What is JCSDL?
The transition from JCSDL into CSDL is not reversible, if you convert JCSDL into CSDL you lose the Query Builder state, but you keep the CSDL code. You can still edit it in the CSDL Editor.
Note that JCSDL is now up to version 2.0, but the editor is backwards compatible with 1.0.
For an introduction to CSDL consult our Language Guide.