X3D

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

Element Information

Model

head{0,1} , Scene
Children: Scene, head

Attributes

QName Type Fixed Default Use Inheritable Annotation
profile profileNames required
version x3dVersion required

Source 

<xs:element name="X3D">
  <xs:annotation>
    <xs:appinfo>
      <xs:element name="head" type="SFNode" default="head"/>
      <xs:element name="Scene" type="SFNode" default="Scene"/>
      <!-- provide default value for API; explicit definition still required for XML to avoid assumption errors -->
      <xs:attribute name="profile" type="profileNames" default="Immersive"/>
      <!-- provide default value for API; explicit definition still required for XML to avoid assumption e