20. The method of claim 15 , wherein the validating comprises structuring the validation schema to provide for multiple inheritance.
15. A method of managing data for incorporation into content, the data described in a plurality of data models changeable over time, the method comprising: describing the data models in an ontology; providing a structure for the content using a semantic-independent schema that does not model the subject matter of the data; including in the content structure one or more data-centric components transformable to relate semantically to the ontology and configured to allow semantic-independent implementation of the content structure; transforming and semantically relating the one or more data-centric components to the ontology, the transforming and semantically relating performed using a validation schema derived from the ontology; and validating the transformed components relative to the ontology to validate the content.