You can get the "XML schema learner" from my Github account: https://github.com/kore/XML-Schema-learner. Just clone it, and you can run the tests, or use the learn command to infer XML schemas from XML data.

He includes an example XML definition and the resulting DTD that the tool generates from it, defining each of the elements and attributes each can have. The tool can then take this DTD file and generate an XSD file, creating complex and simple types that match the original data.

Recently I had to compose some XML documents that needed to be validated with XSDs. All fine of course, but I had some problem with two date/time fields that according to the XSD were supposed to be xs:dateTime fields. Googling around I found a lot of references to the ISO8601 format, so I decided to format my date using the DATE_ISO8601 constant. That did not work though.

David's suggestion was to use "date('c')" (the full ISO 8601 date) instead of the DATE_ISO8601 constant. The trouble is caused by a missing colon in the second choice's output.