I'm having trouble using XHTML generated by TinyMCE in a BaseX database. I get the error: The entity "nbsp" was referenced, but not declared. OK, I understand that it doesn't parse entities automatically. I need to add a DTD. So I have a setup like this: In a file called catalog.xml: <?xml version="1.0"?> <catalog prefer="system" xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"> <rewriteSystem systemIdStartString="http://www.w3.org/TR/xhtml1/DTD/" rewritePrefix="file:///var/www/xxx/content/dtds/" /> </catalog> In /var/www/xxx/content/dtds/ I have a file called xhtml1-strict.dtd which is exactly what it says it is (downloaded from the W3C). Now I need to add the DOCTYPE to my database. But how? I create this database via a web interface using Vaadin (a bunch of forms, tables, etc. Then I just do XQuery inserts, deletes, etc. There are no XML documents. It's all done piecemeal. My root node is <data>. Some of my nodes have a <content> node that contains XHTML: <data> <remarks> <remark id='1'> <name>Test Remark</name> <content> <p>This contains a non-breaking space!</p> </content> </remark> </remarks> </data> How do I add the DTD? How do I indicate that it should be applied to the contents of the <content> node only? How can I do that without adding namespaces to all the XHTML tags? Can anyone provide a brief example? By the way, when I connect to the database I do this: val session = new ClientSession("localhost", 1984, "admin", "x") session.setOutputStream(System.out) session.execute("SET CATFILE /var/www/xxx/catalog.xml") session.execute("SET CHOP off") session.execute("SET INTPARSE on") session.execute("SET ENTITY on") session.execute("SET PATHINDEX on") session.execute("SET TEXTINDEX on") session.execute("SET ATTRINDEX on") session.execute("SET FTINDEX on") session.execute("SET WILDCARDS on") session.execute("SET DIACRITICS on") session.execute("INFO") Thanks! Chas.