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VIVO uses DateTimeValue and DateTimeInterval to model dates and datetimes.  These are objects, not literal values.  The object models are simple (see below).  VIVO DateTimeValue supports the concept of a precision, which indicates whether a particular DateTimeValue is accurate to the day, or perhaps only to the month, or perhaps only to the year.  Precision is an important idea – publication dates, for example, are often known only to year precision, and sometimes to year and month.

The model indicates that creating a DateTimeValue requires three triples – one to specify the type, one to specify the literal value of the datetime, and one to indicate the precision.

<http://vivo.myschool.edu> rdf:type vivo:DateTimeValue .
<http://vivo.myschool.edu> vivo:dateTime "2010-11-12T12:00:00"^^xsd:datetime .
<http://vivo.myschool.edu> vivo:dateTimePrecision vivo:yearPrecision .

VIVO provides the precisions shown below:

  • <http://vivoweb.org/ontology/core#yearMonthDayTimePrecision>
  • <http://vivoweb.org/ontology/core#yearMonthPrecision>
  • <http://vivoweb.org/ontology/core#yearPrecision>
  • <http://vivoweb.org/ontology/core#yearMonthDayPrecision>

 

Ontology Diagram Legend
Dark blue – the entity being modeled

Light blue – entities dependent on the entity being modeled. These will typically be created along with the entity being modeled, and should be removed if the entity being modeled is removed.

Green  – independent entities. These typically pre-exist in your VIVO when adding the entity being modeled. These should not be removed if the entity being modeled is removed.

 

Ontology Diagram Legend
Dark blue – the entity being modeled

Light blue – entities dependent on the entity being modeled. These will typically be created along with the entity being modeled, and should be removed if the entity being modeled is removed.

Green  – independent entities. These typically pre-exist in your VIVO when adding the entity being modeled. These should not be removed if the entity being modeled is removed.

 

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