Hi. When I was writing Merb app which does XML Schema validation with LibXML 2.7.3, global error handler registerd on XML::Error is never callbacked even if validation was failed. I tried to add a code which re-register error handler to Libxml whenever XML::Error.set_handler is called. It seems works well, error handler can be callbacked.
This is strange sinse simple XML Schema validation script works no problem on global error callback, but inside Merb app, this trouble occured... It may be multi-thread issue which Merb framework works as. (Of course I use Mutex to synchronize libxml access.) At first, I was tried to use block with XML::Document#validate_schema, but callback was never invoked when validation was failed. I spent a half of day to fix it with involiving LibXML C-APIs, but I couldn't, I decided to use global XML error handler. Trouble with the block for validate_schema is occured even minimum test script, so I gave it up. Also I found XML::Error#domain_to_s doesn't work, this patch includes additional constants for XML::Error.
libxml-ruby-0.9.8.error_handler.patch
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