The XML Schema worldview
- Validity and well-formedness are XML 1.0 concepts.
- They are defined over character sequences.
- Namespace-compliant is a Namespace concept.
- It's defined over character sequences too.
- Schema-validity assessment is the XML Schema concept.
- It is defined in terms of XML document Infosets.
- So the whole XML Schema exercise is predicated on and layered on top of
XML 1.0 well-formedness plus Namespaces.
- Because they are constitutive of the Infoset.
