<!-- ==============================================================      SVG12-RNG | SVG 1.2 Conditional     ============================================================== --><grammar ns='http://www.w3.org/2000/svg'         xml:lang='en'         xmlns='http://relaxng.org/ns/structure/1.0'         xmlns:xlink='http://www.w3.org/1999/xlink'         xmlns:ev='http://www.w3.org/2001/xml-events'         xmlns:a='http://relaxng.org/ns/compatibility/annotations/1.0'         xmlns:svg='http://www.w3.org/2005/02/svg-annotations'         datatypeLibrary='http://www.w3.org/2001/XMLSchema-datatypes'         >  <!--    The 'switch' is not defined here, only its attributes are, alongside    the test attributes that may be used to express conditions on subtrees.    The reason for this is because 'switch' has a content model that is    equivalent to the content model of the element that contains it. It is    therefore defined everywhere that it is allowable.    -->  <define name='svg.Conditional.attr' combine='interleave'>    <optional>      <attribute name='requiredFeatures' svg:animatable='false' svg:inheritable='false'>        <ref name='ListOfIRI.datatype'/>      </attribute>    </optional>    <optional>      <attribute name='requiredExtensions' svg:animatable='false' svg:inheritable='false'>        <ref name='ListOfIRI.datatype'/>      </attribute>    </optional>    <optional>      <attribute name='requiredFormats' svg:animatable='false' svg:inheritable='false'>        <ref name='FormatList.datatype'/>      </attribute>    </optional>    <optional>      <attribute name='requiredFonts' svg:animatable='false' svg:inheritable='false'>        <ref name='FontList.datatype'/>      </attribute>    </optional>    <optional>      <attribute name='systemLanguage' svg:animatable='false' svg:inheritable='false'>        <ref name='LanguageIDs.datatype'/>      </attribute>    </optional>  </define>  <!-- ... switch's attributes .................................... -->  <define name='switch.AT' combine='interleave'>    <ref name='svg.Core.attr'/>    <ref name='svg.Conditional.attr'/>    <ref name='svg.Properties.attr'/>    <ref name='svg.FocusHighlight.attr'/>    <ref name='svg.External.attr'/>    <ref name='svg.Transform.attr'/>    <ref name='svg.Focus.attr'/>  </define></grammar>