Get a resource from a builder name.

        :param type schemacls: waited schema class.
        :param str name: builder name to use.
        :return: resource returned by the right builder.getresource(schema).

def getresource(self, schemacls, name):
        """Get a resource from a builder name.

        :param type schemacls: waited schema class.
        :param str name: builder name to use.
        :return: resource returned by the right builder.getresource(schema).
        """
        return self.builders[name].getresource(schemacls=schemacls)