From: Richard Karnesky
>   http://listserv.loc.gov/cgi-bin/wa?A2=ind0610&L=MODS&P=R2275&I=-3
> for example.


Ok, thanks. Looking at that message, it suggests:
_________________________________________________________
You just have to change the definition of <extent> under
<physicalDescription> from

<xsd:element name="extent" type="xsd:string"/>

to

<xsd:element name="extent" type="extentType"/>

like it is defined under <part>.
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Unfortunately that was not something that could have been done with a minor
release -  e.g. 3.2 to 3.3 - it would have required a major version change,
because it would change the existing definition from a simple string to a
structured element with subelements. 

 But the suggestion to simply add a unit attribute to  extent under
physicalDescription would be possible with a minor version change. I'll pass
that suggestion along to the Editorial Board. 

--Ray