­t²ü</tooltip>

  <person
    xlink:href="students/patjones62.xml"
    xlink:label="student62"
    xlink:role="http://www.example.com/linkprops/student"
    xlink:title="´Î-ã´µ" />

  <person
    xlink:href="profs/jaysmith7.xml"
    xlink:label="prof7"
    xlink:role="http://www.example.com/linkprops/professor"
    xlink:title="²Â-´µ±K¥q³Õ¤h" />
  <!-- §ó¦hªº±Ð±Â¡N±Ð¾Ç§U¤â¡N¤Î¨ä¥Lªº»·µ{¸ê·½ -->

  <course
    xlink:href="courses/cs101.xml"
    xlink:label="CS-101"
    xlink:title="­pºâ¾÷¬ì¾Ç 101" />
  <!-- §ó¦hªº½Òµ{¡N¬ã¨s·|¡N¤Î¨ä¥Lªº»·µ{¸ê·½ -->

  <gpa xlink:label="PatJonesGPA">3.5</gpa>

  <go
    xlink:from="student62"
    xlink:to="PatJonesGPA"
    xlink:show="new"
    xlink:actuate="onRequest"
    xlink:title="´Î-ã´µªº¥­§¡¦¨¶Ö" />
  <go
    xlink:from="CS-101"
    xlink:arcrole="http://www.example.com/linkprops/auditor"
    xlink:to="student62"
    xlink:show="replace"
    xlink:actuate="onRequest"
    xlink:title="´Î-ã´µ¡M®ÇÅ¥¥»½Òµ{" />
  <go
    xlink:from="student62"
    xlink:arcrole="http://www.example.com/linkprops/advisor"
    xlink:to="prof7"
    xlink:show="replace"
    xlink:actuate="onRequest"
    xlink:title="²Â-´µ±K¥q³Õ¤h¡M«ü¾É¦Ñ®v" />

</courseload>

5.1.1 ÂX®iÃì±µªº¥»¦a¸ê·½¡]resource-Ãþ«¬¤¸¯À¡^

ÂX®iÃì±µ³q¹L¦bÂX®iÃì±µ¤º¥X²{ªº¯S©w¤l¤¸¯Àªº¤è¦¡¼Ð©ú¥¦©Ò¤À¨Éªº¥»¦a¸ê·½¡C¾ã­Óªº¤l¤¸¯À¡M³s¦P¥¦ªº¥þ³¡¤º®e¤@°_ºc¦¨¥»¦a¸ê·½¡C

¥»¦a¸ê·½ªº XLink ¤¸¯À¬O¥ô¦ó±a¦³¤@­ÓÄÝ©ó XLink ©R¦WªÅ¶¡ªº¡N¦W¬° type ¥B­È¬°¡§resource¡¨ªºÄݩʪº¤¸¯À¡C

resource-Ãþ«¬¤¸¯À¥i¯à¦³¥ô¦óªº¤º®e¡Q¤£½×¥X²{ªº¬O¤°»ò¤º®e¹ïÃì±µ³£¨S¦³ XLink ©Ò¸ü©úªºÃö«Y¡Cresource-Ãþ«¬¤¸¯À¥i¯à¨S¦³¤º®e¡Q¦b³o¼Ëªº±¡ªp¤U¥¦³Q¥Î§@¥Xµo¸ê·½¡M¹w´Á¦b±µ¨ì½Ð¨D®É¶}©l¹C¾ú¡M¥æ¤¬¦¡ XLink À³¥Îµ{§Ç¨å«¬¦a±N·|²£¥Í¤@¨Ç¤º®e¥H«Kµ¹¥Î¤á¤@­Ó¤èªk¶}©l¸Ó¹C¾ú¡C¦pªG resource-Ãþ«¬¤¸¯À¦³°£¤F extended-Ãþ«¬¤¸¯À¤§¥~ªº¨ä¥¦ªº¤÷¥À¡Mresource-Ãþ«¬¤¸¯À«h¨S¦³ XLink ©Ò¸ü©úªº²[¸q¡C

The resource-Ãþ«¬¤¸¯À¥i¯à¦³»P»y¸q¦³Ãöªº role ©M titleÄݩʡ]°Ñ¬Ý5.5 »y¸qÄݩʡ]role¡Marcrole¡M©M title¡^¡^©M¹C¾úªºÄÝ©Ê label¡]°Ñ¬Ý5.7 ¹C¾úÄݩʡ]label¡Mfrom¡M©M to¡^¡^¡C»y¸q¦³ÃöªºÄݩʦb¤Þ¾É¥¦ªº¯S©w©·ªº¤º®e¥H¥~´£¨ÑÃö©ó¸ê·½ªºÁ`Åé¸ê°T¡QroleÄݩʼХܸ귽ªº¤@­Ó¯S©Ê¡M¦Ó©M title ÄݩʼХܤHÃþ¥iŪªº¸ê·½ªº´y­z¡Clabel Äݩʴ£¨Ñ¤@­Ó¤èªkµ¹ arc-Ãþ«¬¤¸¯À¦b³Ð«Ø¹C¾úªº©·®É¯à¤Þ¥Î¥¦¡C

