Digital Object - PMA prototype documentation

Digital Object

Author: Denitsa Nenova, George Bruseker

Version: 1.0

The Digital Object reference data model provides a list of standard fields that are typically present in the general description of a Digital Object in a cultural heritage data system. A Digital Object is meant in the sense of a digitally encoded information object represented as bit sequences that have been encoded with a particular format and can be digitally decoded and represented to an end user of a digital information system. Digital Objects are often stored as reference or documentation objects relative to cultural heritage items such as textual descriptions stored as PDFs, documentary images, 3D representations and so on. Digital Objects can also form cultural heritage objects in their own right, though this model does not aim to represent this potential aspect of the Digital Object. Because of the choice to model, the Digital Object in its role as a secondary documentary resource, the reference data model has been kept as light as possible.

	Name	URI
Root Ontology Node	D1 Digital Object	https://cidoc-crm.org/Entity/D1-Digital Object/version-7.1.1
Type Differentiator	N/A	N/A

Model Sections Description

Information Category	Information Collections	Description
Names and Classifications	Names/Alternative Names/Identifiers/Type	The researcher can document various names and classification regarding the Digital Object.
Existence	Creation	The researcher can document the cretaion of the Digital Object.

Digital Object Names and Classifications

The attribution of identifiers, names and types to a Digital Object, as with other entities, is a basic human activity. It is crucial to document these aspects in order to be able to store and retrieve the correct Digital Object.

Filed ID	Name	Description	Data Type	CRM Path
LAF.10	Digital Object Identifier	This field is used to record an identifier attributed to the documented Digital Object.	String	->p1->E42[8_1]->p190->rdf:literal
LAF.9	Digital Object Identifier type	This field is used to record the type of the identifier attributed to the documented Digital Object.	Concept	->p1->E42[8_1]->p2->E55[9_1]
LAF.6	Digital Object Name	This field is used to record the string value of the name attributed to the documented Digital Object.	String	->p1->E33_E41[4_1]->p190->rdf:literal
LAF.5	Digital Object Name type	This field is used to record the type of the name attributed to the documented Digital Object.	Concept	->p1->E33_41[4_1]->p2->E55[5_1]
LAF.11	Digital Object Type	This field is used to record the formal type of the documented Digital Object.	Concept	->p2->E55[11_1]
LAF.114	Digital Object File Type	This field is used to record the formal file type of the documented Digital Object.	Concept	->p129->E73[112_1]->p2->E55[114_1]
LAF.115	Digital Object File Format	This field is used to record the file format of the documented Digital Object .	String	->p129->E73[112_1]->dc:format->rdf:literal

- Digital Object Names and Classifications Ontology Graph

Screenshot

- Digital Object Names and Classifications RDF

@prefix crm: <http://www.cidoc-crm.org/cidoc-crm/> .
@prefix dc: <http://dc> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

<https://pma.us/models/digital_resources/D1> a crm:D1_Digital_Object ;
    crm:P129_is_about <https://linked.art/example/conceptual_object/112_1> ;
    crm:P1_is_identified_by <https://linked.art/example/conceptual_object/4_1>,
        <https://linked.art/example/conceptual_object/8_1> ;
    crm:P2_has_type <https://linked.art/example/type/11_1> .

<http://vocab.getty.edu/page/aat/300404670> a crm:E55_Type ;
    rdfs:label "preferred terms" .

<https://linked.art/example/conceptual_object/112_1> a crm:E73_Information_Object ;
    dc:format "format_value" ;
    crm:P2_has_type <https://linked.art/example/type/114_1> .

<https://linked.art/example/conceptual_object/4_1> a crm:E33_E41_Linguistic_Appellation ;
    crm:P190_has_symbolic_content "Name_string_value" ;
    crm:P2_has_type <http://vocab.getty.edu/page/aat/300404670> .

<https://linked.art/example/conceptual_object/8_1> a crm:E42_Identifier ;
    crm:P190_has_symbolic_content "Identifier_value_content" ;
    crm:P2_has_type <https://linked.art/example/identifier/9_1> .

<https://linked.art/example/identifier/9_1> a crm:E55_Type .

<https://linked.art/example/type/114_1> a crm:E55_Type .

<https://linked.art/example/type/11_1> a crm:E55_Type .

