cmis message

Subject: Re: [cmis] Nikunj's blog postings on AtomPub vs CMIS

From: Julian Reschke <julian.reschke@greenbytes.de>
To: Al Brown <albertcbrown@us.ibm.com>
Date: Thu, 14 May 2009 19:08:37 +0200

Al Brown wrote:
> Can you send me the atom & app as rng xml notation if you have the tools 
> set up?
> ...

Sure. All attached, but not checked.

BR, Julian

<?xml version="1.0" encoding="UTF-8"?>
<!-- -*- rnc -*-# RELAX NG Compact Syntax Grammar for the Atom Protocol -->
<grammar xmlns:app="http://www.w3.org/2007/app"; xmlns:atom="http://www.w3.org/2005/Atom"; xmlns:xhtml="http://www.w3.org/1999/xhtml"; xmlns:xsd="http://www.w3.org/2001/XMLSchema"; xmlns="http://relaxng.org/ns/structure/1.0"; datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes";>
  <start>
    <ref name="appService"/>
  </start>
  <!-- common:attrs -->
  <define name="atomURI">
    <text/>
  </define>
  <define name="appCommonAttributes">
    <optional>
      <attribute name="xml:base">
        <ref name="atomURI"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="xml:lang">
        <ref name="atomLanguageTag"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="xml:space">
        <choice>
          <value>default</value>
          <value>preserved</value>
        </choice>
      </attribute>
    </optional>
    <zeroOrMore>
      <ref name="undefinedAttribute"/>
    </zeroOrMore>
  </define>
  <define name="atomCommonAttributes">
    <ref name="appCommonAttributes"/>
  </define>
  <define name="undefinedAttribute">
    <attribute>
      <anyName>
        <except>
          <name>xml:base</name>
          <name>xml:space</name>
          <name>xml:lang</name>
          <nsName ns=""/>
        </except>
      </anyName>
    </attribute>
  </define>
  <define name="atomLanguageTag">
    <data type="string">
      <param name="pattern">([A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*)?</param>
    </data>
  </define>
  <define name="atomDateConstruct">
    <ref name="appCommonAttributes"/>
    <data type="dateTime"/>
  </define>
  <!-- app:service -->
  <define name="appService">
    <element name="app:service">
      <ref name="appCommonAttributes"/>
      <interleave>
        <oneOrMore>
          <ref name="appWorkspace"/>
        </oneOrMore>
        <zeroOrMore>
          <ref name="extensionElement"/>
        </zeroOrMore>
      </interleave>
    </element>
  </define>
  <!-- app:workspace -->
  <define name="appWorkspace">
    <element name="app:workspace">
      <ref name="appCommonAttributes"/>
      <interleave>
        <ref name="atomTitle"/>
        <zeroOrMore>
          <ref name="appCollection"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="extensionSansTitleElement"/>
        </zeroOrMore>
      </interleave>
    </element>
  </define>
  <define name="atomTitle">
    <element name="atom:title">
      <ref name="atomTextConstruct"/>
    </element>
  </define>
  <!-- app:collection -->
  <define name="appCollection">
    <element name="app:collection">
      <ref name="appCommonAttributes"/>
      <attribute name="href">
        <ref name="atomURI"/>
      </attribute>
      <interleave>
        <ref name="atomTitle"/>
        <zeroOrMore>
          <ref name="appAccept"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="appCategories"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="extensionSansTitleElement"/>
        </zeroOrMore>
      </interleave>
    </element>
  </define>
  <!-- app:categories -->
  <define name="atomCategory">
    <element name="atom:category">
      <ref name="atomCommonAttributes"/>
      <attribute name="term"/>
      <optional>
        <attribute name="scheme">
          <ref name="atomURI"/>
        </attribute>
      </optional>
      <optional>
        <attribute name="label"/>
      </optional>
      <ref name="undefinedContent"/>
    </element>
  </define>
  <define name="appInlineCategories">
    <element name="app:categories">
      <optional>
        <attribute name="fixed">
          <choice>
            <value>yes</value>
            <value>no</value>
          </choice>
        </attribute>
      </optional>
      <optional>
        <attribute name="scheme">
          <ref name="atomURI"/>
        </attribute>
      </optional>
      <group>
        <zeroOrMore>
          <ref name="atomCategory"/>
        </zeroOrMore>
        <ref name="undefinedContent"/>
      </group>
    </element>
  </define>
  <define name="appOutOfLineCategories">
    <element name="app:categories">
      <attribute name="href">
        <ref name="atomURI"/>
      </attribute>
      <ref name="undefinedContent"/>
    </element>
  </define>
  <define name="appCategories">
    <choice>
      <ref name="appInlineCategories"/>
      <ref name="appOutOfLineCategories"/>
    </choice>
  </define>
  <!-- app:accept -->
  <define name="appAccept">
    <element name="app:accept">
      <ref name="appCommonAttributes"/>
      <optional>
        <text/>
      </optional>
    </element>
  </define>
  <!-- Simple Extension -->
  <define name="simpleSansTitleExtensionElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2007/app"/>
          <name>atom:title</name>
        </except>
      </anyName>
      <text/>
    </element>
  </define>
  <define name="simpleExtensionElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2007/app"/>
        </except>
      </anyName>
      <text/>
    </element>
  </define>
  <!-- Structured Extension -->
  <define name="structuredSansTitleExtensionElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2007/app"/>
          <name>atom:title</name>
        </except>
      </anyName>
      <choice>
        <group>
          <oneOrMore>
            <attribute>
              <anyName/>
            </attribute>
          </oneOrMore>
          <zeroOrMore>
            <choice>
              <text/>
              <ref name="anyElement"/>
            </choice>
          </zeroOrMore>
        </group>
        <group>
          <zeroOrMore>
            <attribute>
              <anyName/>
            </attribute>
          </zeroOrMore>
          <group>
            <optional>
              <text/>
            </optional>
            <oneOrMore>
              <ref name="anyElement"/>
            </oneOrMore>
            <zeroOrMore>
              <choice>
                <text/>
                <ref name="anyElement"/>
              </choice>
            </zeroOrMore>
          </group>
        </group>
      </choice>
    </element>
  </define>
  <define name="structuredExtensionElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2007/app"/>
        </except>
      </anyName>
      <choice>
        <group>
          <oneOrMore>
            <attribute>
              <anyName/>
            </attribute>
          </oneOrMore>
          <zeroOrMore>
            <choice>
              <text/>
              <ref name="anyElement"/>
            </choice>
          </zeroOrMore>
        </group>
        <group>
          <zeroOrMore>
            <attribute>
              <anyName/>
            </attribute>
          </zeroOrMore>
          <group>
            <optional>
              <text/>
            </optional>
            <oneOrMore>
              <ref name="anyElement"/>
            </oneOrMore>
            <zeroOrMore>
              <choice>
                <text/>
                <ref name="anyElement"/>
              </choice>
            </zeroOrMore>
          </group>
        </group>
      </choice>
    </element>
  </define>
  <!-- Other Extensibility -->
  <define name="extensionSansTitleElement">
    <choice>
      <ref name="simpleSansTitleExtensionElement"/>
      <ref name="structuredSansTitleExtensionElement"/>
    </choice>
  </define>
  <define name="extensionElement">
    <choice>
      <ref name="simpleExtensionElement"/>
      <ref name="structuredExtensionElement"/>
    </choice>
  </define>
  <define name="undefinedContent">
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="anyForeignElement"/>
      </choice>
    </zeroOrMore>
  </define>
  <!-- Extensions -->
  <define name="anyElement">
    <element>
      <anyName/>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyElement"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="anyForeignElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2007/app"/>
        </except>
      </anyName>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyElement"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="atomPlainTextConstruct">
    <ref name="atomCommonAttributes"/>
    <optional>
      <attribute name="type">
        <choice>
          <value>text</value>
          <value>html</value>
        </choice>
      </attribute>
    </optional>
    <text/>
  </define>
  <define name="atomXHTMLTextConstruct">
    <ref name="atomCommonAttributes"/>
    <attribute name="type">
      <value>xhtml</value>
    </attribute>
    <ref name="xhtmlDiv"/>
  </define>
  <define name="atomTextConstruct">
    <choice>
      <ref name="atomPlainTextConstruct"/>
      <ref name="atomXHTMLTextConstruct"/>
    </choice>
  </define>
  <define name="anyXHTML">
    <element>
      <nsName ns="http://www.w3.org/1999/xhtml"/>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyXHTML"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="xhtmlDiv">
    <element name="xhtml:div">
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyXHTML"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
</grammar>
<!-- EOF -->


