Add P81a, P81b, P82a and P82b data properties

[koslambrou]

The RDFS 6.2.1 version of CIDOC CRM contains the properties P81a, P81b, P82a and P82b which allow to assign datetimes to the P81 and P82 properties.

They should be added to ECRM.

Here is a copy/paste definition of those properties:

<rdf:Property rdf:about="P81a_end_of_the_begin">
  <rdfs:label xml:lang="en">end of the begin</rdfs:label>
  <rdfs:label xml:lang="el">τέλος της αρχής</rdfs:label>
  <rdfs:label xml:lang="de">Ende des Anfangs</rdfs:label>
  <rdfs:label xml:lang="fr">fin du début</rdfs:label>
  <rdfs:label xml:lang="ru">конец начала</rdfs:label>
  <rdfs:label xml:lang="pt">fim do início</rdfs:label>
  <rdfs:comment>
    This is defined as the first boundary of the property P81
  </rdfs:comment>
  <rdfs:domain rdf:resource="E52_Time-Span"/>
  <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#dateTime"/>
  <rdfs:subPropertyOf rdf:resource="P81_ongoing_throughout"/>
</rdf:Property>
<rdf:Property rdf:about="P81b_begin_of_the_end">
  <rdfs:label xml:lang="en">begin of the end</rdfs:label>
  <rdfs:label xml:lang="fr">début de la fin</rdfs:label>
  <rdfs:label xml:lang="el">αρχή του τέλους</rdfs:label>
  <rdfs:label xml:lang="de">Anfang vom Ende</rdfs:label>
  <rdfs:label xml:lang="ru">начать в конце</rdfs:label>
  <rdfs:label xml:lang="pt">começar do fim</rdfs:label>
  <rdfs:comment>
    This is defined as the second boundary of the property P81
  </rdfs:comment>
  <rdfs:domain rdf:resource="E52_Time-Span"/>
  <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#dateTime"/>
  <rdfs:subPropertyOf rdf:resource="P81_ongoing_throughout"/>
</rdf:Property>
<rdf:Property rdf:about="P82a_begin_of_the_begin">
  <rdfs:label xml:lang="en">begin of the begin</rdfs:label>
  <rdfs:label xml:lang="fr">début du début</rdfs:label>
  <rdfs:label xml:lang="el">αρχή της αρχής</rdfs:label>
  <rdfs:label xml:lang="de">Anfang des Anfangs</rdfs:label>
  <rdfs:label xml:lang="ru">начать с начала</rdfs:label>
  <rdfs:label xml:lang="pt">começar do início</rdfs:label>
  <rdfs:comment>
    This is defined as the first boundary of the property P82
  </rdfs:comment>
  <rdfs:domain rdf:resource="E52_Time-Span"/>
  <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#dateTime"/>
  <rdfs:subPropertyOf rdf:resource="P82_at_some_time_within"/>
</rdf:Property>
<rdf:Property rdf:about="P82b_end_of_the_end">
<rdfs:label xml:lang="en">end of the end</rdfs:label>
<rdfs:label xml:lang="fr">fin de la fin</rdfs:label>
<rdfs:label xml:lang="el">τέλος του τέλους</rdfs:label>
<rdfs:label xml:lang="de">Ende vom Ende</rdfs:label>
<rdfs:label xml:lang="ru">конец конец</rdfs:label>
<rdfs:label xml:lang="pt">fim do fim</rdfs:label>
<rdfs:comment>
This is defined as the second boundary of the property P82
</rdfs:comment>
<rdfs:domain rdf:resource="E52_Time-Span"/>
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#dateTime"/>
<rdfs:subPropertyOf rdf:resource="P82_at_some_time_within"/>
</rdf:Property>

Here is the corresponding file: http://www.cidoc-crm.org/sites/default/files/cidoc_crm_v6.2.1-2018April.rdfs

[VincentDucatteeuw]

I would like to support this request.

Some humanities projects are already referencing the Erlangen CRM when using these properties, even though they are not implemented in the Erlangen CRM.

In a CIDOC CRM technical paper Implementing the CIDOC Conceptual Reference Model in RDF (2020) Doerr and Light further specify the guidelines for P81a, P81b, P82a and P82b:

The range of the properties "P81 ongoing throughout" and "P82 at some time within" are
defined in the CRM as E61 Time Primitive. Instances of E61 Time Primitive are defined as
closed, contiguous intervals on the natural time dimension in which we live. “Closed” means
that the endpoints belong to the interval. “Contiguous” means that there are no gaps between
the endpoints in the interval (which holds for “intervals” in general).
The reason to describe time spans with inner and outer intervals is the existence of a very
efficient algebra for calculating resulting areas of determinacy and indeterminacy (Cowley &
Plexousakis 2000). Further, they are motivated by the British MIDAS Heritage standards
[https://en.wikipedia.org/wiki/MIDAS_Heritage] and easy to define in Relational databases.
Since the E61 Time Primitive of the CRM cannot be expressed in RDF directly, in the official
RDF implementation of the CIDOC CRM, we define four properties replacing P81 and P82
adequately using xsd:dateTime.

[VladimirAlexiev]

The Russian labels are screwed, except for P81a. I reported that to the CRM SIG 5y ago.

[Knurg]

You're welcome to provide a domain ontology adding these. :)