$ symfony propel-build-schema
We thought that, for a framework trying to be as simple as possible, it was not the best we could do. As a matter of fact, quite a number of symfony beginners were afraid about its configuration specifically because of this XML file. Some of them were even caught quitting at that point, when they thought that learning a new syntax for schema files was too much for a first try.
So we made it possible to write database schemas in YAML format. You know how we like this format: It's easy to read and write, it's simple to understand, and it's fun.
Nothing more. Save this into a schema.yml file in your project config/ folder, then run
$ symfony propel-build-model
...and the Propel model classes are generated just as before.