# -*- rnc -*-# RELAX NG Compact Syntax Grammar for the Atom Protocol

namespace app = "http://www.w3.org/2007/app";
namespace atom = "http://www.w3.org/2005/Atom";
namespace xsd = "http://www.w3.org/2001/XMLSchema";
namespace local = ""

start = appCategories

atomCommonAttributes =
   attribute xml:base { atomURI }?,
   attribute xml:lang { atomLanguageTag }?,
   undefinedAttribute*

undefinedAttribute = attribute * - (xml:base | xml:lang | local:*) {
  text }

atomURI = text

atomLanguageTag = xsd:string {
   pattern = "([A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*)?"
}


atomCategory =
    element atom:category {
       atomCommonAttributes,
       attribute term { text },
       attribute scheme { atomURI }?,
       attribute label { text }?,
       undefinedContent
    }

appInlineCategories =
    element app:categories {
        attribute fixed { "yes" | "no" }?,
        attribute scheme { atomURI }?,
        (atomCategory*,
        undefinedContent)
    }

appOutOfLineCategories =
    element app:categories {
        attribute href { atomURI },
        (empty)
    }

appCategories = appInlineCategories | appOutOfLineCategories


# Extensibility

undefinedContent = (text|anyForeignElement)*

anyElement =
   element * {
      (attribute * { text }
       | text
       | anyElement)*
   }

anyForeignElement =
    element * - atom:* {
       (attribute * { text }
        | text
        | anyElement)*
    }

