Temporal constraint box to capture a consistent set of validity and efficacy intervals. Objects of this class also serve the purpose to capture additional constraints or annotations, in particular when they are also temporally constrained. Example ------- ccy:EUR a ccy:ISO4217-CurrencyCode ; ccy:usedIn cc:DE , cc:GR ; rdfs:label "EUR" ; tempo:constrainedBy [ a tempo:TemporalConstraint ; tempo:validFrom "1999-01-01"^^xsd:date ; ccy:usedIn cc:DE ; ] , [ a tempo:TemporalConstraint ; tempo:validFrom "2001-01-01"^^xsd:date ; ccy:usedIn cc:GR ; ] . meaning the currency code 'EUR' became valid in Germany in 1999 whereas in Greece it became valid in 2001.