[oXygen-user] Validation of Schema that Imports Multiple XSD Schemas

[Robert Leif]

Since my designs follow object-oriented design principles, my XSD schemas
import multiple XSD schemas, which provide and permit reuse of many of their
simpleTypes and complexTypes. The time for a successful validation of a
schema that solely imports 9 other schemas and does not have any data-type
or element definitions was in excess of 10 minutes. The subsequent
validation took 3 minutes. 2.66  out of 4 gigabytes of memory and 50% of the
CPU were used. I validated with Saxon-EE 9.4.0.3 for XSD1.1. 

I suspect that the problem is that Saxon validated all of the imported
schemas. Since these schemas had NOT been changed after their previous
validation, this was a total waste of time! Does Saxon have a tool to check
the time of the previous validation against the time of the last edit? If
not, it needs one. There is a potential problem when two schemas import each
other. In this case, it probably pays to validate both. A quick way to
ameliorate this problem is to extend the validation-well-formatted pull-down
to include Validate only this schema. Since a schema tree structure is
needed to perform an intelligent validation, it would be useful to make this
tree available to the user and to note if any of the imported schemas were
not being used.

Has anyone else observed similar long validation times with another
validator?

Thank you.

Yours truly,

Bob Leif

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