rfc4287.rng

   1 <?xml version="1.0" encoding="UTF-8"?>
   2 <!--
   3   -*- rnc -*-
   4   RELAX NG Compact Syntax Grammar for the
   5   Atom Format Specification Version 11
   6   https://tools.ietf.org/html/rfc4287#appendix-B
   7 -->
   8 <grammar ns="http://www.w3.org/1999/xhtml" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:s="http://www.ascc.net/xml/schematron" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
   9   <start>
  10     <choice>
  11       <ref name="atomFeed"/>
  12       <ref name="atomEntry"/>
  13     </choice>
  14   </start>
  15   <!-- Common attributes -->
  16   <define name="atomCommonAttributes">
  17     <optional>
  18       <attribute name="xml:base">
  19         <ref name="atomUri"/>
  20       </attribute>
  21     </optional>
  22     <optional>
  23       <attribute name="xml:lang">
  24         <ref name="atomLanguageTag"/>
  25       </attribute>
  26     </optional>
  27     <zeroOrMore>
  28       <ref name="undefinedAttribute"/>
  29     </zeroOrMore>
  30   </define>
  31   <!-- Text Constructs -->
  32   <define name="atomPlainTextConstruct">
  33     <ref name="atomCommonAttributes"/>
  34     <optional>
  35       <attribute name="type">
  36         <choice>
  37           <value>text</value>
  38           <value>html</value>
  39         </choice>
  40       </attribute>
  41     </optional>
  42     <text/>
  43   </define>
  44   <define name="atomXHTMLTextConstruct">
  45     <ref name="atomCommonAttributes"/>
  46     <attribute name="type">
  47       <value>xhtml</value>
  48     </attribute>
  49     <ref name="xhtmlDiv"/>
  50   </define>
  51   <define name="atomTextConstruct">
  52     <choice>
  53       <ref name="atomPlainTextConstruct"/>
  54       <ref name="atomXHTMLTextConstruct"/>
  55     </choice>
  56   </define>
  57   <!-- Person Construct -->
  58   <define name="atomPersonConstruct">
  59     <ref name="atomCommonAttributes"/>
  60     <interleave>
  61       <element name="atom:name">
  62         <text/>
  63       </element>
  64       <optional>
  65         <element name="atom:uri">
  66           <ref name="atomUri"/>
  67         </element>
  68       </optional>
  69       <optional>
  70         <element name="atom:email">
  71           <ref name="atomEmailAddress"/>
  72         </element>
  73       </optional>
  74       <zeroOrMore>
  75         <ref name="extensionElement"/>
  76       </zeroOrMore>
  77     </interleave>
  78   </define>
  79   <!-- Date Construct -->
  80   <define name="atomDateConstruct">
  81     <ref name="atomCommonAttributes"/>
  82     <data type="dateTime"/>
  83   </define>
  84   <!-- atom:feed -->
  85   <define name="atomFeed">
  86     <element name="atom:feed">
  87       <s:rule context="atom:feed">
  88         <s:assert test="atom:author or not(atom:entry[not(atom:author)])">An atom:feed must have an atom:author unless all of its atom:entry children have an atom:author.</s:assert>
  89       </s:rule>
  90       <ref name="atomCommonAttributes"/>
  91       <interleave>
  92         <zeroOrMore>
  93           <ref name="atomAuthor"/>
  94         </zeroOrMore>
  95         <zeroOrMore>
  96           <ref name="atomCategory"/>
  97         </zeroOrMore>
  98         <zeroOrMore>
  99           <ref name="atomContributor"/>
 100         </zeroOrMore>
 101         <optional>
 102           <ref name="atomGenerator"/>
 103         </optional>
 104         <optional>
 105           <ref name="atomIcon"/>
 106         </optional>
 107         <ref name="atomId"/>
 108         <zeroOrMore>
 109           <ref name="atomLink"/>
 110         </zeroOrMore>
 111         <optional>
 112           <ref name="atomLogo"/>
 113         </optional>
 114         <optional>
 115           <ref name="atomRights"/>
 116         </optional>
 117         <optional>
 118           <ref name="atomSubtitle"/>
 119         </optional>
 120         <ref name="atomTitle"/>
 121         <ref name="atomUpdated"/>
 122         <zeroOrMore>
 123           <ref name="extensionElement"/>
 124         </zeroOrMore>
 125       </interleave>
 126       <zeroOrMore>
 127         <ref name="atomEntry"/>
 128       </zeroOrMore>
 129     </element>
 130   </define>
 131   <!-- atom:entry -->
 132   <define name="atomEntry">
 133     <element name="atom:entry">
 134       <s:rule context="atom:entry">
 135         <s:assert test="atom:link[@rel='alternate'] or atom:link[not(@rel)] or atom:content">An atom:entry must have at least one atom:link element with a rel attribute of 'alternate' or an atom:content.</s:assert>
 136
 137
 138       </s:rule>
