Algo-Web / POData

        if ($entry->isMediaLinkEntry) {

            $this->xmlWriter->startElement(ODataConstants::ATOM_LINK_ELEMENT_NAME);

            if ($entry->mediaLink->eTag != null) {

                $this->xmlWriter->startAttributeNs(

                    ODataConstants::ODATA_METADATA_NAMESPACE_PREFIX,

                    ODataConstants::ATOM_ETAG_ATTRIBUTE_NAME,

                    null

                );

                $this->xmlWriter->text($entry->mediaLink->eTag);

                $this->xmlWriter->endAttribute();

            }

            $this->xmlWriter->startAttribute(

                ODataConstants::ATOM_LINK_RELATION_ATTRIBUTE_NAME

            );

            foreach ($entry->mediaLinks as $mediaLink) {

                $this->xmlWriter->startElement(ODataConstants::ATOM_LINK_ELEMENT_NAME);

                if ($mediaLink->eTag != null) {

                    $this->xmlWriter->startAttributeNs(

                        ODataConstants::ODATA_METADATA_NAMESPACE_PREFIX,

                        ODataConstants::ATOM_ETAG_ATTRIBUTE_NAME,

                        null

                    );

                    $this->xmlWriter->text($mediaLink->eTag);

                    $this->xmlWriter->endAttribute();

                }

                $this->xmlWriter->startAttribute(ODataConstants::ATOM_LINK_RELATION_ATTRIBUTE_NAME);

                $this->xmlWriter->text($mediaLink->rel);

                $this->xmlWriter->endAttribute();