¨Ò¤l¡Rresource-Ãþ«¬¤¸¯ÀÁn©ú¤Î¹ê¨Òªº¼Ë¥»

¥H¤U¬O¤@­Ó resource-Ãþ«¬¤¸¯ÀªºÁn©úªº«D¼Ð·Ç¶°¦X¡C

<!ELEMENT gpa ANY>
<!ATTLIST gpa
  xlink:type      (resource)      #FIXED "resource"
  xlink:role      CDATA           #FIXED "http://www.example.com/linkprops/gpa"
  xlink:title     CDATA           #IMPLIED
  xlink:label     NMTOKEN         #IMPLIED>

¥H¤U¬O XML ¤¸¯À¨Ï¥Î³o¨ÇÁn©ú¬Ý°_¨Óªº¥i¯àªº¼Ë¤l¡C

  <gpa xlink:label="PatJonesGPA">3.5</gpa>

5.1.2 ÂX®iÃì±µªº»·µ{¸ê·½¡]locator-Ãþ«¬¤¸¯À¡^

ÂX®iÃì±µ¼Ð¥Ü³q¹L©w¦ì¾¹¤¸¯À¤À¨Éªº»·µ{¸ê·½¡C

¥Î¤_©w¦ì¾¹ªº XLink ¤¸¯À¬O¥ô¦ó¦³¤@­ÓÄÝ©ó XLink ©R¦WªÅ¶¡ªº¡N¥B¦W¬° type ªº­È¬° ¡§locator¡¨ ªºÄݩʪº¤¸¯À¡C

locator-Ãþ«¬¤¸¯À¥i¯à¦³¥ô¦óªº¤º®e¡C°£¤F title-Ãþ«¬¤¸¯À¬Oª½±µªº«Ä¤l¥~¡]°Ñ¬Ý5.1.4 ÂX®iÃì±µ¡N©w¦ì¾¹¡N¤Î©·ªº¼ÐÃD¡]title-Ãþ«¬¤¸¯À¡^¡^¡MµL½×¥X²{¤°»ò¤º®e¹ïÃì±µ³£¨S¦³ XLink ©Ò¸ü©úªºÃö«Y¡C¦pªG locator-Ãþ«¬¤¸¯À¥]§t´O®Mªº XLink ¤¸¯À¡M¦³³o¼Ëªº¥]§t¤¸¯À¹ï¤÷Ãì±µ«h¨S¦³ XLink ©Ò¸ü©úªºÃö«Y¡C¦pªG locator-Ãþ«¬¤¸¯À¦³°£¤FÂX®i- Ãþ«¬¤¸¯À¤§¥~ªº¤÷¡M¸Ó locator-Ãþ«¬¤¸¯À«h¨S¦³ XLink ©Ò¸ü©úªº²[¸q¡C

­­¨î¡R¦b©w¦ì¾¹¤¸¯À¤WªºÄÝ©Ê

locator-Ãþ«¬¤¸¯À¥²¶·¦³©w¦ì¾¹Äݩʡ]°Ñ¬Ý5.4 ©w¦ì¾¹Äݩʡ]href¡^¡^¡C©w¦ì¾¹Äݩʡ]href¡^¥²¶·¦³´£¨Ñ¤@­Ó¼Æ­È¡C

locator-Ãþ«¬¤¸¯À¥i¯à¦³»P»y¸q¦³Ãöªº role ©M title Äݩʡ]°Ñ¬Ý 5.5 »y¸qÄݩʡ]role¡Marcrole¡M©M title¡^¡^©M¹C¾úªº label Äݩʡ]°Ñ¬Ý5.7 ¹C¾úÄݩʡ]label¡Mfrom¡M©M to¡^¡^¡C©w¦ì¾¹Äݩʴ£¨ÑÃѧO¤@­Ó»·µ{¸ê·½ªº URI ¤Þ¥Î¡C»P»y¸q¦³ÃöªºÄݩʦb¤Þ¾É¥¦ªº¯S§O©·ªº¤º®e¥~¡M´£¨ÑÃö©ó¸ê·½ªºÁ`Åé¸ê°T¡Qrole ÄݩʼХܸ귽¦³ªº¤@­Ó¯S©Ê¡M¦Ó title ÄݩʼХܤHÃþ¥iŪªº¸ê·½ªº´y­z¡C¼Ð¥ÜÄݩʴ£¨Ñ¤@­Ó¤èªkµ¹¤@­Ó arc-Ãþ«¬¤¸¯À¦b³Ð³y¹C¾úªº©·¤è­±¤Þ¥Î¥¦¡C

