4. Convert EMD to EML

Run the following command:

les convert

Event Markup Language is a YAML schema for describing event sourced systems which make use of the CQRS (“Command Query Responsibility Segregation”) pattern. EML makes such designs accessible to tools like les validate which act as a kind of “architect in a box”.

This makes it possible to automatically validate whether implementing the design is likely to result in a good event sourced system:

EML is implementation language agnostic. It doesn’t matter what stack the CQRS/ES system will be written in. At the moment there is a builder for EML -> NodeJS (les-node). There’s also EML -> Swagger spec to give developers a nice UI to play with the system’s API. A EML -> Golang implementation is in early alpha.

Try “les --help