SAML test cases are not valid XML #37
Description
The test cases in src/xmlsec/test/data/signverify/SAML_assertion1 and src/xmlsec/test/data/signverify/SAML_assertion_sha256 uses an ID value that is entirely numeric. XML IDs must not start with a number: https://www.w3.org/TR/REC-xml/#sec-attribute-types https://www.w3.org/TR/REC-xml/#NT-Name