Connection is not open.
Context is %NULL. Should not be %NULL for normal operation.
#xmlDocPtr is %NULL.
Sets if xml file is not readable
Sets if the used schema is invalid.
Sets if xml check fails. Xml file structure doesn't match with DTD file
Sets if parsing reports an error
If set, error with parse chunk algorithm.
Sets if an error with context during parsing an xml file
Sets if server operation is %NULL.
These error are primary for developers to troubleshoot the problem rather than for user.