I am implementing a tagging system for a website that uses JDO . I would like to use this method.

However I am new to relationships in JDO. To keep it simple, what I have looks like this:

@PersistentCapable
class Post {
@Persistent String title;
@Persistent String body;
}

@PersistentCapable
class Tag {
@Persistent String name;
}

What kind of JDO relationships do I need and how to implement them? I want to be able to list all Tags that belong to a Post, and also be able to list all Posts that have a given Tag. So in the end I would like to have something like this:

Table: Post
Columns: PostID, Title, Body

Table: Tag
Columns: TagID, name

Table: PostTag
Columns: PostID, TagID