ª`·N¡R

locator-Ãþ«¬¤¸¯À¥»¨­¤£¯àºc¦¨¤@­ÓÃì±µ¦]¬°¥¦¶È¶È¦³¤@­Ó©w¦ì¾¹¡]href¡^ÄݩʡQ¤£¹³¤@­Ó simple-Ãþ«¬ ¤¸¯À¡M¥¦¤£¥Í¦¨¦b¥¦¥»¨­©M¤Þ¥Î¸ê·½¤§¶¡ªº¥Ñ XLink ºÞ²zªºÁpô¡C

¨Ò¤l¡Rlocator-Ãþ«¬¤¸¯ÀÁn©ú©M¹ê¨Òªº½d¨Ò

¥H¤U¬O locator-Ãþ«¬¤¸¯ÀÁn©ú¤@­Ó«D¼Ð·Ç¶°¦X¡C

<!ELEMENT person EMPTY>
<!ATTLIST person
  xlink:type      (locator)       #FIXED "locator"
  xlink:href      CDATA           #REQUIRED
  xlink:role      CDATA           #IMPLIED
  xlink:title     CDATA           #IMPLIED
  xlink:label     NMTOKEN         #IMPLIED>

<!ELEMENT course EMPTY>
<!ATTLIST course
  xlink:type      (locator)       #FIXED "locator"
  xlink:href      CDATA           #REQUIRED
  xlink:role      CDATA           #FIXED "http://www.example.com/linkprops/course"
  xlink:title     CDATA           #IMPLIED
  xlink:label     NMTOKEN         #IMPLIED>

¥H¤U¬O XML ¤¸¯À¨Ï¥Î³o¨ÇÁn©ú¬Ý°_¨Óªº¥i¯àªº¼Ë¤l¡C

<person
  xlink:href="students/patjones62.xml"
  xlink:label="student62"
  xlink:role="http://www.example.com/linkprops/student"
  xlink:title="©¬¯S ã´µ" />

<person
  xlink:href="profs/jaysmith7.xml"
  xlink:label="prof7"
  xlink:role="http://www.example.com/linkprops/professor"
  xlink:title="²Â-´µ±K¥q³Õ¤h" />

<course
  xlink:href="courses/cs101.xml"
  xlink:label="CS-101"
  xlink:title="Computer Science 101" />

5.1.3 ÂX®iÃì±µªº¹C¾ú³W«h¡]arc-Ãþ«¬¤¸¯À¡^

ÂX®iÃì±µ¥i¯à³q¹L¤@³s¦ê¥i¿ï¾Üªº©·¤¸¯À¨Óªí©ú¤À¨ÉÃì±µªº¸ê·½¤§¶¡ªº¹C¾ú³W«h¡C

¥Î¤_©·ªº XLink ¤¸¯À¬O¥ô¦ó¦³¤@­ÓÄÝ©ó XLink ©R¦WªÅ¶¡ªº¡N¥B¦W¬° type ­È¬°¡§arc¡¨ªºÄݩʪº¤¸¯À¡C

arc-Ãþ«¬¤¸¯À¥i¯à¦³¥ô¦óªº¤º®e¡C°£¤F¬Oª½±µ«Ä¤lªº title-Ãþ«¬¤¸¯À¤§¥~¡]°Ñ¬Ý¡@5.1.4 ÂX®iÃì±µ¡N©w¦ì¾¹¡N¤Î©·ªº¼ÐÃD¡]title-Ãþ«¬¤¸¯À¡^¡^¡MµL½×¤°»ò¤º®e³£¹ïÃì±µ³£¨S¦³ XLink ©Ò¸ü©úªºÃö«Y¡C¦pªG arc-Ãþ«¬¤¸¯À¦³°£¤Fextended-Ãþ«¬¤¸¯À¤§¥~ªº¥ô¦ó¤¸¯À¬°¤÷¡M¨º»ò¡M¸Ó arc-Ãþ«¬¤¸¯À«h¨S¦³ XLink ©Ò¸ü©úªº²[¸q¡C

arc-Ãþ«¬¤¸¯À¥i¯à¦³¹C¾úÄÝ©Ê from ©M to¡]5.7 ¹C¾úÄݩʡ]label¡Mfrom¡M©M to¡^¡^¡N¦æ¬°ÄÝ©Ê show ©M actuate¡]°Ñ¬Ý5.6 ¦æ¬°Äݩʡ]show ©M actuate¡^¡^¥H¤Î»y¸qÄÝ©Ê arcrole ©M title¡]°Ñ¬Ý5.5 »y¸qÄݩʡ]role¡Marcrole¡M©M title¡^¡^¡C

