`<state>` | specifies one component of a canonical reference defined by the ``milestone'' method.

Attributes:

`ed` | (edition) indicates which edition or version the milestone applies to.
| Datatype: CDATA
| Values: Any string of characters; usually a siglum conventionally used for the edition.
| Default: #IMPLIED
Note | If `ed` is not specified, then any milestone tag with an appropriate `unit` attribute will be selected.

`unit` | indicates what kind of section is changing at this milestone.
| Datatype: CDATA

Legal values:

`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.

| Default: #REQUIRED
Note |
`length` | specifies the fixed length of the reference component.
| Datatype: NUMBER
| 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.
| Default: #IMPLIED

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` | supplies a delimiting string following the reference component.
| Datatype: CDATA
| Values: If a single space is used it is interpreted as whitespace.
| Default: #IMPLIED
Note |

Example

      <state unit=book delim=":">
      <state unit=line length=4>

Note
Tagset auxiliary tag set for TEI headers
Class
Filename `teihdr2`
Content:
Parents refsDecl
Children[none] [May not include at any level: stage]
Declaration

    <!ELEMENT state         - O  EMPTY                              >
    <!ATTLIST state              %a.global
              ed                 CDATA               #IMPLIED
              unit               CDATA               #REQUIRED
              length             NUMBER              #IMPLIED
              delim              CDATA               #IMPLIED       >

See 5.3.5.3 ; 5.3.5

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