Where can I found the XML Schema of "<osm-script>" ?

[Binnette]

Hi, <osm-script> is the root element of each Overpass XML Query. I was wondering if it exists a schema that could describe all the tree of this element.

I hope to understand all possibles operations and improve the documentation on wiki OSM.

Note I spend dozen of hours (https://wiki.openstreetmap.org/wiki/User:Binnette/OverpassQueries) trying to make useful (and complex) queries, etc. I really hope to "unlock" new usages of my current Overpass QL knowledge.

Any help welcome 😊 And thank Overpass QL to being such a great tool 👍