The structure.py seems not to be compatible with previous OEM versions

[openenergyplatform]

The structure.py seems not to be compatible with previous OEM versions

[MGlauer]

I agree, that there are two ways forward here:

1. Keep the internal representation (structure.py) and create a second that reflects the newer version and implement translations between those representations.
2. Update structure.py, but update parsers and compilers to translate older versions into the newer structure.

I think I would prefer the first one, given our use-cases. The intention of OMI is that users can use the present python structures in their code to define metadata objects. If these structures change, it may break the code of these users. But I do not have any definite opinions on this.

[jh-RLI]

@MGlauer
I have started to implement this towards the approach described in 1. In the process more questions came up:
(have not yet pushed anything)

• If I see this correctly, after splitting the structure [1] into one module per oemetadata version, it is also necessary to create an explicit class for all compilers. So for example under src/omi/dialects/oep/compyler.py you have to create one class for the JSONCompiler [2] per oemetadata version. The same goes for the parser, also here you have to create one parser class per oemetada version. (Or is there a better approach to implement this?).
• Which structure should be used in the base dialect then?

[1]

[2]
old

class JSONCompiler(Compiler):
    __METADATA_VERSION = "OEP-1.4.0"
.....

new

class JSONCompilerOEMv1_4_0(Compiler):
    __METADATA_VERSION = "OEP-1.4.0"
    ....

class JSONCompilerOEMv1_4_1(Compiler):
    __METADATA_VERSION = "OEP-1.4.1"
    .....

class JSONCompilerOEMv1_5_0(Compiler):
    __METADATA_VERSION = "OEP-1.5.0"
    .....

class JSONCompilerOEMv1_5_1(Compiler):
    __METADATA_VERSION = "OEP-1.5.1"
   .....