 139       <s:rule context="atom:entry">
 140         <s:assert test="atom:author or ../atom:author or atom:source/atom:author">An atom:entry must have an atom:author if its feed does not.</s:assert>
 141
 142
 143       </s:rule>
 144       <ref name="atomCommonAttributes"/>
 145       <interleave>
 146         <zeroOrMore>
 147           <ref name="atomAuthor"/>
 148         </zeroOrMore>
 149         <zeroOrMore>
 150           <ref name="atomCategory"/>
 151         </zeroOrMore>
 152         <optional>
 153           <ref name="atomContent"/>
 154         </optional>
 155         <zeroOrMore>
 156           <ref name="atomContributor"/>
 157         </zeroOrMore>
 158         <ref name="atomId"/>
 159         <zeroOrMore>
 160           <ref name="atomLink"/>
 161         </zeroOrMore>
 162         <optional>
 163           <ref name="atomPublished"/>
 164         </optional>
 165         <optional>
 166           <ref name="atomRights"/>
 167         </optional>
 168         <optional>
 169           <ref name="atomSource"/>
 170         </optional>
 171         <optional>
 172           <ref name="atomSummary"/>
 173         </optional>
 174         <ref name="atomTitle"/>
 175         <ref name="atomUpdated"/>
 176         <zeroOrMore>
 177           <ref name="extensionElement"/>
 178         </zeroOrMore>
 179       </interleave>
 180     </element>
 181   </define>
 182   <!-- atom:content -->
 183   <define name="atomInlineTextContent">
 184     <element name="atom:content">
 185       <ref name="atomCommonAttributes"/>
 186       <optional>
 187         <attribute name="type">
 188           <choice>
 189             <value>text</value>
 190             <value>html</value>
 191           </choice>
 192         </attribute>
 193       </optional>
 194       <zeroOrMore>
 195         <text/>
 196       </zeroOrMore>
 197     </element>
 198   </define>
 199   <define name="atomInlineXHTMLContent">
 200     <element name="atom:content">
 201       <ref name="atomCommonAttributes"/>
 202       <attribute name="type">
 203         <value>xhtml</value>
 204       </attribute>
 205       <ref name="xhtmlDiv"/>
 206     </element>
 207   </define>
 208   <define name="atomInlineOtherContent">
 209     <element name="atom:content">
 210       <ref name="atomCommonAttributes"/>
 211       <optional>
 212         <attribute name="type">
 213           <ref name="atomMediaType"/>
 214         </attribute>
 215       </optional>
 216       <zeroOrMore>
 217         <choice>
 218           <text/>
 219           <ref name="anyElement"/>
 220         </choice>
 221       </zeroOrMore>
 222     </element>
 223   </define>
 224   <define name="atomOutOfLineContent">
 225     <element name="atom:content">
 226       <ref name="atomCommonAttributes"/>
 227       <optional>
 228         <attribute name="type">
 229           <ref name="atomMediaType"/>
 230         </attribute>
 231       </optional>
 232       <attribute name="src">
 233         <ref name="atomUri"/>
 234       </attribute>
 235       <empty/>
 236     </element>
 237   </define>
 238   <define name="atomContent">
 239     <choice>
 240       <ref name="atomInlineTextContent"/>
 241       <ref name="atomInlineXHTMLContent"/>
 242       <ref name="atomInlineOtherContent"/>
 243       <ref name="atomOutOfLineContent"/>
 244     </choice>
 245   </define>
 246   <!-- atom:author -->
 247   <define name="atomAuthor">
 248     <element name="atom:author">
 249       <ref name="atomPersonConstruct"/>
 250     </element>
 251   </define>
 252   <!-- atom:category -->
 253   <define name="atomCategory">
 254     <element name="atom:category">
 255       <ref name="atomCommonAttributes"/>
 256       <attribute name="term"/>
 257       <optional>
 258         <attribute name="scheme">
 259           <ref name="atomUri"/>
 260         </attribute>
 261       </optional>
 262       <optional>
 263         <attribute name="label"/>
 264       </optional>
 265       <ref name="undefinedContent"/>
 266     </element>
 267   </define>
 268   <!-- atom:contributor -->
 269   <define name="atomContributor">
 270     <element name="atom:contributor">
 271       <ref name="atomPersonConstruct"/>
 272     </element>
 273   </define>
 274   <!-- atom:generator -->
 275   <define name="atomGenerator">
 276     <element name="atom:generator">
 277       <ref name="atomCommonAttributes"/>
 278       <optional>
 279         <attribute name="uri">
 280           <ref name="atomUri"/>
 281         </attribute>
 282       </optional>
 283       <optional>
 284         <attribute name="version"/>
 285       </optional>