# EOF


# -*- rnc -*-# RELAX NG Compact Syntax Grammar for the Atom Protocol

namespace app = "http://www.w3.org/2007/app";
namespace atom = "http://www.w3.org/2005/Atom";
namespace xsd = "http://www.w3.org/2001/XMLSchema";
namespace xhtml = "http://www.w3.org/1999/xhtml";
namespace local = ""

start = appService

# common:attrs

atomURI = text

appCommonAttributes =
   attribute xml:base { atomURI }?,
   attribute xml:lang { atomLanguageTag  }?,
   attribute xml:space {"default"|"preserved"}?,
   undefinedAttribute*


atomCommonAttributes = appCommonAttributes

undefinedAttribute = attribute * - (xml:base | xml:space  | xml:lang 
  | local:*) { text }

atomLanguageTag = xsd:string {
   pattern = "([A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*)?"
}

atomDateConstruct =
    appCommonAttributes,
    xsd:dateTime

# app:service

appService =
   element app:service {
      appCommonAttributes,
      ( appWorkspace+
        & extensionElement* )
   }

# app:workspace

appWorkspace =
   element app:workspace {
      appCommonAttributes,
      ( atomTitle
        & appCollection*
        & extensionSansTitleElement* )
   }

atomTitle = element atom:title { atomTextConstruct }

# app:collection

appCollection =
   element app:collection {
      appCommonAttributes,
      attribute href { atomURI  },
      ( atomTitle
        & appAccept*
        & appCategories*
        & extensionSansTitleElement* )
   }

# app:categories

atomCategory =
    element atom:category {
       atomCommonAttributes,
       attribute term { text },
       attribute scheme { atomURI }?,
       attribute label { text }?,
       undefinedContent
    }

appInlineCategories =
    element app:categories {
        attribute fixed { "yes" | "no" }?,
        attribute scheme { atomURI }?,
        (atomCategory*,
        undefinedContent)
    }

appOutOfLineCategories =
    element app:categories {
        attribute href { atomURI },
        undefinedContent
    }

appCategories = appInlineCategories | appOutOfLineCategories


# app:accept

appAccept =
   element app:accept {
         appCommonAttributes,
         ( text? )
   }

# Simple Extension

simpleSansTitleExtensionElement =
   element * - (app:*|atom:title) {
      text
   }

simpleExtensionElement =
   element * - (app:*) {
      text
   }


# Structured Extension

structuredSansTitleExtensionElement =
   element * - (app:*|atom:title) {
      (attribute * { text }+,
         (text|anyElement)*)
    | (attribute * { text }*,
       (text?, anyElement+, (text|anyElement)*))
   }

structuredExtensionElement =
   element * - (app:*) {
      (attribute * { text }+,
         (text|anyElement)*)
    | (attribute * { text }*,
       (text?, anyElement+, (text|anyElement)*))
   }

# Other Extensibility

extensionSansTitleElement =
 simpleSansTitleExtensionElement|structuredSansTitleExtensionElement


extensionElement = simpleExtensionElement |
   structuredExtensionElement

undefinedContent = (text|anyForeignElement)*

# Extensions

anyElement =
   element * {
      (attribute * { text }
       | text
       | anyElement)*
   }

anyForeignElement =
    element * - app:* {
       (attribute * { text }
        | text
        | anyElement)*
    }

atomPlainTextConstruct =
    atomCommonAttributes,
    attribute type { "text" | "html" }?,
    text

atomXHTMLTextConstruct =
    atomCommonAttributes,
    attribute type { "xhtml" },
    xhtmlDiv

atomTextConstruct = atomPlainTextConstruct | atomXHTMLTextConstruct

anyXHTML = element xhtml:* {
    (attribute * { text }
     | text
     | anyXHTML)*
}

xhtmlDiv = element xhtml:div {
  (attribute * { text }
   | text
   | anyXHTML)*
}

