form.rng

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<?xml version="1.0" encoding="UTF-8"?>
<!--
  Checks exclusions applying to form and basic-form modules.
  This schema is intended to be used in addition to xhtml.rng.
-->
<grammar ns="http://www.w3.org/1999/xhtml" xmlns="http://relaxng.org/ns/structure/1.0">
  <start>
    <ref name="normalElement"/>
  </start>
  <define name="normalElement">
    <element>
      <anyName>
        <except>
          <name>form</name>
          <name>label</name>
          <name>button</name>
        </except>
      </anyName>
      <ref name="normalContent"/>
    </element>
  </define>
  <define name="normalContent">
    <zeroOrMore>
      <choice>
        <ref name="normalElement"/>
        <ref name="formElement"/>
        <ref name="labelElement"/>
        <ref name="buttonElement"/>
        <ref name="anyAttribute"/>
        <text/>
      </choice>
    </zeroOrMore>
  </define>
  <define name="formElement">
    <element name="form">
      <ref name="formContent"/>
    </element>
  </define>
  <define name="formContent">
    <zeroOrMore>
      <choice>
        <element>
          <anyName>
            <except>
              <name>form</name>
              <name>label</name>
              <name>button</name>
            </except>
          </anyName>
          <ref name="formContent"/>
        </element>
        <ref name="labelElement"/>
        <ref name="buttonElement"/>
        <ref name="anyAttribute"/>
        <text/>
      </choice>
    </zeroOrMore>
  </define>
  <define name="labelElement">
    <element name="label">
      <ref name="labelContent"/>
    </element>
  </define>
  <define name="labelContent">
    <zeroOrMore>
      <choice>
        <element>
          <anyName>
            <except>
              <name>form</name>
              <name>label</name>
              <name>button</name>
            </except>
          </anyName>
          <ref name="labelContent"/>
        </element>
        <ref name="buttonElement"/>
        <ref name="anyAttribute"/>
        <text/>
      </choice>
    </zeroOrMore>
  </define>
  <define name="buttonElement">
    <element name="button">
      <ref name="buttonContent"/>
    </element>
  </define>
  <define name="buttonContent">
    <zeroOrMore>
      <choice>
        <element>
          <anyName>
            <except>
              <name>a</name>
              <name>input</name>
              <name>select</name>
              <name>textarea</name>
              <name>label</name>
              <name>button</name>
              <name>form</name>
              <name>isindex</name>
              <name>fieldset</name>
              <name>iframe</name>
            </except>
          </anyName>
          <ref name="buttonContent"/>
        </element>
        <ref name="anyAttribute"/>
        <text/>
      </choice>
    </zeroOrMore>
  </define>
  <define name="anyAttribute">
    <attribute>
      <anyName/>
    </attribute>
  </define>
</grammar>