[x3d-public] x3d.py head field declarations question

[John Carlson]

 From x3d.py:

class head(_X3DStatement):
"""
    Functional summary: each X3D scene includes a head statement that 
can contain component, unit and meta statements.
    """

[snip]
defFIELD_DECLARATIONS(self):
''' Field declarations for this node: name, defaultValue, type, 
accessType, inheritedFrom '''
return[('children', None, FieldType.MFNode, AccessType.inputOutput, 'head')]

=======================================================================================================

What I don't understand is, why is inheritedFrom "'head'" in the above code?

Also, why do these below fields from X3DUOM not appear in 
FIELD_DECLARATIONS?

<field name="class"
type="SFString"
accessType="inputOutput"
inheritedFrom="X3DStatement"
baseType="xs:NMTOKENS"
description="The class attribute on each X3D node and statement is a 
space-separated list of classes, reserved for use by Cascading St
yle Sheets (CSS) and XML stylesheets."/>
<field name="component"
type="MFNode"
accessType="inputOutput"
acceptableNodeTypes="component"
description="Add component statements to indicate necessary scene 
functionality above the given profile for this X3D model."/>
<field name="id"
type="SFString"
accessType="inputOutput"
inheritedFrom="X3DStatement"
baseType="xs:NMTOKEN"
description="The id attribute on each X3D node and statement is 
considered a unique identifier when used as part of an encompassing HT
ML/DOM context."/>
<field name="meta"
type="MFNode"
accessType="inputOutput"
acceptableNodeTypes="meta"
description="Add meta statements to provide metadata information about 
this X3D model."/>
<field name="style"
type="SFString"
accessType="inputOutput"
inheritedFrom="X3DStatement"
description="The style attribute on each X3D node and statement provides 
an inline block of CSS source for element styling, reserved f
or use by Cascading Style Sheets (CSS) and XML stylesheets."/>
<field name="unit"
type="MFNode"
accessType="inputOutput"
acceptableNodeTypes="unit"
description="Add unit statements to define data-conversion factors for 
typed values defined within a scene."/>
<ContentModel>

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