In chapter 19 of the reference guide some coding examples seem to be inaccurate or incorrect. Especially when it comes to the bidirectional many-to-many associations, this might be confusing.

Example:
The code fragment on http://www.doctrine-project.org/docs/orm/2.0/en/reference/annotations-reference.html#annref-manytomany has the following issues:

• it does not include class declarations although the collections associated are both mentioned. It should be clear to which target entity they belong and therefore their classes should be declared.

• from the context it seems that the associated classes should probably be User and Group, and the owning side is User. So the association should probably be inversed by 'users', although the example mentions 'features'.

• the mapping for the inverse side maps a collection called $features, although this should probably be $users. Also the class declaration for the Group class is missing.

Some other code fragments in chapter 19 have similar issues. I think they could easily be replaced by the examples from the earlier chapters, like for the bidirectional man-to-many association the example from chapter 5:

http://www.doctrine-project.org/docs/orm/2.0/en/reference/association-mapping.html#many-to-many-bidirectional