I have something similar that I use for stating the year the species was described.

This is useful for sorting by year etc.  So +1

Note the datatype rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear"

 
        From http://lod.taxonconcept.org/ses/v6n7p.html RDF http://10.10.10.122:3000/ses/v6n7p.rdf
    <txn:yearDescribed rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">1771</txn:yearDescribed>


Ontology 

    <!-- http://lod.taxonconcept.org/ontology/txn.owl#yearDescribed -->

    <owl:DatatypeProperty rdf:about="http://lod.taxonconcept.org/ontology/txn.owl#yearDescribed">
        <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">yearDescribed</rdfs:label>
        <rdfs:comment>The year that the species was originally described</rdfs:comment>
        <rdfs:isDefinedBy rdf:resource="http://lod.taxonconcept.org/ontology/txn.owl"/>
        <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#gYear"/>
    </owl:DatatypeProperty>

- Pete

On Mon, Jul 4, 2011 at 5:35 PM, John Wieczorek <tuco@berkeley.edu> wrote:
Darwin Core Issue 84: http://goo.gl/8WkJa

This issue has not undergone public commentary.

Open Issues:
Determine if there is a demand for this term. Though the term is
well-described in the issue tracker, there is no evidence of a
real-world need for it. There has to be a demonstrated need from more
than one "independent" source for a term to enter into consideration
for addition to the Darwin Core.
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Pete DeVries
Department of Entomology
University of Wisconsin - Madison
445 Russell Laboratories
1630 Linden Drive
Madison, WI 53706
Email: pdevries@wisc.edu
TaxonConcept  &  GeoSpecies Knowledge Bases
A Semantic Web, Linked Open Data  Project
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