The MGen IDL is the language we created for specifying data models in. It’s written in XML, and supports:

• Classes with single inheritance
• Fixed point numeric types: int8, int16, int32, int64
• Floating point numeric types: float32, float64
• Strings
• maps: [numeric/string -> any]
• lists: [any]
• arrays: [any]
• enumerations
• Class members of any type of the types above (and classes)
• Class members that are polymorphic
• Class member default values
• Class member flags (e.g. required, polymorphic, transient etc.)
• Class constants
• Heterogenous containers (through polymorphism)

For more information of what features are supported in the MGen IDL, see our preliminary technical whitepaper.

Also have a look at some of the test models for MGen we have over at github:

• https://github.com/culvertsoft/mgen/tree/master/mgen-compiler/src/test/resources
• https://github.com/culvertsoft/mgen/tree/master/mgen-integrationtests/models/depends
• https://github.com/culvertsoft/mgen/tree/master/mgen-integrationtests/models/read
• https://github.com/culvertsoft/mgen/tree/master/mgen-integrationtests/models/write