# EOF

<?xml version="1.0" encoding="UTF-8"?>
<!--
  -*- rnc -*-
  RELAX NG Compact Syntax Grammar for the
  Atom Format Specification Version 11
-->
<grammar 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";>
  <start>
    <choice>
      <ref name="atomFeed"/>
      <ref name="atomEntry"/>
    </choice>
  </start>
  <!-- Common attributes -->
  <define name="atomCommonAttributes">
    <optional>
      <attribute name="xml:base">
        <ref name="atomUri"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="xml:lang">
        <ref name="atomLanguageTag"/>
      </attribute>
    </optional>
    <zeroOrMore>
      <ref name="undefinedAttribute"/>
    </zeroOrMore>
  </define>
  <!-- Text Constructs -->
  <define name="atomPlainTextConstruct">
    <ref name="atomCommonAttributes"/>
    <optional>
      <attribute name="type">
        <choice>
          <value>text</value>
          <value>html</value>
        </choice>
      </attribute>
    </optional>
    <text/>
  </define>
  <define name="atomXHTMLTextConstruct">
    <ref name="atomCommonAttributes"/>
    <attribute name="type">
      <value>xhtml</value>
    </attribute>
    <ref name="xhtmlDiv"/>
  </define>
  <define name="atomTextConstruct">
    <choice>
      <ref name="atomPlainTextConstruct"/>
      <ref name="atomXHTMLTextConstruct"/>
    </choice>
  </define>
  <!-- Person Construct -->
  <define name="atomPersonConstruct">
    <ref name="atomCommonAttributes"/>
    <interleave>
      <element name="atom:name">
        <text/>
      </element>
      <optional>
        <element name="atom:uri">
          <ref name="atomUri"/>
        </element>
      </optional>
      <optional>
        <element name="atom:email">
          <ref name="atomEmailAddress"/>
        </element>
      </optional>
      <zeroOrMore>
        <ref name="extensionElement"/>
      </zeroOrMore>
    </interleave>
  </define>
  <!-- Date Construct -->
  <define name="atomDateConstruct">
    <ref name="atomCommonAttributes"/>
    <data type="dateTime"/>
  </define>
  <!-- atom:feed -->
  <define name="atomFeed">
    <element name="atom:feed">
      <s:rule context="atom:feed">
        <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>
      </s:rule>
      <ref name="atomCommonAttributes"/>
      <interleave>
        <zeroOrMore>
          <ref name="atomAuthor"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="atomCategory"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="atomContributor"/>
        </zeroOrMore>
        <optional>
          <ref name="atomGenerator"/>
        </optional>
        <optional>
          <ref name="atomIcon"/>
        </optional>
        <ref name="atomId"/>
        <zeroOrMore>
          <ref name="atomLink"/>
        </zeroOrMore>
        <optional>
          <ref name="atomLogo"/>
        </optional>
        <optional>
          <ref name="atomRights"/>
        </optional>
        <optional>
          <ref name="atomSubtitle"/>
        </optional>
        <ref name="atomTitle"/>
        <ref name="atomUpdated"/>
        <zeroOrMore>
          <ref name="extensionElement"/>
        </zeroOrMore>
      </interleave>
      <zeroOrMore>
        <ref name="atomEntry"/>
      </zeroOrMore>
    </element>
  </define>
  <!-- atom:entry -->
  <define name="atomEntry">
    <element name="atom:entry">
      <s:rule context="atom:entry">
        <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>
      </s:rule>
      <s:rule context="atom:entry">
        <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>
      </s:rule>
      <ref name="atomCommonAttributes"/>
      <interleave>
        <zeroOrMore>
          <ref name="atomAuthor"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="atomCategory"/>
        </zeroOrMore>
        <optional>
          <ref name="atomContent"/>
        </optional>
        <zeroOrMore>
          <ref name="atomContributor"/>
        </zeroOrMore>
        <ref name="atomId"/>
        <zeroOrMore>
          <ref name="atomLink"/>
        </zeroOrMore>
        <optional>
          <ref name="atomPublished"/>
        </optional>
        <optional>
          <ref name="atomRights"/>
        </optional>
        <optional>
          <ref name="atomSource"/>
        </optional>
        <optional>
          <ref name="atomSummary"/>
        </optional>
        <ref name="atomTitle"/>
        <ref name="atomUpdated"/>
        <zeroOrMore>
          <ref name="extensionElement"/>
        </zeroOrMore>
      </interleave>
    </element>
  </define>
  <!-- atom:content -->
  <define name="atomInlineTextContent">
    <element name="atom:content">
      <ref name="atomCommonAttributes"/>
      <optional>
        <attribute name="type">
          <choice>
            <value>text</value>
