Message
@contrib-type value should be one of "author", "editor", "guest-editor", "translator", "column-editor", "reviewing-editor", or "collaborator"
Rule XPath:
This rule ASSERTS the following, raising an alert if FALSE:
@contrib-type = ('author', 'editor', 'guest-editor', 'translator', 'column-editor',
'reviewing-editor', 'collaborator')