Fatal error: Class PKPNlm30MetadataPlugin contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (MetadataPlugin::supportsFormat, MetadataPlugin::getSchemaObject) in /public_html/plataformas/educativas/public/revistas/lib/pkp/plugins/metadata/nlm30/PKPNlm30MetadataPlugin.inc.php on line 22