            <value>html</value>
          </choice>
        </attribute>
      </optional>
      <zeroOrMore>
        <text/>
      </zeroOrMore>
    </element>
  </define>
  <define name="atomInlineXHTMLContent">
    <element name="atom:content">
      <ref name="atomCommonAttributes"/>
      <attribute name="type">
        <value>xhtml</value>
      </attribute>
      <ref name="xhtmlDiv"/>
    </element>
  </define>
  <define name="atomInlineOtherContent">
    <element name="atom:content">
      <ref name="atomCommonAttributes"/>
      <optional>
        <attribute name="type">
          <ref name="atomMediaType"/>
        </attribute>
      </optional>
      <zeroOrMore>
        <choice>
          <text/>
          <ref name="anyElement"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="atomOutOfLineContent">
    <element name="atom:content">
      <ref name="atomCommonAttributes"/>
      <optional>
        <attribute name="type">
          <ref name="atomMediaType"/>
        </attribute>
      </optional>
      <attribute name="src">
        <ref name="atomUri"/>
      </attribute>
      <empty/>
    </element>
  </define>
  <define name="atomContent">
    <choice>
      <ref name="atomInlineTextContent"/>
      <ref name="atomInlineXHTMLContent"/>
      <ref name="atomInlineOtherContent"/>
      <ref name="atomOutOfLineContent"/>
    </choice>
  </define>
  <!-- atom:author -->
  <define name="atomAuthor">
    <element name="atom:author">
      <ref name="atomPersonConstruct"/>
    </element>
  </define>
  <!-- atom:category -->
  <define name="atomCategory">
    <element name="atom:category">
      <ref name="atomCommonAttributes"/>
      <attribute name="term"/>
      <optional>
        <attribute name="scheme">
          <ref name="atomUri"/>
        </attribute>
      </optional>
      <optional>
        <attribute name="label"/>
      </optional>
      <ref name="undefinedContent"/>
    </element>
  </define>
  <!-- atom:contributor -->
  <define name="atomContributor">
    <element name="atom:contributor">
      <ref name="atomPersonConstruct"/>
    </element>
  </define>
  <!-- atom:generator -->
  <define name="atomGenerator">
    <element name="atom:generator">
      <ref name="atomCommonAttributes"/>
      <optional>
        <attribute name="uri">
          <ref name="atomUri"/>
        </attribute>
      </optional>
      <optional>
        <attribute name="version"/>
      </optional>
      <text/>
    </element>
  </define>
  <!-- atom:icon -->
  <define name="atomIcon">
    <element name="atom:icon">
      <ref name="atomCommonAttributes"/>
      <ref name="atomUri"/>
    </element>
  </define>
  <!-- atom:id -->
  <define name="atomId">
    <element name="atom:id">
      <ref name="atomCommonAttributes"/>
      <ref name="atomUri"/>
    </element>
  </define>
  <!-- atom:logo -->
  <define name="atomLogo">
    <element name="atom:logo">
      <ref name="atomCommonAttributes"/>
      <ref name="atomUri"/>
    </element>
  </define>
  <!-- atom:link -->
  <define name="atomLink">
    <element name="atom:link">
      <ref name="atomCommonAttributes"/>
      <attribute name="href">
        <ref name="atomUri"/>
      </attribute>
      <optional>
        <attribute name="rel">
          <choice>
            <ref name="atomNCName"/>
            <ref name="atomUri"/>
          </choice>
        </attribute>
      </optional>
      <optional>
        <attribute name="type">
          <ref name="atomMediaType"/>
        </attribute>
      </optional>
      <optional>
        <attribute name="hreflang">
          <ref name="atomLanguageTag"/>
        </attribute>
      </optional>
      <optional>
        <attribute name="title"/>
      </optional>
      <optional>
        <attribute name="length"/>
      </optional>
      <ref name="undefinedContent"/>
    </element>
  </define>
  <!-- atom:published -->
  <define name="atomPublished">
    <element name="atom:published">
      <ref name="atomDateConstruct"/>
    </element>
  </define>
  <!-- atom:rights -->
  <define name="atomRights">
    <element name="atom:rights">
      <ref name="atomTextConstruct"/>
    </element>
  </define>
  <!-- atom:source -->
  <define name="atomSource">
    <element name="atom:source">
      <ref name="atomCommonAttributes"/>
      <interleave>
        <zeroOrMore>
          <ref name="atomAuthor"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="atomCategory"/>
        </zeroOrMore>
        <zeroOrMore>
          <ref name="atomContributor"/>
        </zeroOrMore>
        <optional>
          <ref name="atomGenerator"/>
        </optional>
        <optional>
          <ref name="atomIcon"/>
        </optional>
        <optional>
          <ref name="atomId"/>
        </optional>
        <zeroOrMore>
