ProtoInterface

http://www.web3d.org/documents/specifications/19776-1/V3.3/Part01/concepts.html#PrototypeAndFieldDeclarationSyntax

Element Information

Model

field*
Children: field

Used By

Element ProtoDeclare

Source 

<xs:element name="ProtoInterface">
  <xs:annotation>
    <xs:appinfo>
      <xs:element name="field" type="MFNode" default="field"/>
      <xs:attribute name="componentName" type="xs:NMTOKEN" fixed="Core"/>
      <xs:attribute name="componentLevel" type="xs:positiveInteger" fixed="2"/>ProtoInterface defines fields for new Prototype nodes.</xs:appinfo>
    <xs:documentation source="http://www.web3d.org/documents/specifications/19776-1/V3.3/Part01/concepts.html#PrototypeAndFieldDeclarationSyntax"/>
  </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="SceneGraphStructureStatement">
        <xs:sequence>
          <xs:element ref="field" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

Sample