src/LightSaml/Model/Metadata/RoleDescriptor.php
public function addSignature(Signature $signature)
    {
        if (false == is_array($this->signatures)) {
            $this->signatures = array();
        }
        $this->signatures[] = $signature;

        return $this;
    }
public function addSignature(Signature $signature)
    {
        if (false == is_array($this->signatures)) {
            $this->signatures = array();
        }
        $this->signatures[] = $signature;

        return $this;
    }
@param \LightSaml\Model\XmlDSig\Signature $signature

@return RoleDescriptor