[UIMA-1817] xml namespace handling in XmiCasDocSerializer / NPE with Saxon in classpath

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3
• Fix Version/s: 2.3.1SDK
• Component/s: Core Java Framework

Environment

Java 1.6.0_20, Saxon9 jars on the classpath

• Assignee: Adam P. Lally
• Reporter: Martin Schaffoener
• Created: 23/Jun/10 06:24
• Updated: 30/Nov/10 16:26
• Resolved: 18/Jul/10 23:30

Description

While experimenting with UIMA I observed a problem similar to the one already posted here: http://tinyurl.com/32spzv9. Since removing Saxon from the classpath was not an option, I found the problem to be the way namespaces are handled in org.apache.uima.cas.impl.XmiCasSerializer$XmiCasDocSerializer.

First of all, the addAttribute/3 method was incorrectly passing null as uri and localName parameters. According to the javadoc, these must at least be empty strings. I added a hack to extract the localName from the qName, if available.

Second, the method computeNamespaceDeclarationAttrs/1 only added namespaces as attributes, which are not honored by Saxon. I think this is correct, as the SAX2 standard states that namespaces must be declared via startPrefixMapping/2, so I added that, as well.

Attached you find a patch with changes which work for me (and seem to solve the problem).