code: private void parseStepName() {
  	String prefix;
  	int colonIndex = name.indexOf(":");
  
  	if (colonIndex == -1) {
  	    // no colon, so localpart is simply name (even if it's "*")
  	    prefix = null;
  	    localPart = name;
  	} else {
  	    prefix = name.substring(0, colonIndex);
  	    localPart = name.substring(colonIndex + 1);
  	}
  
  	uri = mapPrefix(prefix);
      }
docs: Lazily computes some information about our name.