class.exQuestionPoolExporter.php

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<?php

class exQuestionPoolExporter extends ilXmlExporter
{
    public function getValidSchemaVersions(string $a_entity): array
    {
        /* export schema versions code */
        return [];
    }

    public function init(): void
    {
        /* question pool init code */
    }

    public function getXmlRepresentation(string $a_entity, string $a_schema_version, string $a_id): string
    {
        /* question pool export code */

        return '';
    }

    public function getXmlExportTailDependencies(string $a_entity, string $a_target_release, array $a_ids): array
    {
        if ($a_entity == 'qpl') {
            $deps = array();

            $questionIds = array(); // initialise with question ids that need to be exported

            if (count($questionIds)) {
                $deps[] = array(
                    'component' => 'components/ILIAS/AssessmentQuestion',
                    'entity' => 'qst',
                    'ids' => $questionIds
                );
            }

            return $deps;
        }

        return parent::getXmlExportTailDependencies($a_entity, $a_target_release, $a_ids);
    }
}