src/Camunda/Query/Attribute/Variables.php
public function addVariable(Variable $variable)
    {
        $this->variables[] = $variable;
        $this->_variables = true;

        return $this;
    }
public function addVariable(Variable $variable)
    {
        $this->variables[] = $variable;
        $this->_variables = true;

        return $this;
    }
Add variable

@param \Ds\Component\Camunda\Model\Variable $variable
@return object