Attempting to select multiple declarations or rules.

Additional Information

Element name is 'X', looking for rule of type 'Y'.
    where Y is either element, element #implied, data-content, external-entity or external-entity #implied.
    or
Element name is 'X', looking for declaration of type 'Y'.
    where Y is either insertion-break, replacement-break, marked-section cdata, marked-section rcdata, or marked-section ignore, or marked-section include-start, or marked-section include-end, or markup-comment.
    or
Conflicting rules found on the following lines: line X in file Y...

Explanation

The conditions on two or more rules that process parts of an markup document are true at one time, which is not allowed.

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