¹C¾úÄݩʩw¸q¤À¨É¦P¤@Ãì±µªº¸ê·½¹ï¤§¶¡©Ò´Á±æªº¹C¾ú¡M³o¨Ç¸ê·½¥Ñ¥L­Ìªº label Äݩʪº­È¼Ð¥Ü¡C from Äݩʩw¸q¥i¯à¶}©lªº¸ê·½¡M¤]´N¬O¥Xµo¸ê·½¡M¦ÓÄÝ©Ê to ©w¸q¥i¯à¹C¾ú¨ìªº¸ê·½¡M¤]´N¬O²×¤î¸ê·½¡C¦æ¬°Äݩʬ° XLink À³¥Îµ{§Ç«ü©w¹C¾ú¦V²×¤î¸ê·½®É©Ò´Á±æªº¦æ¬°¡C

»y¸qÄݩʴy­z»P¥Xµo¸ê·½ªº¦³Ãöªº©·ªº²×¤î¸ê·½ªº·N¸q¡Carcrole ÄݩʹïÀ³¤_¡eRDF¡fªº¯S©Ê·§©À¡M¦Ó role ¥i¥H¸ÑÄÀ¦¨¡§¥Xµo-¸ê·½ ¦³©·-¨¤¦â²×¤î-¸ê·½¡C¡¨·í§â³o­Ó»P¤W¤U¤å¦³Ãöªº¨¤¦â±q³o­Ó¯S©wªº©·ªº¤W¤U¤å¤¤®³¨«®É¡M¥¦¥i¯à¤£¦P¤_²×¤î¸ê·½ªº·N¸q¡CÁ|¨Ò¨Ó»¡¡M¸ê·½¥i¯àÃö©óªxªx¦a¥Nªí¤@­Ó¡§¤H¡¨¡M¦ý¬O¦b¯S©wªº©·¤W¤U¤å¤¤¡M¥¦¥i¯à¬O­Ó¡§¥À¿Ë¡¨ªº¨¤¦â¡M¦b¥t¤@­Ó¤£¦P©·ªº¤W¤U¤å¤¤¡M¥¦¥i¯à¬O­Ó¡§¤k¨à¡¨ªº¨¤¦â¡C

·í¦P¤@¸ê·½¦b¤@¨Ç©·¡]¤£½×¬O¦b¤@­Ó³æ¿WÃì±µ¤¤©Î¸ó¶V³\¦hªºÃì±µ¡^¤¤³£¥Î§@¥Xµo¸ê·½ªº®É­Ô¡M¹C¾ú-½Ð¨D¦æ¬°¤£¨ü¥»³W®æ»¡©úªº­­¨î¡M¦ý¬O¡M¹ï¥æ¤¬¦¡À³¥Îµ{§Ç¨Ó»¡ªº¤@ºØ¥i¯à©Ê¬O¤@­Ó¦C¥X¦³Ãöªº©·¡N©ÎÃì±µ¼ÐÃDªº¸õ¥X¦¡ªºµæ³æ¡C

¥H¤U¹Ïªí®i¥Ü¤FÁpô¤­­Ó»·µ{¸ê·½ªº¤@­ÓÂX®iÃì±µ¡M¦Ó¥B´£¨Ñ¤F¦b¥L­Ì¤§¤¤¹C¾úªº³W«h¡C©Ò¦³«ü©wªº©·³£¬O²Ä¤T¤è©·¡Q¤]´N¬O»¡¡M©·¶È¶È¥u¦b»·µ{¸ê·½¤§¶¡¡C¹³¤W­±¤@¼Ë¡MµL¦V©Ê¹ê½u¼Ð¥ÜÃì±µ¥¿Áp¦XÆØ¤­­Ó¨ä¥¦ªº¸ê·½¡Q·sªº±a½bÀYªºµê½u¼Ð¥ÜÃì±µ´£¨Ñªº¹C¾úªº³W«h¡Cª`·N¤@¨Ç¸ê·½¨É¦³¬Û¦Pªº label ­È¡C

±a¦³©·ªº¥~³sªºÂX®iÃì±µªº¨Ò¹Ï

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<go xlink:type="arc" xlink:from="A" xlink:to="B" />
<go xlink:type="arc" xlink:from="C" xlink:to="B" />

