UMLR — Profile URI Attribute - Mingled URI Definition and Use in XMI

While describing profile URI attribute for profiles UML specification mingled definition of URI and format used for XMI. URI value as a whole should follow URI specification RFC 2396 and OMG recommended format:
uri = http://profileParentQualifiedName/version/profileName.xmi
When URI is used for XMI, the profileParentQualifiedName part should also be (made?) valid XML QName, e.g. with "all other illegal XML QName characters removed". Note, that XML QName usually has namespace prefix followed by ':', e.g. 'taxes:dependent', which contradicts to and has no sense as related to the first URI 2396 requirement.