SVRL should have a svrl:metadata element

[dmj]

Currently the only way to add metadata e.g. about the validation process (timestamp, product etc.) is to wrap it in a svrl:text element or use comments. SVRL should provide an optional repetable svrl:metadata element that can be used to provide metadata.

Example using Dublin Core Metadata Terms:

<svrl:schematron-output xmlns:svrl="http://purl.oclc.org/dsdl/svrl" xmlns:dct="http://purl.org/dc/terms/">
  <svrl:metadata>
    <dct:created>2019-09-09T01:23:45Z</dct:created>
    <dct:creator>SchXslt 1.3 using Saxon HE 9.8</dct:creator>
  <svrl:metadata>
</svrl:schematron-output>