§@¬°¥t¥~­Ó¨Ò¤l¡M°²³]¤@­Ó¥]§t¤­­Ó©w¦ì¾¹ªºÂX®iÃì±µ¡M¨ä¤¤¨â­Ó label ªº­È¬° ¡§parent¡¨ ¦Ó¥t¥~¤T­Ó label ªº­È¬° ¡§child¡¨ ¡R

<extendedlink xlink:type="extended">
  <loc xlink:type="locator" xlink:href="..." xlink:label="parent" xlink:title="p1" />
  <loc xlink:type="locator" xlink:href="..." xlink:label="parent" xlink:title="p2" />
  <loc xlink:type="locator" xlink:href="..." xlink:label="child"  xlink:title="c1" />
  <loc xlink:type="locator" xlink:href="..." xlink:label="child"  xlink:title="c2" />
  <loc xlink:type="locator" xlink:href="..." xlink:label="child"  xlink:title="c3" />
... <!-- arc-Ãþ«¬¤¸¯À±N¥X²{¦b³o¸Ì -->
</extendedlink>

¥H¤U´y­z¤F±q¤÷¸ê·½¨ì«Ä¤l¸ê·½ªº¹C¾ú¡M¥]¬A©Ò¦³ªº p1-c1¡Np1-c2¡Np1-c3¡Np2-c1¡Np2-c2¡N©M p2-c3¡R

<go xlink:type="arc" xlink:from="parent" xlink:to="child" />

¦pªG¨S¦³¬° from ©Î to Äݩʴ£¨Ñ­È¡M¯Ê¤Öªº­È³Q¸ÑÄÀ¦¨¥Nªí¦b¸Ó extended-Ãþ«¬¤¸¯À¸Ìªº©Ò¦³ locator-Ãþ«¬¤¸¯À¤W´£¨Ñªº¼Ð¥Ü¡C¨Ò¦p¡M¥H¤U´y­z¤F±q¤÷¨ì«Ä¤l¥H¤Î±q«Ä¤l¨ì«Ä¤lªº¹C¾ú¡M¥]¬A©Ò¦³ªº p1-c1¡Np1-c2¡Np1-c3¡Np2-c1¡Np2-c2¡Np2-c3¡Nc1-c1¡Nc1-c2¡Nc1-c3¡Nc2-c1¡Nc2-c2¡Nc2-c3¡Nc3-c1¡Nc3-c2¡N and c3-c3¡R

<go xlink:type="arc" xlink:to="child" />

¦b³o±¡ªp¤U¡Mª`·N¹C¾úªº³W«h¥]¬A±a¦³¬Û¦Pªº¼Ð¥Üªº±q¬Y¨Ç¸ê·½¨ì¨ä¥L¸ê·½ªº©·¡]±q¤@­Ó«Ä¤l¨ì¨ä¥¦«Ä¤l¡^¡M¥H¤Î±q¤@¨Ç¸ê·½¨ì¥L­Ì¦Û¤v¥»¨­¡]±q¤@­Ó«Ä¤l¨ì¥¦¥»¨­¡^¡Q³o¨Ã¤£¬O¤@­Ó¿ù»~¡C

¦bÂX®iÃì±µ¸Ì¦pªG¨S¦³´£¨Ñ arc-Ãþ«¬¤¸¯À¡M¨º»ò¡M¯Ê¤Öªº from ©M to ³q¹LÂX®iªº­È³Q¸ÑÄÀ¦¨¦b¨º­ÓÃì±µ¸Ìªº©Ò¦³ªº¼Ð¥Ü¡C³oµ¥»ù¤_¹ï¥H¤U¹C¾úªº³W®æ»¡©ú¡R

<go xlink:type="arc" />

·í¶W¹L¤@­Ó©w¦ì¾¹¦³¬Û¦Pªº¼Ð¥Ü¡M±a¦³¬Û¦Pªº¼Ð¥Ü©w¦ì¾¹ªº¶°¦X³Q²z¸Ñ¦¨³æ¿Wªº©w¦ì¾¹¡M¦Ó¤£¬O·í°µ¤@­Ó»E¦X¸ê·½¡Q³o¼Ë¤@­ÓÃì±µ¥i¯à¬O»P¤@­Ó©Ò¦³ªº©w¦ì¾¹¦³¤£¦Pªº¨¤¦â¨Ã«ü©w¾A·íªº©·¨Ó¥Í¦¨¬Û¦Pªº¹C¾ú¹ïªºÃì±µªº¹C¾ú¦æ¬°¬Û¦P¡C

