util: check for an illegal character in a XML namespace prefix
When user tries to insert element metadata providing a namespace declaration as well, currently we insert the element without any validation check for XML prefix (if provided). The next VM start would then fail with parse error. This patch fixes this issue by adding a call to xmlValidateNCName function to check for illegal characters in the prefix. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1143921
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