From: "Matthew Gertner" <>
> That said, you led me down the garden path with this PSVI stuff. My
> understanding of the PSVI (very shaky, I admit) is that it is an abstract
> formalism for representing an instance with its associated schema.
A Post-Schema Validation Infoset (instance) is an XML Infoset (instance)
that has been augmented with information as a result of being
validated by a W3C XML Schema (schema).
This information could include, among other things,
- defaulted values
- type information
- whether validation was attempted, and whether it was successful
A PSVI does not necessarily conform to a schema. The augmentations
as a result of schema processing could be that some elements
are invalid. (This is why optimizing away "impossible paths" should
be an application-dependent thing, or a distinction between XQuery
and XPath2. An application may be interested in part that are invalid
in order to repair them, report them, or complete the document.)
A PSVI can be constructed in several ways, not merely by running
the same schema on the whole document at the same time.
Cheers
Rick Jelliffe
