gr:availabilityStarts leaf node

@prefix gr: <http://purl.org/goodrelations/v1#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

gr:availabilityStarts a owl:DatatypeProperty ;
    rdfs:label "availability starts (0..1)"@en ;
    rdfs:comment """This property specifies the beginning of the availability of the gr:ProductOrService included in the gr:Offering.
The difference to the properties gr:validFrom and gr:validThrough is that those specify the period of time during which the offer is valid and can be accepted.

Example: I offer to lease my boat for the period of August 1 - August 31, 2010, but you must accept by offer no later than July 15.

A time-zone should be specified. For a time in GMT/UTC, simply add a "Z" following the time:

2008-05-30T09:30:10Z.

Alternatively, you can specify an offset from the UTC time by adding a positive or negative time following the time:

2008-05-30T09:30:10-09:00

or

2008-05-30T09:30:10+09:00.

Note: There is another property gr:availableAtOrFrom, which is used to indicate the gr:Location (e.g. store or shop) from which the goods would be available."""@en ;
    rdfs:domain [ a owl:Class ;
            owl:unionOf ( gr:Offering <http://schema.org/Offer> ) ] ;
    rdfs:isDefinedBy <http://purl.org/goodrelations/v1> ;
    rdfs:range xsd:dateTime .