public function getFirstExpression()
    {
        $returnValue = null;

        
        if(empty($this->firstExpression)){
        	$property = new core_kernel_classes_Property(RulesRdf::PROPERTY_FIRST_EXPRESSION);
			$this->firstExpression = new core_kernel_rules_Expression($this->getUniquePropertyValue($property)->getUri());
        }
		$returnValue = $this->firstExpression;
        

        return $returnValue;
    }
public function getFirstExpression()
    {
        $returnValue = null;

        
        if(empty($this->firstExpression)){
        	$property = new core_kernel_classes_Property(RulesRdf::PROPERTY_FIRST_EXPRESSION);
			$this->firstExpression = new core_kernel_rules_Expression($this->getUniquePropertyValue($property)->getUri());
        }
		$returnValue = $this->firstExpression;
        

        return $returnValue;
    }
public function getFirstExpression ( ) { $ returnValue = null ; if ( empty ( $ this -> firstExpression ) ) { $ property = new core_kernel_classes_Property ( RulesRdf :: PROPERTY_FIRST_EXPRESSION ) ; $ this -> firstExpression = new core_kernel_rules_Expression ( $ this -> getUniquePropertyValue ( $ property ) -> getUri ( ) ) ; } $ returnValue = $ this -> firstExpression ; return $ returnValue ; }
Short description of method getFirstExpression

@access public
@author firstname and lastname of author, <author@example.org>
@return core_kernel_rules_Expression
Short description of method getFirstExpression