Improve validation schema loading [SWS-46]

[gregturn]

Arjen Poutsma opened SWS-46 and commented

See http://forum.springframework.org/showpost.php?p=67520&postcount=8:

The validation schema could be improved.

• Use the resource's URL as a system ID, if available.
• The Jaxp10Validator should not rely on a File being present, but use the available inputstream instead.

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Affects: 1.0 M1