 286       <text/>
 287     </element>
 288   </define>
 289   <!-- atom:icon -->
 290   <define name="atomIcon">
 291     <element name="atom:icon">
 292       <ref name="atomCommonAttributes"/>
 293       <ref name="atomUri"/>
 294     </element>
 295   </define>
 296   <!-- atom:id -->
 297   <define name="atomId">
 298     <element name="atom:id">
 299       <ref name="atomCommonAttributes"/>
 300       <ref name="atomUri"/>
 301     </element>
 302   </define>
 303   <!-- atom:logo -->
 304   <define name="atomLogo">
 305     <element name="atom:logo">
 306       <ref name="atomCommonAttributes"/>
 307       <ref name="atomUri"/>
 308     </element>
 309   </define>
 310   <!-- atom:link -->
 311   <define name="atomLink">
 312     <element name="atom:link">
 313       <ref name="atomCommonAttributes"/>
 314       <attribute name="href">
 315         <ref name="atomUri"/>
 316       </attribute>
 317       <optional>
 318         <attribute name="rel">
 319           <choice>
 320             <ref name="atomNCName"/>
 321             <ref name="atomUri"/>
 322           </choice>
 323         </attribute>
 324       </optional>
 325       <optional>
 326         <attribute name="type">
 327           <ref name="atomMediaType"/>
 328         </attribute>
 329       </optional>
 330       <optional>
 331         <attribute name="hreflang">
 332           <ref name="atomLanguageTag"/>
 333         </attribute>
 334       </optional>
 335       <optional>
 336         <attribute name="title"/>
 337       </optional>
 338       <optional>
 339         <attribute name="length"/>
 340       </optional>
 341       <ref name="undefinedContent"/>
 342     </element>
 343   </define>
 344   <!-- atom:published -->
 345   <define name="atomPublished">
 346     <element name="atom:published">
 347       <ref name="atomDateConstruct"/>
 348     </element>
 349   </define>
 350   <!-- atom:rights -->
 351   <define name="atomRights">
 352     <element name="atom:rights">
 353       <ref name="atomTextConstruct"/>
 354     </element>
 355   </define>
 356   <!-- atom:source -->
 357   <define name="atomSource">
 358     <element name="atom:source">
 359       <ref name="atomCommonAttributes"/>
 360       <interleave>
 361         <zeroOrMore>
 362           <ref name="atomAuthor"/>
 363         </zeroOrMore>
 364         <zeroOrMore>
 365           <ref name="atomCategory"/>
 366         </zeroOrMore>
 367         <zeroOrMore>
 368           <ref name="atomContributor"/>
 369         </zeroOrMore>
 370         <optional>
 371           <ref name="atomGenerator"/>
 372         </optional>
 373         <optional>
 374           <ref name="atomIcon"/>
 375         </optional>
 376         <optional>
 377           <ref name="atomId"/>
 378         </optional>
 379         <zeroOrMore>
 380           <ref name="atomLink"/>
 381         </zeroOrMore>
 382         <optional>
 383           <ref name="atomLogo"/>
 384         </optional>
 385         <optional>
 386           <ref name="atomRights"/>
 387         </optional>
 388         <optional>
 389           <ref name="atomSubtitle"/>
 390         </optional>
 391         <optional>
 392           <ref name="atomTitle"/>
 393         </optional>
 394         <optional>
 395           <ref name="atomUpdated"/>
 396         </optional>
 397         <zeroOrMore>
 398           <ref name="extensionElement"/>
 399         </zeroOrMore>
 400       </interleave>
 401     </element>
 402   </define>
 403   <!-- atom:subtitle -->
 404   <define name="atomSubtitle">
 405     <element name="atom:subtitle">
 406       <ref name="atomTextConstruct"/>
 407     </element>
 408   </define>
 409   <!-- atom:summary -->
 410   <define name="atomSummary">
 411     <element name="atom:summary">
 412       <ref name="atomTextConstruct"/>
 413     </element>
 414   </define>
 415   <!-- atom:title -->
 416   <define name="atomTitle">
 417     <element name="atom:title">
 418       <ref name="atomTextConstruct"/>
 419     </element>
 420   </define>
 421   <!-- atom:updated -->
 422   <define name="atomUpdated">
 423     <element name="atom:updated">
 424       <ref name="atomDateConstruct"/>
 425     </element>
 426   </define>
 427   <!-- Low-level simple types -->
 428   <define name="atomNCName">
 429     <data type="string">
 430       <param name="minLength">1</param>
 431       <param name="pattern">[^:]*</param>
 432     </data>
 433   </define>
 434   <!-- Whatever a media type is, it contains at least one slash -->
 435   <define name="atomMediaType">
 436     <data type="string">
 437       <param name="pattern">.+/.+</param>
