XML Schema Design - <xs:documentation> source attribute value

[dreamhack]

I have been asked to document an XML Schema file. I am required to include business and technical descriptions for each of the schema elements. Looking at our guidelines and the W3C XML Schema recommendation, I find myself wondering what exactly the best practice would be.Our guidelines state that the annotation tag should have the following format: \[code\]<xs:annotation> <xs:documentation source="BusinessDescription">This is the business description</xs:documentation> <xs:documentation source="TechnicalDescription">This is the business description</xs:documentation></xs:annotation>\[/code\]The XML recommendation states that the source attribute should be of type "xs:anyURI". Obviously "BuinessDescription" and "TechnicalDescription" are not URI's and will be repeated numerous throughout the schema. Therefore, is it really correct to use the source attribute as a semantic attribute? In XML Schema http://shop.oreilly.com/product/9780596002527.do Eric van der Vlist suggests that this is acceptable but also contradicts this view by stating that it could lead to interoperability issues.