Rationalising @href

One of the problems with the schemas created for XHTML Modularization 1.1 is that attributes that play the same role in different places are not always rationalised. One example of this is the href attribute used on anchors and image maps, and another is the use of type on object, script and style.

In order to allow href to appear anyway in the document we need to remove it from the places where it is already set. We achieve this by creating replacements for xhtml-hypertext-1.xsd and xhtml-csismap-1.xsd in which any references to any of the attributes that have now been moved into the Common.attribs group, are dropped.