Custom Attribute class The is will be with reference to the http://customattrib.org namespace and will have
'customAttrib' as the name and the value will be a prefix and a suffix seperated with a colon see the
externalAnnotations.xsd for an example schema.
Custom Element class The is will be with reference to the http://customattrib.org namespace and will have
'customElt' as the name and the value will have two attributes , prefix and a suffix see the
externalAnnotationsElt.xsd for an example schema.
This method will test for when the documentation element of an annotation doesn't include a source
attribute or xml:lang attribute and doesn't contain any content.