<xs:group name="ChildContentModelCore">
    <xs:annotation>
        <xs:appinfo>Child-node content model corresponding to X3DChildNode for Core profile.  ChildContentModelCore enables the first child of any node to be MetadataDouble, MetadataFloat, MetadataInteger, MetadataSet or MetadataString.</xs:appinfo>
        <xs:documentation />
    </xs:annotation>
    <xs:choice>
        <!-- empty -->
        <xs:element ref="MetadataDouble" />
        <xs:element ref="MetadataFloat" />
        <xs:element ref="MetadataInteger" />
        <xs:element ref="MetadataSet" />
        <xs:element ref="MetadataString" />
    </xs:choice>
</xs:group>