Can I define a xacro with params by another xacro?

Hi I am trying to define a xacro macro with another macro. But I am getting an error about one of the internal params from the macro. Is there an escape sequence or something for that? Currently I get the error: > raise XacroException("Property wasn't defined: %s" % str(ex))> xacro.XacroException: Property wasn't defined: u'name' Thanks!