we have a top level category called torah media.

right now this is the space to create sets, being the primary set itself.

each set contains one or more elements

each element holds two references. one to the set and one to its parent element.

each element which doesnt have any references to it as a parent is called a leaf.

	each element can have certain media attachments such as:
	- rich text
	- a downloadable pdf
	- a video/audio series