¦pªGÂX®iÃì±µ©·ªº¹C¾ú³W«h¬Ù¥h¥ô¦ó¥i¯àªº¹C¾ú¹ï¡MXLink «h¨S¦³¹ï³o¨Ç¹ï©w¸q¹C¾ú¡C°ª¼hÀ³¥Îµ{§Ç¥i¯à¹B¦æªº¤@­Ó«D XLink ¤Þ¾Éªº¹C¾ú¡Q¨Ò¦p¡MÀˬdÃì±µªº¨BÆJ¥i¯à¹C¾ú©Ò¦³¥i¯àªº¸ê·½¹ï¡C

­­¨î¡R©·¤£¯à­«½Æ

¨C¤@­Ó arc-Ãþ«¬¤¸¯À¥²¶·¦³¤@¹ï from ©M to ªº­È¡M³o¨Ç­È¡]¤À§O¦a¡^¤£»P¦b¦P¤@ªºÂX®iÃì±µ¤¤ªº¥ô¦ó¨ä¥Lªº arc-Ãþ«¬¤¸¯Àªº from ©M to ªº­È­«½Æ¡M¤]´N¬O»¡¡MÃì±µ¸Ìªº¨C¤@¹ï¥²¶·¬O¿W¤@µL¤Gªº¡C

¨Ò¤l¡Rarc-Ãþ«¬¤¸¯ÀÁn©ú©M¹ê¨Òªº½d¨Ò

¥H¤U¬O¤@­Ó arc-Ãþ«¬¤¸¯ÀÁn©úªº«D¼Ð·Çªº¶°¦X¡C

<!ELEMENT go EMPTY>
<!ATTLIST go
  xlink:type      (arc)           #FIXED "arc"
  xlink:arcrole   CDATA           #IMPLIED
  xlink:title     CDATA           #IMPLIED
  xlink:show      (new
                  |replace
                  |embed
                  |other
                  |none)          #IMPLIED
  xlink:actuate   (onLoad
                  |onRequest
                  |other
                  |none)          #IMPLIED
  xlink:from      NMTOKEN         #IMPLIED
  xlink:to        NMTOKEN         #IMPLIED>

¥H¤U¬O XML ¤¸¯À¨Ï¥Î³o¨ÇÁn©ú¬Ý°_¨Óªº¥i¯àªº¼Ë¤l¡C

<go
  xlink:from="student62"
  xlink:to="PatJonesGPA"
  xlink:show="new"
  xlink:actuate="onRequest"
  xlink:title="´Î-ã´µªº¥­§¡¦¨¶Ö" />
<go
  xlink:from="CS-101"
  xlink:arcrole="http://www.example.com/linkprops/auditor"
  xlink:to="student62"
  xlink:show="replace"
  xlink:actuate="onRequest"
  xlink:title="´Î-ã´µ¡M®ÇÅ¥¥»½Òµ{" />
<go
  xlink:from="student62"
  xlink:arcrole="http://www.example.com/linkprops/advisor"
  xlink:to="prof7"
  xlink:show="replace"
  xlink:actuate="onRequest"
  xlink:title="²Â-´µ±K¥q³Õ¤h¡M«ü¾É¦Ñ®v" />

5.1.4 ÂX®iÃì±µ¡N©w¦ì¾¹¡N¤Î©·ªº¼ÐÃD¡]title-Ãþ«¬¤¸¯À¡^

extended-¡Nlocator-¡N©M arc-Ãþ«¬¤¸¯À¥i¯à¦³ title Äݩʡ]§ó¦h«H®§°Ñ¨£5.5 »y¸qÄݩʡ]role¡Marcrole¡M©M title¡^¡^¡CµM¦Ó¡M¥L­Ì¤]¥i¯à¦³¤@³s¦êªº¤@­Ó©Î¦h­Óªº title-Ãþ«¬¤¸¯À¡C¨Ò¦p¡M¦b¤HÃþ¥iŪªº¼Ð¥Ü«H®§»Ý­n¶i¤@¨B¦a¤¸¯À¸m¼Ðªº±¡ªp¤U¡N©ÎªÌ¬O¦h­Ó¼ÐÃD¬O¥²»Ýªº±¡ªp¤U¡M³o¼Ëªº¤¸¯À«Ü¦³¥Îªº¡C¨Ï¥Î title-Ãþ«¬¤¸¯Àªº±`¨£ªº¤@­Ó°Ê¾÷¬O¬°¤F¸Ñ¨M°ê»Ú¤Æ©M¥»¦a¤Æªº°ÝÃD¡C¨Ò¦p¡M¼ÐÃD¸m¼Ð¥i¯à¹ïÂù¦V©Ê¤W¤U¤å©Î¬O¦bªF¨È»y¨¥¤¤¬O¥²»Ýªº¡M¦Ó¥B¦h­«¼ÐÃD¹ï¼ÐÃDªº¤£¦P¦ÛµM»y¨¥ª©¥»¥i¯à¬O¥²»Ýªº¡C

