Problem with SMIL 2.0 schema?

It appears that the schema is out of whack with both the SMIL and HTML 
DTDs, each of which indicate nohref="nohref" rather than ="true | 
false".   Should this inconsistency in the schema be referenced in the 
errata?
SMIL 2.0 Schemas, which is informative,indicates:
(http://www.w3.org/TR/smil20/smil-SCHEMA.html)

  <attribute name="nohref" type="boolean" use="optional"  default="false"/>

while

SMIL 2.0 DTD, indicates:
(http://www.w3.org/TR/smil20/smil-DTD.html)
<!ENTITY % SMIL.area.attrib  "">
                ...
                   nohref                    (nohref)            #IMPLIED
...
                 >

The Linking Module indicates:
nohref
                   When set, this Boolean attribute specifies that the 
region has no associated link, even if other area elements for the media 
object define links for it.

However the values & default are not indicated here.

HTML specification indicates:
http://www.w3.org/TR/REC-html32

<!ELEMENT AREA - O EMPTY>
...
     nohref (nohref) #IMPLIED  -- this region has no action --
...
     >

and

XHTML indicates:
http://www.w3schools.com/xhtml/xhtml_syntax.asp

nohref="nohref"

Thanks,
Robin

robinh@real.com