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I just checked in a new type of pick table that will be available in our next release. Just in case you are wondering, in Syntax a pick table is a simple database table of id, name pairs that are used mostly for categorizing other records. For example, you could have a picktable for topics, regions, and countries and use those across all your content types - people, documents, events, etc. Until now, these have been flat lists, and in truth they still are, but by adding a field called parent to a picktable, they can be displayed as a tree of options to users.

In the site administration application, child picks are drawn indented underneath their parent and sorted alphabetically. Also, you can not delete picks that have no parent ( parent=0 ) or that have children.

In an input form, if you use the pick_tree widget with a pick table with a parent column, they will be drawn as a hierarchical set of options for the user to select.