¥Î¤_¼ÐÃDªº XLink ¤¸¯À¬O¥ô¦ó¦³¤@­ÓÄÝ©ó XLink ©R¦WªÅ¶¡ªº¡N¥B¦W¬° type ­È¬° ¡§title¡¨ ªºÄݩʪº¤¸¯À¡C

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5.2 ²³æÃì±µ¡]simple-Ãþ«¬¤¸¯À¡^

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5.6.2 actuate ÄÝ©Ê

actuate ÄݩʥΨӶǹF±q¥Xµo¸ê·½¨ì²×¤î¸ê·½ªº¹C¾ú©Ò´Á±æªº®É¾÷¡C

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¿í±q XLink ªºÀ³¥Îµ{§ÇÀ³¸Ó¹ï actuate ­È¨Ï¥Î¤U¦Cªº³B²z¡R

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A.1 ¼Ð·Ç°Ñ¦Ò¸ê®Æ

IETF I-D XMT
XML Media Types. Makoto, M., St. Laurent, S. and D. Kohn, editors. Internet Engineering Task Force, 2001. (See http://www.ietf.org/rfc/rfc3023.txt.)
IETF RFC 2396
IETF (Internet Engineering Task Force). RFC 2396: Uniform Resource Identifiers. 1995. (See http://www.ietf.org/rfc/rfc2396.txt.)
IETF RFC 2279
RFC 2279: UTF-8, a transformation format of ISO 10646. Internet Engineering Task Force, 1998. (See http://www.ietf.org/rfc/rfc2279.txt.)
IETF RFC 2376
RFC 2376: XML Media Types. Internet Engineering Task Force, 1998. (See http://www.ietf.org/rfc/rfc2376.txt.)
IETF RFC 2732
RFC 2732: Format for Literal IPv6 Addresses in URL's. Internet Engineering Task Force, 1999. (See http://www.ietf.org/rfc/rfc2732.txt.)
XML
Tim Bray, Jean Paoli, C.M. Sperberg-McQueen, and Eve Maler, editors. Extensible Markup Language (XML) 1.0 (Second Edition). World Wide Web Consortium, 2000. (See http://www.w3.org/TR/2000/REC-xml-20001006.)
IETF RFC 2119
S. Bradner, editor. Key words for use in RFCs to Indicate Requirement Levels. March 1997. (See http://www.ietf.org/rfc/rfc2119.txt.)
XML Base
Jonathan Marsh, editor. XML Base (XBase). World Wide Web Consortium, 1999. (See http://www.w3.org/TR/2001/REC-xmlbase-20010627/.)
XML Names
Tim Bray, Dave Hollander, and Andrew Layman, editors. Namespaces in XML. World Wide Web Consortium, 1999. (See: http://www.w3.org/TR/1999/REC-xml-names-19990114/, See also: ¤¤¤å½Ķ [ÁcÅ餤¤å] ).

