att.milestoneUnit

att.milestoneUnit provides an attribute to indicate the type of section which is changing at a specific milestone. [3.10.3 Milestone Elements 2.3.6.3 Milestone Method 2.3.6 The Reference System Declaration]
Modulecore — 3 Elements Available in All TEI Documents
MembersrefState milestone
AttributesAttributes
unitprovides a conventional name for the kind of section changing at this milestone.
Status Required
Datatype 

<rng:ref name="data.enumerated"/>
data.enumerated
Suggested values include:
page
physical page breaks (synonymous with the pb element).
column
column breaks.
line
line breaks (synonymous with the lb element).
book
any units termed book, liber, etc.
poem
individual poems in a collection.
canto
cantos or other major sections of a poem.
speaker
changes of speaker or narrator.
stanza
stanzas within a poem, book, or canto.
act
acts within a play.
scene
scenes within a play or act.
section
sections of any kind.
absent
passages not present in the reference edition.
unnumbered
passages present in the text, but not to be included as part of the reference.
<milestone n="23" ed="La" unit="Dreissiger"/>
... <milestone n="24" ed="AV" unit="verse"/> ...
Note

If the milestone marks the beginning of a piece of text not present in the reference edition, the special value absent may be used as the value of unit. The normal interpretation is that the reference edition does not contain the text which follows, until the next milestone tag for the edition in question is encountered.

In addition to the values suggested, other terms may be appropriate (e.g. Stephanus for the Stephanus numbers in Plato).