          <ref name="atomLink"/>
        </zeroOrMore>
        <optional>
          <ref name="atomLogo"/>
        </optional>
        <optional>
          <ref name="atomRights"/>
        </optional>
        <optional>
          <ref name="atomSubtitle"/>
        </optional>
        <optional>
          <ref name="atomTitle"/>
        </optional>
        <optional>
          <ref name="atomUpdated"/>
        </optional>
        <zeroOrMore>
          <ref name="extensionElement"/>
        </zeroOrMore>
      </interleave>
    </element>
  </define>
  <!-- atom:subtitle -->
  <define name="atomSubtitle">
    <element name="atom:subtitle">
      <ref name="atomTextConstruct"/>
    </element>
  </define>
  <!-- atom:summary -->
  <define name="atomSummary">
    <element name="atom:summary">
      <ref name="atomTextConstruct"/>
    </element>
  </define>
  <!-- atom:title -->
  <define name="atomTitle">
    <element name="atom:title">
      <ref name="atomTextConstruct"/>
    </element>
  </define>
  <!-- atom:updated -->
  <define name="atomUpdated">
    <element name="atom:updated">
      <ref name="atomDateConstruct"/>
    </element>
  </define>
  <!-- Low-level simple types -->
  <define name="atomNCName">
    <data type="string">
      <param name="minLength">1</param>
      <param name="pattern">[^:]*</param>
    </data>
  </define>
  <!-- Whatever a media type is, it contains at least one slash -->
  <define name="atomMediaType">
    <data type="string">
      <param name="pattern">.+/.+</param>
    </data>
  </define>
  <!-- As defined in RFC 3066 -->
  <define name="atomLanguageTag">
    <data type="string">
      <param name="pattern">[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*</param>
    </data>
  </define>
  <!--
    Unconstrained; it's not entirely clear how IRI fit into
    xsd:anyURI so let's not try to constrain it here
  -->
  <define name="atomUri">
    <text/>
  </define>
  <!-- Whatever an email address is, it contains at least one @ -->
  <define name="atomEmailAddress">
    <data type="string">
      <param name="pattern">.+@.+</param>
    </data>
  </define>
  <!-- Simple Extension -->
  <define name="simpleExtensionElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2005/Atom"/>
        </except>
      </anyName>
      <text/>
    </element>
  </define>
  <!-- Structured Extension -->
  <define name="structuredExtensionElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2005/Atom"/>
        </except>
      </anyName>
      <choice>
        <group>
          <oneOrMore>
            <attribute>
              <anyName/>
            </attribute>
          </oneOrMore>
          <zeroOrMore>
            <choice>
              <text/>
              <ref name="anyElement"/>
            </choice>
          </zeroOrMore>
        </group>
        <group>
          <zeroOrMore>
            <attribute>
              <anyName/>
            </attribute>
          </zeroOrMore>
          <group>
            <optional>
              <text/>
            </optional>
            <oneOrMore>
              <ref name="anyElement"/>
            </oneOrMore>
            <zeroOrMore>
              <choice>
                <text/>
                <ref name="anyElement"/>
              </choice>
            </zeroOrMore>
          </group>
        </group>
      </choice>
    </element>
  </define>
  <!-- Other Extensibility -->
  <define name="extensionElement">
    <choice>
      <ref name="simpleExtensionElement"/>
      <ref name="structuredExtensionElement"/>
    </choice>
  </define>
  <define name="undefinedAttribute">
    <attribute>
      <anyName>
        <except>
          <name>xml:base</name>
          <name>xml:lang</name>
          <nsName ns=""/>
        </except>
      </anyName>
    </attribute>
  </define>
  <define name="undefinedContent">
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="anyForeignElement"/>
      </choice>
    </zeroOrMore>
  </define>
  <define name="anyElement">
    <element>
      <anyName/>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyElement"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="anyForeignElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2005/Atom"/>
        </except>
      </anyName>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyElement"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <!-- XHTML -->
  <define name="anyXHTML">
    <element>
      <nsName ns="http://www.w3.org/1999/xhtml"/>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyXHTML"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="xhtmlDiv">
    <element name="xhtml:div">
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyXHTML"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
</grammar>
<!-- EOF -->


