I am attempting to compare the values in one node with the preceding node....
self::node()[not(text()=preceding-sibling::node()/text())]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This expression will be true if at least one text node child of the context node is equal to at least one text node child of any of the preceding siblings of the context node. If you want to compare to the immediatly preceding sibling only, use text()=preceding-sibling::node()[1]/text() instead. Also this may or may not do what you want if the nodes in question have multiple text node children (may happen if they have mixed content). You'll probably want to use the folllowing form, which compares the string values of the nodes instead of the text node children: .=preceding-sibling::node()[1]
Node comparision in XSLT are tricky until you get a grasp on working with sets (somewhat similar to SQL).
Note further that this is a pure XSLT question, which would have better been asked on the XSLT list:
http://www.mulberrytech.com/xsl/xsl-list/
J.Pietschmann
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