On Aug 19, 2004, at 10:30 AM, Donald Mennerich wrote: > E Namespace prefix marc has not been declared > MODS2MARC21slim.xsl file:/C:/xml/mods/MODS2MARC21slim.xsl It means your stylesheet needs a decalration for the marc namespace. It should look like xmlns:marc="http://www.example.com" Here's an example with MODS declared. <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:db="http://docbook.org/docbook-ng" xmlns:mods="http://www.loc.gov/mods/v3" xmlns="http://www.w3.org/1999/xhtml" exclude-result-prefixes="mods"> Bruce