- Digital Object Names and Classifications JSON-LD

{
  "@context": "https://linked.art/ns/v1/linked-art.json",
  "@graph": [
    {
      "classified_as": [
        "http://vocab.getty.edu/page/aat/300404670"
      ],
      "content": "Name_string_value",
      "id": "https://linked.art/example/conceptual_object/4_1",
      "type": "Name"
    },
    {
      "classified_as": [
        "https://linked.art/example/identifier/9_1"
      ],
      "content": "Identifier_value_content",
      "id": "https://linked.art/example/conceptual_object/8_1",
      "type": "Identifier"
    },
    {
      "_label": "preferred terms",
      "id": "http://vocab.getty.edu/page/aat/300404670",
      "type": "Type"
    },
    {
      "id": "https://linked.art/example/identifier/9_1",
      "type": "Type"
    },
    {
      "about": [
        "https://linked.art/example/conceptual_object/112_1"
      ],
      "classified_as": [
        "https://linked.art/example/type/11_1"
      ],
      "id": "https://pma.us/models/digital_resources/D1",
      "identified_by": [
        "https://linked.art/example/conceptual_object/8_1",
        "https://linked.art/example/conceptual_object/4_1"
      ],
      "type": "crm:D1_Digital_Object"
    },
    {
      "id": "https://linked.art/example/type/11_1",
      "type": "Type"
    },
    {
      "classified_as": [
        "https://linked.art/example/type/114_1"
      ],
      "http://dcformat": "format_value",
      "id": "https://linked.art/example/conceptual_object/112_1",
      "type": "InformationObject"
    },
    {
      "id": "https://linked.art/example/type/114_1",
      "type": "Type"
    }
  ]
}

Digital Object Existence

Of essential import in identifying and tracking a Digital Object are its creation and modification information. The model presented allows the tracking of the machine event which originally created the Digital Object as well as subsequent machine events of a modifying character of which it was the output. The destruction of the Digital Object is not modelled as being irrelevant to the use scope of integrated CH reference documentation.

Filed ID	Name	Description	Data Type	CRM Path
LAF.86	Digital Object Created by	This field is used to link the documented Digital Object creation activity to an actor responsible for carrying it out.	Reference Model [Person/Group]	->P94i->E65[71_1]->P14->E39[86_1]
LAF.89	Digital Object Created using	This field is used to link the documented Digital Object creation activity to an instance of physical object used in the exercise of this activity in a manner consequential to its outcome.	Reference Model [Object]	->P94i->E65[71_1]->P16->E22[89_1]
LAF.91	Digital Object Creation type	This field is used to record the formal type of the documented Digital Object creation activity.	Concept	->P94i->E65[71_1]->P2->E55[91_1]
LAF.90	Digital Object Creation time	This field is used to link the documented Digital Object creation activity to an instance of time-span recording the temporal extent of the activity.	Collection [Timespan]	->P94i->E65[71_1]->P4->E52[90_1]

- Digital Object Existence Ontology Graph

Screenshot

- Digital Object Existence RDF

@prefix crm: <http://www.cidoc-crm.org/cidoc-crm/> .

<https://pma.us/models/digital_resources/D1> a crm:D1_Digital_Object ;
    crm:P94i_was_created_by <https://linked.art/example/event/71_1> .

<https://linked.art/example/actor/86_1> a crm:E39_Actor .

<https://linked.art/example/event/71_1> a crm:E65_Creation ;
    crm:P14_carried_out_by <https://linked.art/example/actor/86_1> ;
    crm:P16_used_specific_object <https://linked.art/example/physical_object/89_1> ;
    crm:P2_has_type <https://linked.art/example/type/91_1> ;
    crm:P4_has_time-span <https://linked.art/example/time_span/90_1> .

<https://linked.art/example/physical_object/89_1> a crm:E22_Human-Made_Object .

<https://linked.art/example/time_span/90_1> a crm:E52_Time-Span .

<https://linked.art/example/type/91_1> a crm:E55_Type .

- Digital Object Existence JSON-LD

{
  "@context": "https://linked.art/ns/v1/linked-art.json",
  "@graph": [
    {
      "created_by": "https://linked.art/example/event/71_1",
      "id": "https://pma.us/models/digital_resources/D1",
      "type": "crm:D1_Digital_Object"
    },
    {
      "id": "https://linked.art/example/actor/86_1",
      "type": "Actor"
    },
    {
      "id": "https://linked.art/example/time_span/90_1",
      "type": "TimeSpan"
    },
    {
      "carried_out_by": [
        "https://linked.art/example/actor/86_1"
      ],
      "classified_as": [
        "https://linked.art/example/type/91_1"
      ],
      "id": "https://linked.art/example/event/71_1",
      "timespan": "https://linked.art/example/time_span/90_1",
      "type": "Creation",
      "used_specific_object": [
        "https://linked.art/example/physical_object/89_1"
      ]
    },
    {
      "id": "https://linked.art/example/physical_object/89_1",
      "type": "HumanMadeObject"
    },
    {
      "id": "https://linked.art/example/type/91_1",
      "type": "Type"
    }
  ]
}