# -*- rnc -*-
# RELAX NG Compact Syntax Grammar for the
# Atom Format Specification Version 11

namespace atom = "http://www.w3.org/2005/Atom";
namespace xhtml = "http://www.w3.org/1999/xhtml";
namespace s = "http://www.ascc.net/xml/schematron";
namespace local = ""

start = atomFeed | atomEntry

# Common attributes

atomCommonAttributes =
   attribute xml:base { atomUri }?,
   attribute xml:lang { atomLanguageTag }?,
   undefinedAttribute*

# Text Constructs

atomPlainTextConstruct =
   atomCommonAttributes,
   attribute type { "text" | "html" }?,
   text

atomXHTMLTextConstruct =
   atomCommonAttributes,
   attribute type { "xhtml" },
   xhtmlDiv

atomTextConstruct = atomPlainTextConstruct | atomXHTMLTextConstruct

# Person Construct

atomPersonConstruct =
   atomCommonAttributes,
   (element atom:name { text }
    & element atom:uri { atomUri }?
    & element atom:email { atomEmailAddress }?
    & extensionElement*)

# Date Construct

atomDateConstruct=
   atomCommonAttributes,
   xsd:dateTime

# atom:feed

atomFeed =
   [
      s:rule [
         context = "atom:feed"
         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."
         ]
      ]
   ]
   element atom:feed {
      atomCommonAttributes,
      (atomAuthor*
       & atomCategory*
       & atomContributor*
       & atomGenerator?
       & atomIcon?
       & atomId
       & atomLink*
       & atomLogo?
       & atomRights?
       & atomSubtitle?
       & atomTitle
       & atomUpdated
       & extensionElement*),
      atomEntry*
   }

# atom:entry

atomEntry =
   [
      s:rule [
         context = "atom:entry"
         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:rule [
         context = "atom:entry"
         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."
         ]
      ]
   ]
   element atom:entry {
      atomCommonAttributes,
      (atomAuthor*
       & atomCategory*
       & atomContent?
       & atomContributor*
       & atomId
       & atomLink*
       & atomPublished?
       & atomRights?
       & atomSource?
       & atomSummary?
       & atomTitle
       & atomUpdated
       & extensionElement*)
   }

# atom:content

atomInlineTextContent =
   element atom:content {
      atomCommonAttributes,
      attribute type { "text" | "html" }?,
      (text)*
   }

atomInlineXHTMLContent =
   element atom:content {
      atomCommonAttributes,
      attribute type { "xhtml" },
      xhtmlDiv
   }

atomInlineOtherContent =
   element atom:content {
      atomCommonAttributes,
      attribute type { atomMediaType }?,
      (text|anyElement)*
   }

atomOutOfLineContent =
   element atom:content {
      atomCommonAttributes,
      attribute type { atomMediaType }?,
      attribute src { atomUri },
      empty
   }

atomContent = atomInlineTextContent
 | atomInlineXHTMLContent
 | atomInlineOtherContent
 | atomOutOfLineContent

# atom:author

atomAuthor = element atom:author { atomPersonConstruct }

# atom:category

atomCategory =
   element atom:category {
      atomCommonAttributes,
      attribute term { text },
      attribute scheme { atomUri }?,
      attribute label { text }?,
      undefinedContent
   }

# atom:contributor

atomContributor = element atom:contributor { atomPersonConstruct }

# atom:generator

atomGenerator = element atom:generator {
   atomCommonAttributes,
   attribute uri { atomUri }?,
   attribute version { text }?,
   text
}

# atom:icon

atomIcon = element atom:icon {
   atomCommonAttributes,
   (atomUri)
}

# atom:id

atomId = element atom:id {
   atomCommonAttributes,
   (atomUri)
}

# atom:logo

atomLogo = element atom:logo {
   atomCommonAttributes,
   (atomUri)
}

# atom:link

atomLink =
   element atom:link {
      atomCommonAttributes,
      attribute href { atomUri },
      attribute rel { atomNCName | atomUri }?,
      attribute type { atomMediaType }?,
      attribute hreflang { atomLanguageTag }?,
      attribute title { text }?,
      attribute length { text }?,
      undefinedContent
   }

# atom:published

atomPublished = element atom:published { atomDateConstruct}

# atom:rights

atomRights = element atom:rights { atomTextConstruct }

# atom:source

atomSource =
   element atom:source {
      atomCommonAttributes,
      (atomAuthor*
       & atomCategory*
       & atomContributor*
       & atomGenerator?
       & atomIcon?
       & atomId?
       & atomLink*
       & atomLogo?
       & atomRights?
       & atomSubtitle?
       & atomTitle?
       & atomUpdated?
       & extensionElement*)
   }

# atom:subtitle

atomSubtitle = element atom:subtitle { atomTextConstruct }

# atom:summary

atomSummary = element atom:summary { atomTextConstruct }

# atom:title

atomTitle = element atom:title { atomTextConstruct }

# atom:updated

atomUpdated = element atom:updated { atomDateConstruct }

# Low-level simple types

atomNCName = xsd:string { minLength = "1" pattern = "[^:]*" }

# Whatever a media type is, it contains at least one slash
atomMediaType = xsd:string { pattern = ".+/.+" }

# As defined in RFC 3066
atomLanguageTag = xsd:string {
   pattern = "[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*"
}

# Unconstrained; it's not entirely clear how IRI fit into
# xsd:anyURI so let's not try to constrain it here
atomUri = text

# Whatever an email address is, it contains at least one @
atomEmailAddress = xsd:string { pattern = ".+@.+" }

# Simple Extension

simpleExtensionElement =
   element * - atom:* {
      text
   }

# Structured Extension

structuredExtensionElement =
   element * - atom:* {
      (attribute * { text }+,
         (text|anyElement)*)
    | (attribute * { text }*,
       (text?, anyElement+, (text|anyElement)*))
   }

