<refState>

<refState> (reference state) specifies one component of a canonical reference defined by the milestone method. 2.3.5.3 Milestone Method 2.3.5 The Reference System Declaration
Moduleheader — 2 The TEI Header
Attributes att.sourced (@ed)
unitindicates what kind of state is changing at this milestone.
Status Required
Datatype 

<rng:ref name="data.enumerated"/>
data.enumerated
Suggested values include:
page
page breaks in the reference edition.
column
column breaks.
line
line breaks.
book
any units termed book, liber, etc.
poem
individual poems in a collection.
canto
cantos or other major sections of a poem.
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.
lengthspecifies the fixed length of the reference component.
Status Optional
Datatype 

<rng:ref name="data.count"/>
data.count
Values Should be a positive integer; if no value is provided, the length is unlimited and goes to the next delimiter or to the end of the value.
Note
When constructing a reference, if the reference component found is of numeric type, the length is made up by inserting leading zeros; if it is not, by inserting trailing blanks. In either case, reference components are truncated if necessary at the right hand side.
When seeking a reference, the length indicates the number of characters which should be compared. Values longer than this will be regarded as matching, if they start correctly.
delim(delimiter) supplies a delimiting string following the reference component.
Status Optional
Datatype 

<rng:text/>
text
Values If a single space is used it is interpreted as whitespace.
Used by
refsDecl
May containEmpty element
Declaration

<rng:element name="refState">
<rng:ref name="att.global.attributes"/>
<rng:ref name="att.sourced.attributes"/>
<rng:attribute name="unit">
 <rng:choice>
  <rng:value>page</rng:value>
  <rng:value>column</rng:value>
  <rng:value>line</rng:value>
  <rng:value>book</rng:value>
  <rng:value>poem</rng:value>
  <rng:value>canto</rng:value>
  <rng:value>stanza</rng:value>
  <rng:value>act</rng:value>
  <rng:value>scene</rng:value>
  <rng:value>section</rng:value>
  <rng:value>absent</rng:value>
  <rng:data type="Name"/>
 </rng:choice>
</rng:attribute>
<rng:optional>
 <rng:attribute name="length">
  <rng:ref name="data.count"/>
 </rng:attribute>
</rng:optional>
<rng:optional>
 <rng:attribute name="delim">
  <rng:text/>
 </rng:attribute>
</rng:optional>
<rng:empty/>
</rng:element>
element refState
{
   att.global.attributes,
   att.sourced.attributes,
   attribute unit
   {
      "page"
    | "column"
    | "line"
    | "book"
    | "poem"
    | "canto"
    | "stanza"
    | "act"
    | "scene"
    | "section"
    | "absent"
    | xsd:Name
   },
   attribute length { data.count }?,
   attribute delim { text }?,
   empty
}
Example
<refState unit="book" delim=":"/>
<refState unit="line" length="4"/>