bergie/phpcr-odm — comment on commit ae5c19f50349b35d20a3447345d0c820572f0d64
File: lib/Doctrine/ODM/PHPCR/Document/File.php line 183
By bergie:

From [Jackrabbit](http://jackrabbit.apache.org/node-types.html):

> *Mandatory Status* A mandatory property is one that must exist. If a node of a type that specifies a mandatory property is created then any attempt to save that node without adding the mandatory property will fail.