As dataTypes (among other purposes) serve for checking user input of SpecIF model editors, a type for URIs resp. URLs would help.
For example, if a property has a dataType 'xs:dateTime' or 'xs:integer', a key-by-key input check may determine using a regex whether the user-input is valid. The same is possible, if there is a dataType as known in XML, see xs:anyURI.
As dataTypes (among other purposes) serve for checking user input of SpecIF model editors, a type for URIs resp. URLs would help. For example, if a property has a dataType 'xs:dateTime' or 'xs:integer', a key-by-key input check may determine using a regex whether the user-input is valid. The same is possible, if there is a dataType as known in XML, see xs:anyURI.