public function addExpressionCondition($expression) {
        if(!isset($this->_subscription->subject)){
            $this->_subscription->subject = (object) [];
        }

        if(!isset($this->_subscription->subject->condition)){
            $this->_subscription->subject->condition = (object) [];
        }


        $this->_subscription->subject->condition->expression = $expression;
        return $this;
    }
public function addExpressionCondition($expression) {
        if(!isset($this->_subscription->subject)){
            $this->_subscription->subject = (object) [];
        }

        if(!isset($this->_subscription->subject->condition)){
            $this->_subscription->subject->condition = (object) [];
        }


        $this->_subscription->subject->condition->expression = $expression;
        return $this;
    }
public function addExpressionCondition ( $ expression ) { if ( ! isset ( $ this -> _subscription -> subject ) ) { $ this -> _subscription -> subject = ( object ) [ ] ; } if ( ! isset ( $ this -> _subscription -> subject -> condition ) ) { $ this -> _subscription -> subject -> condition = ( object ) [ ] ; } $ this -> _subscription -> subject -> condition -> expression = $ expression ; return $ this ; }
Add expression condition
" an expression composed of `q`,`georel`,`geometry`  and `coords`

http://telefonicaid.github.io/fiware-orion/api/v2/stable/
@param string $expression
@return \Orion\Context\Subscription
Add expression condition an expression composed of q georel geometry and coords