Parse a YAML specification of a target execution context into this
        object.

def parse_yaml(self, y):
        '''Parse a YAML specification of a target execution context into this
        object.

        '''
        super(TargetExecutionContext, self).parse_yaml(y)
        if 'id' in y:
            self.id = y['id']
        else:
            self.id = ''
        return self