sipub The datatype for a stream initiation profile XEP-0137: Publishing SI Requests x An ad-hoc datatype XEP-0122: Data Forms Validation xs A "standard" datatype as defined in XML Schema Part 2 XML Schema Part 2: Datatypes pubsub Includes the integer-or-max datatype defined in XEP-0060. XEP-0060: Publish-Subscribe