Mismatched content type: Expected content of type variable1 and found variable2
The XPointer reference pointed to a binary node.
Either fix the reference to point at XML or text content, or replace the binary content with XML or textual content.
Malformed fallback: Required one fallback element and found variable1
An XPointer reference failed to refer to a document at all. In such cases an xi:fallback element is required, but none was found.
Add an xi:fallback element.
Circular XInclude references
An XInclude pointer references a node that includes the XInclude reference itself. Expanding such a circular reference would never end.
Fix the reference so that it does not refer to a node that contains itself.
Missing xpointer attribute: xpointer attribute required for parse=xml and empty href
An XInclude reference has parse=xml set and no href attribute. An xpointer attribute is required in order to dereference the inclusion, but none was given.
Add the required attribute.
The XInclude referenced a document node. This should not happen.
Modify the XInclude reference.