<geoDecl>

<geoDecl> (geographic coordinates declaration) documents the notation and the datum used for geographic coordinates expressed as content of the geo element elsewhere within the document.
Module header — 2 The TEI Header
In addition to global attributes att.declarable (@default)
datum supplies a commonly used code name for the datum employed.
Status Mandatory when applicable
Datatype 

<rng:ref name="data.enumerated"/>
data.enumerated
Suggested values include:
WGS84
(World Geodetic System) a pair of numbers to be interpreted as latitude followed by longitude according to the World Geodetic System. [Default]
MGRS
(Military Grid Reference System) the values supplied are geospatial entity object codes, based on
OSGB36
(ordnance survey great britain) the value supplied is to be interpreted as a British National Grid Reference.
ED50
(European Datum coordinate system) the value supplied is to be interpreted as latitude followed by longitude according to the European Datum coordinate system.
Used by
model.encodingDescPart
May contain
analysis: c cl interp interpGrp m pc phr s span spanGrp w
certainty: certainty precision respons
core: abbr add address binaryObject cb choice corr date del distinct email emph expan foreign gap gloss graphic hi index lb measure measureGrp mentioned milestone name note num orig pb ptr ref reg rs sic soCalled term time title unclear
dictionaries: lang oRef oVar pRef pVar
figures: figure formula
gaiji: g
header: idno
iso-fs: fLib fs fvLib
linking: alt altGrp anchor join joinGrp link linkGrp seg timeline
msdescription: catchwords depth dim dimensions height heraldry locus locusGrp material origDate origPlace secFol signatures stamp watermark width
namesdates: addName affiliation bloc country district forename genName geo geogFeat geogName nameLink offset orgName persName placeName region roleName settlement state surname
spoken: incident kinesic pause shift vocal writing
tagdocs: att code gi ident specDesc specList tag val
textcrit: app witDetail
transcr: addSpan am damage damageSpan delSpan ex fw handShift restore space subst supplied surplus
verse: caesura rhyme
Declaration 

<rng:element name="geoDecl">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.declarable.attributes"/>
 <rng:optional>
  <rng:attribute name="datum" a:defaultValue="WGS84">
   <rng:choice>
    <rng:value>WGS84</rng:value>
    <rng:value>MGRS</rng:value>
    <rng:value>OSGB36</rng:value>
    <rng:value>ED50</rng:value>
    <rng:data type="Name"/>
   </rng:choice>
  </rng:attribute>
 </rng:optional>
 <rng:ref name="macro.phraseSeq"/>
</rng:element>
element geoDecl
{
   att.global.attributes,
   att.declarable.attributes,
   attribute datum { "WGS84" | "MGRS" | "OSGB36" | "ED50" | xsd:Name }?,
   macro.phraseSeq
}
Example
<geoDecl datum="OSGB36"/>