https://qt4cg.org/specifications/xquery-40/xquery-40.html#id-deep-lookup educates about deep lookup operator for maps and arrays. Although BaseX and Saxon XQJ processors implement this Xquery 4.0 (even though it is in draft status), this deep lookup operator for maps and arrays is not implemented there. Does anyone know which XQJ processor (if any) implements this deep lookup operation for maps and arrays ?
Tried using deep lookup for maps and arrays in BaseX and Saxon, but it doesn't seem to be supported.
We have implemented this but not yet released it. We're holding back new QT4.0 features at the moment until SaxonJ 13 comes out. The spec on this is still in flux.