Transform complex features into simple features GML with HALE

Question

Background information:

I'm working with complex GML features and would like to publish my data as a WFS service through GeoServer. I know there is already the application schema support (app-schema) extension which provides support for Complex Features in GeoServer WFS.
What I have to do now is to create a mapping file. I'm just trying to figure out what the best options are.

I found out that the HALE Alignment Editor (See here) is able to create a mapping file from simple features through the alignment between the source and the target schemas.

I think the program is very useful to create a mapping file on a visual basis using simple features as input. Nevertheless, I found no information if you can transform your data in the opposite way (Complex into Simple).

Question:

Is there a way to break down the complex features so that I can import them as simple features into the HALE Alignment Editor?

Something like this:
Complex Features -> "Transformation" -> Simple Features -> "HALE Alignment" -> Complex Features + App Schema -> Ready to use with GeoServer

Answer 1

As @nmtoken mentioned before, HALE can work with complex features. The thing is, that the plugin in hale studio that do an export to a GeoServer AppSchema mapping only supports a PostGIS source schema.

To make a long story short: for my approach it's not possible to use HALE, because my data is stored in a gml file. For more details see the Plugin documentation