Section 4 of the xml:id specification says the normalized value of the attribute is an NCName and contains links to the NCName definitions for XML 1.0 and XML 1.1. The XML 1.0 definition is easier to understand, but the XML 1.1 definition is more complete. They're not equivalent; you should use IDs that conform to the specification for whichever version of XML you're using. The restrictions on ID names are fundamental to XML. Any decent introduction to XML should cover them, along with other stuff one simply has to know. -----Original Message----- From: oxygen-user-bounces@oxygenxml.com [mailto:oxygen-user-bounces@oxygenxml.com] On Behalf Of Robert Nagle Sent: Monday, June 29, 2009 1:26 PM To: Jirka Kosek Cc: oxygen-user@oxygenxml.com Subject: Re: [oXygen-user] xml:id + docbook5 validation problems Jirka, This is amazingly useful and nonobvious information. I never would have thought of this mistake. Thank you. I looked at the spec for xml:id and I cannot seem to find a reference to this requirement. Perhaps I am not understanding a concept or terminology used on the spec page. http://www.w3.org/TR/xml-id/ For future reference, how would I know about a requirement on an attribute value like this one? Robert Ngle 2009/6/28 Jirka Kosek <jirka@kosek.cz>:
Robert Nagle wrote:
SystemID: I:\My Documents\xml\rj3\er1.xml Engine name: oNVDL Severity: error Description: bad value for attribute "id" from namespace "http://www.w3.org/XML/1998/namespace" Start location: 2:80
******************************* here is what I have in the er1.xml file:
<?xml version="1.0" encoding="UTF-8"?> <chapter xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="99er1">
IDs must start with letter (or underscore and few other characters) but not with number. This is cause of your error.
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