addElementNonEmpty('bitcoin', app.Bitcoin, doc, apel)
addElementNonEmpty('litecoin', app.Litecoin, doc, apel)
addElementNonEmpty('flattr', app.FlattrID, doc, apel)
+ addElementNonEmpty('liberapay', app.LiberapayID, doc, apel)
# These elements actually refer to the current version (i.e. which
# one is recommended. They are historically mis-named, and need