# Other Extensibility

extensionElement =
   simpleExtensionElement | structuredExtensionElement

undefinedAttribute =
  attribute * - (xml:base | xml:lang | local:*) { text }

undefinedContent = (text|anyForeignElement)*

anyElement =
   element * {
      (attribute * { text }
       | text
       | anyElement)*
   }

anyForeignElement =
   element * - atom:* {
      (attribute * { text }
       | text
       | anyElement)*
   }

# XHTML

anyXHTML = element xhtml:* {
   (attribute * { text }
    | text
    | anyXHTML)*
}

xhtmlDiv = element xhtml:div {
   (attribute * { text }
    | text
    | anyXHTML)*
}

# EOF

<?xml version="1.0" encoding="UTF-8"?>
<!-- -*- rnc -*-# RELAX NG Compact Syntax Grammar for the Atom Protocol -->
<grammar xmlns:app="http://www.w3.org/2007/app"; xmlns:atom="http://www.w3.org/2005/Atom"; xmlns:xsd="http://www.w3.org/2001/XMLSchema"; xmlns="http://relaxng.org/ns/structure/1.0"; datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes";>
  <start>
    <ref name="appCategories"/>
  </start>
  <define name="atomCommonAttributes">
    <optional>
      <attribute name="xml:base">
        <ref name="atomURI"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="xml:lang">
        <ref name="atomLanguageTag"/>
      </attribute>
    </optional>
    <zeroOrMore>
      <ref name="undefinedAttribute"/>
    </zeroOrMore>
  </define>
  <define name="undefinedAttribute">
    <attribute>
      <anyName>
        <except>
          <name>xml:base</name>
          <name>xml:lang</name>
          <nsName ns=""/>
        </except>
      </anyName>
    </attribute>
  </define>
  <define name="atomURI">
    <text/>
  </define>
  <define name="atomLanguageTag">
    <data type="string">
      <param name="pattern">([A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*)?</param>
    </data>
  </define>
  <define name="atomCategory">
    <element name="atom:category">
      <ref name="atomCommonAttributes"/>
      <attribute name="term"/>
      <optional>
        <attribute name="scheme">
          <ref name="atomURI"/>
        </attribute>
      </optional>
      <optional>
        <attribute name="label"/>
      </optional>
      <ref name="undefinedContent"/>
    </element>
  </define>
  <define name="appInlineCategories">
    <element name="app:categories">
      <optional>
        <attribute name="fixed">
          <choice>
            <value>yes</value>
            <value>no</value>
          </choice>
        </attribute>
      </optional>
      <optional>
        <attribute name="scheme">
          <ref name="atomURI"/>
        </attribute>
      </optional>
      <group>
        <zeroOrMore>
          <ref name="atomCategory"/>
        </zeroOrMore>
        <ref name="undefinedContent"/>
      </group>
    </element>
  </define>
  <define name="appOutOfLineCategories">
    <element name="app:categories">
      <attribute name="href">
        <ref name="atomURI"/>
      </attribute>
      <empty/>
    </element>
  </define>
  <define name="appCategories">
    <choice>
      <ref name="appInlineCategories"/>
      <ref name="appOutOfLineCategories"/>
    </choice>
  </define>
  <!-- Extensibility -->
  <define name="undefinedContent">
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="anyForeignElement"/>
      </choice>
    </zeroOrMore>
  </define>
  <define name="anyElement">
    <element>
      <anyName/>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyElement"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="anyForeignElement">
    <element>
      <anyName>
        <except>
          <nsName ns="http://www.w3.org/2005/Atom"/>
        </except>
      </anyName>
      <zeroOrMore>
        <choice>
          <attribute>
            <anyName/>
          </attribute>
          <text/>
          <ref name="anyElement"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
</grammar>
<!-- EOF -->

References:
- Re: [cmis] Nikunj's blog postings on AtomPub vs CMIS
  - From: Al Brown <albertcbrown@us.ibm.com>
- Re: [cmis] Nikunj's blog postings on AtomPub vs CMIS
  - From: Julian Reschke <julian.reschke@greenbytes.de>
- RE: [cmis] Nikunj's blog postings on AtomPub vs CMIS
  - From: Choy_David@emc.com
- Re: [cmis] Nikunj's blog postings on AtomPub vs CMIS
  - From: Al Brown <albertcbrown@us.ibm.com>
- Re: [cmis] Nikunj's blog postings on AtomPub vs CMIS
  - From: Julian Reschke <julian.reschke@greenbytes.de>
- Re: [cmis] Nikunj's blog postings on AtomPub vs CMIS
  - From: Al Brown <albertcbrown@us.ibm.com>