Thanks so much; these are very helpful. (In my case, they made it clear
I've been using <role> and <language> incorrectly, d'oh!) I noticed a
few minor problems:
* The attribute xlink:href is truncated in some places to just "xlink"
* I cannot find the ISO-3166 country codes at the site given in the
They are available, however, at
* In the Detailed Description, <identifier> and <dateCaptured> are
missing cross-references to the corresponding MARC fields.
* In the Detailed Description, the Z39.50 holdings schema example under
<extension> is not well-formed, missing "/" from some of the end tags.