A.2 «D¼Ð·Ç°Ñ¦Ò¸ê®Æ

CHUM
Steven J. DeRose and David G. Durand. 1995. "The TEI Hypertext Guidelines." In Computing and the Humanities 29(3). Reprinted in Text Encoding Initiative: Background and Context, ed. Nancy Ide and Jean Ronis, ISBN 0-7923-3704-2.
Dexter
Halasz, Frank. 1994. ¡§The Dexter Hypertext Reference Model.¡¨ In Communications of the Association for Computing Machinery 37 (2), February 1994: 30-39.
FRESS
Steven J. DeRose and Andries van Dam. 1999. ¡§Document structure in the FRESS Hypertext System.¡¨ Markup Languages 1 (1) Winter. Cambridge: MIT Press: 7-32.¡]¥t°Ñ¬Ý http://www.stg.brown.edu/~sjd/fress.html for more information.)
HTML
HTML 4.01 Specification. World Wide Web Consortium, 1999. (See http://www.w3.org/TR/1999/REC-html401-19991224/.)
Intermedia
Yankelovich, Nicole, Bernard J. Haan, Norman K. Meyrowitz, and Steven M. Drucker. 1988. ¡§Intermedia: The Concept and the Construction of a Seamless Information Environment.¡¨ IEEE Computer 21 (January, 1988): 81-96.
ISO/IEC 10744
ISO (International Organization for Standardization). ISO/IEC 10744-1992 (E). Information technology-Hypermedia/Time-based Structuring Language (HyTime). [Geneva]: International Organization for Standardization, 1992. Extended Facilities Annex. [Geneva]: International Organization for Standardization, 1996. (See http://www.y12.doe.gov/sgml/wg8/document/1920.htm.)
MicroCosm
Hall, Wendy, Hugh Davis, and Gerard Hutchings. 1996. Rethinking Hypermedia: The Microcosm Approach. Boston: Kluwer Academic Publishers. ISBN 0-7923-9679-0.
OHS
van Ossenbruggen, Jacco, Anton Eliens and Lloyd Rutledge. ¡§The Role of XML in Open Hypermedia Systems.¡¨ Position paper for the 4th Workshop on Open Hypermedia Systems, ACM Hypertext '98. (See http://aue.auc.dk/~kock/OHS-HT98/Papers/ossenbruggen.html.)
RDF
Ora Lassila and Ralph Swick, editors. Resource Description Framework (RDF) Model and Syntax Specification. World Wide Web Consortium, 1999. (See http://www.w3.org/TR/1999/REC-rdf-syntax-19990222/.)
TEI
C. M. Sperberg-McQueen and Lou Burnard, editors.Guidelines for Electronic Text Encoding and Interchange. Association for Computers and the Humanities (ACH), Association for Computational Linguistics (ACL), and Association for Literary and Linguistic Computing (ALLC). Chicago, Oxford: Text Encoding Initiative, 1994.
XIS
John Cowan and Richard Tobin, editors. XML Information Set. World Wide Web Consortium, 2001. (See http://www.w3.org/TR/2001/CR-xml-infoset-20010514/.)
XLinkToRDF
Ron Daniel, editor. Harvesting RDF Statements from XLinks. World Wide Web Consortium, 2000. (See http://www.w3.org/TR/2000/NOTE-xlink2rdf-20000929/.)
XLinkNaming
Eve Maler, Daniel Veillard and Henry S. Thompson, editors. XLink Markup Name Control. World Wide Web Consortium, 2000. (See http://www.w3.org/TR/2000/NOTE-xlink-naming-20001220/.)
XInclude
Jonathan Marsh and David Orchard, editors. XML Inclusions (XInclude) Version 1.0. World Wide Web Consortium, 2000. (See http://www.w3.org/TR/2001/WD-xinclude-20010516/.)
XLREQ
Steven DeRose, editor. XML XLink Requirements Version 1.0.World Wide Web Consortium, 1999. (See http://www.w3.org/TR/1999/NOTE-xlink-req-19990224/.)
XLDP
Eve Maler and Steve DeRose, editors. XML Linking Language (XLink) Design Principles.World Wide Web Consortium, 1998. (See http://www.w3.org/TR/1998/NOTE-xlink-principles-19980303.)
XPTR
Ron Daniel, Steve DeRose, and Eve Maler, editors. XML Pointer Language (XPointer) V1.0.World Wide Web Consortium, 1998. (See http://www.w3.org/TR/2001/WD-xptr-20010108/.)

B DTD ¼Ë¥»¡]«D¼Ð·Ç¡^

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<!ELEMENT extended ((title|resource|locator|arc)*)>
<!ATTLIST extended
   xmlns:xlink     CDATA           #FIXED "http://www.w3.org/1999/xlink"
   xlink:type      (extended)      #FIXED "extended"
   xlink:role      CDATA           #IMPLIED
   xlink:title     CDATA           #IMPLIED>

<!ELEMENT title ANY>
<!-- xml:lang is not required, but provides much of the motivation
      for title elements in addition to attributes, and so is provided
      here for convenience -->
<!ATTLIST title
   xlink:type      (title)         #FIXED "title"
   xml:lang        CDATA           #IMPLIED>

<!ELEMENT resource ANY>
<!ATTLIST resource
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   xlink:role      CDATA           #IMPLIED
   xlink:title     CDATA           #IMPLIED
   xlink:label     NMTOKEN         #IMPLIED>

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<!-- label is not required, but locators have no particular XLink 
     function if they are not labeled -->
<!ATTLIST locator
   xlink:type      (locator)       #FIXED "locator"
   xlink:href      CDATA           #REQUIRED
   xlink:role      CDATA           #IMPLIED
   xlink:title     CDATA           #IMPLIED
   xlink:label     NMTOKEN         #IMPLIED>

<!ELEMENT arc (title*)>
<!-- from and to have default behavior when values are missing -->
<!ATTLIST arc
   xlink:type      (arc)           #FIXED "arc"
   xlink:arcrole   CDATA           #IMPLIED
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