Register a namespace URI with a suggested prefix. It is not an error if the URI is already registered, no matter what the prefix is. If the URI is not registered but the suggested prefix is in use, a unique prefix is created from the suggested one. The actual registeed prefix is always returned. The function result tells if the registered prefix is the suggested one.
Note: No checking is presently done on either the URI or the prefix.
@param namespaceURI The URI for the namespace. Must be a valid XML URI.
@param suggestedPrefix The suggested prefix to be used if the URI is not yet registered. Must be a valid XML name.
@return Returns the registered prefix for this URI, is equal to thesuggestedPrefix if the namespace hasn't been registered before, otherwise the existing prefix.
@throws XMPException If the parameters are not accordingly set