 438     </data>
 439   </define>
 440   <!-- As defined in RFC 3066 -->
 441   <define name="atomLanguageTag">
 442     <data type="string">
 443       <param name="pattern">[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*</param>
 444     </data>
 445   </define>
 446   <!--
 447     Unconstrained; it's not entirely clear how IRI fit into
 448     xsd:anyURI so let's not try to constrain it here
 449   -->
 450   <define name="atomUri">
 451     <text/>
 452   </define>
 453   <!-- Whatever an email address is, it contains at least one @ -->
 454   <define name="atomEmailAddress">
 455     <data type="string">
 456       <param name="pattern">.+@.+</param>
 457     </data>
 458   </define>
 459   <!-- Simple Extension -->
 460   <define name="simpleExtensionElement">
 461     <element>
 462       <anyName>
 463         <except>
 464           <nsName ns="http://www.w3.org/2005/Atom"/>
 465         </except>
 466       </anyName>
 467       <text/>
 468     </element>
 469   </define>
 470   <!-- Structured Extension -->
 471   <define name="structuredExtensionElement">
 472     <element>
 473       <anyName>
 474         <except>
 475           <nsName ns="http://www.w3.org/2005/Atom"/>
 476         </except>
 477       </anyName>
 478       <choice>
 479         <group>
 480           <oneOrMore>
 481             <attribute>
 482               <anyName/>
 483             </attribute>
 484           </oneOrMore>
 485           <zeroOrMore>
 486             <choice>
 487               <text/>
 488               <ref name="anyElement"/>
 489             </choice>
 490           </zeroOrMore>
 491         </group>
 492         <group>
 493           <zeroOrMore>
 494             <attribute>
 495               <anyName/>
 496             </attribute>
 497           </zeroOrMore>
 498           <group>
 499             <optional>
 500               <text/>
 501             </optional>
 502             <oneOrMore>
 503               <ref name="anyElement"/>
 504             </oneOrMore>
 505             <zeroOrMore>
 506               <choice>
 507                 <text/>
 508                 <ref name="anyElement"/>
 509               </choice>
 510             </zeroOrMore>
 511           </group>
 512         </group>
 513       </choice>
 514     </element>
 515   </define>
 516   <!-- Other Extensibility -->
 517   <define name="extensionElement">
 518     <choice>
 519       <ref name="simpleExtensionElement"/>
 520       <ref name="structuredExtensionElement"/>
 521     </choice>
 522   </define>
 523   <define name="undefinedAttribute">
 524     <attribute>
 525       <anyName>
 526         <except>
 527           <name>xml:base</name>
 528           <name>xml:lang</name>
 529           <nsName ns=""/>
 530         </except>
 531       </anyName>
 532     </attribute>
 533   </define>
 534   <define name="undefinedContent">
 535     <zeroOrMore>
 536       <choice>
 537         <text/>
 538         <ref name="anyForeignElement"/>
 539       </choice>
 540     </zeroOrMore>
 541   </define>
 542   <define name="anyElement">
 543     <element>
 544       <anyName/>
 545       <zeroOrMore>
 546         <choice>
 547           <attribute>
 548             <anyName/>
 549           </attribute>
 550           <text/>
 551           <ref name="anyElement"/>
 552         </choice>
 553       </zeroOrMore>
 554     </element>
 555   </define>
 556   <define name="anyForeignElement">
 557     <element>
 558       <anyName>
 559         <except>
 560           <nsName ns="http://www.w3.org/2005/Atom"/>
 561         </except>
 562       </anyName>
 563       <zeroOrMore>
 564         <choice>
 565           <attribute>
 566             <anyName/>
 567           </attribute>
 568           <text/>
 569           <ref name="anyElement"/>
 570         </choice>
 571       </zeroOrMore>
 572     </element>
 573   </define>
 574   <!-- XHTML -->
 575   <define name="anyXHTML">
 576     <element>
 577       <nsName/>
 578       <zeroOrMore>
 579         <choice>
 580           <attribute>
 581             <anyName/>
 582           </attribute>
 583           <text/>
 584           <ref name="anyXHTML"/>
 585         </choice>
 586       </zeroOrMore>
 587     </element>
 588   </define>
 589   <define name="xhtmlDiv">
 590     <element name="xhtml:div">
 591       <zeroOrMore>
 592         <choice>
 593           <attribute>
 594             <anyName/>
 595           </attribute>
 596           <text/>
 597           <ref name="anyXHTML"/>
 598         </choice>
 599       </zeroOrMore>
 600     </element>
 601   </define>
 602 </grammar>
 603 <!-- EOF -->