Center attribute missing on OSM entities

[labiang]

The "center" attribute that sometime is received from an Overpass response is missing in the implementation of the osm4j parsers (especially XML parser).

The center attribute belongs to ways/relations and looks something like this: <center lat="46.2965728" lon="8.7908617"/>

Example of a whole tag (including center attribute): <way id="458341945" version="2" timestamp="2021-04-26T18:48:09Z" changeset="103656292" uid="74900" user="FischersFritz"> <center lat="46.2965728" lon="8.7908617"/> <nd ref="4543689513"/> <nd ref="8669512158"/> <nd ref="8669512156"/> <nd ref="8669512155"/> <nd ref="8669512157"/> <nd ref="4543689514"/> <nd ref="8669512151"/> <nd ref="8669512149"/> <nd ref="8669512148"/> <nd ref="8669512150"/> <nd ref="4543689515"/> <nd ref="8669512146"/> <nd ref="8669512145"/> <nd ref="8669512144"/> <nd ref="8669512147"/> <nd ref="4543689516"/> <nd ref="8669512154"/> <nd ref="8669512153"/> <nd ref="8669512152"/> <nd ref="8669512159"/> <nd ref="4543689513"/> <tag k="building" v="yes"/> <tag k="castle_type" v="palace"/> <tag k="historic" v="castle"/> <tag k="name" v="Castello Marcacci"/> </way>