Doctrine Inheritance: find all children of a table

I have a question about Table Inheritance in Doctrine. for an example I\'ll use 3 tables: Notification:

Different inheritance types in the same schema

I\'m using Doctrine 1.2 on a symfony project, and I\'m considering mixing concrete and column aggregation inheritance types in my schema:

How do I find a list of subclasses for a propel model with concrete inheritance

I\'m building a mini-cms for my local charity (yes, I know I could use a floss project, but they want custom coded)

可以在视频里面加歌的软件叫什么名字？