Further file formats

[l-emele]

Here is a list of classes that are not yet implemented:

• GAMS data exchange format: A GAMS data exchange format is a binary file format used by General Algebraic Modeling System (GAMS).
• microsoft excel workbook (xls)
• microsoft excel workbook (xlsx)
• data file encoding
• in-memory data format
• data base format
• structured file format with subclasses xml and json
• file encoding: A file encoding is a data format, that specifies the characterset used to encode the data in a file.
• data file encoding
• in-memory data format with subclass data frame
• data base format

Originally posted by @l-emele in https://github.com/OpenEnergyPlatform/ontology/issues/1145#issuecomment-1290277942

[l-emele]

SWO (see also #1502) has a lot of file formats already covered: