code: private Ref functionArgDeclarationVarString() throws PageException {
  
  	cfml.removeSpace();
  	StringBuilder str = new StringBuilder();
  	String id = null;
  	while ((id = identifier(false)) != null) {
  	    if (str.length() > 0) str.append('.');
  	    str.append(id);
  	    cfml.removeSpace();
  	    if (!cfml.forwardIfCurrent('.')) break;
  	    cfml.removeSpace();
  	}
  	cfml.removeSpace();
  	if (str.length() > 0 && cfml.charAt(cfml.getPos() - 1) != '.') return new LString(str.toString());
  
  	throw new InterpreterException("invalid variable name definition");
      }
docs: Liest einen gelableten Funktionsparamter ein <br />
  EBNF:<br />
  <code>assignOp [":" spaces assignOp];</code>
  
  @return CFXD Element
  @throws PageException