Types of work (OFSO)

For OFSO, every e element must have a role attribute to indicate the type of work.

The values of the role attribute are summarized in the table below.

Work	role value
Letter	`letter`
Poem	`poem`
Diary entry	`diary-entry`
Sermon	`sermon`
Lecture	`lecture`
Essay	`essay`
Stage play	`stage-play`
Journal	`journal`
Dialogue	`dialogue`
Collection of sub-works (see below)	`collection`
Other (unspecified)	`work`