For the description of dates, we used the International Standard for the representation of dates and times ISO 8601 specified by the W3Consortium. We decided to include only the year, month and day and not to go further in details as this was enough for representing our items. The formats we used were: YYYY, YYYY-MM, YYYY-MM-DD (Y=year, M=month, D=day). To include this information in the XML file we used the EAC-CPF attribute for Date standardDate, which accepts the aforementioned formats. ISAAR (CPF) was used for giving information about date and people, such as for identifying people involved in an event occuring on the date. The EAD ontology was widely used for providing information about events occurring on the date. We decided to take into consideration the degree of certainty of the date, since given the historical period, the domain of interest and the kinds of resources, we cannot always count on an absolute certain date. For this purpose, we reused the EAD attribute “certainty”. We included the meaning of the date’s relation with a resource, agent and event. This information was provided through the use of the CDWA category “data qualifier”. These reusals allowed us to match our approach to dates with the general approach of our ontology “Plucky”, in the attempt to provide an interlinked and consistent framework.
| Question | Subject | Predicate | subclass | Predicate is based on | eac-cpf or CDWALITE equivalent |
|---|---|---|---|---|---|
| What type of entity? | plucky:entity | plucky:is_entity_type | ISAAR: [5.1.1 Type of entity] | EAC-CPF:entityType | |
| In which format is the date expressed? | plucky:entity | plucky:data_format | EAC-CPF: date standardDate | ||
| Which is the degree of certainty of the date? | plucky:entity | plucky:has_certainty_degree | EAD:date certainty | ||
| What is the date's relation with a resource? | plucky:entity | plucky:has_resource_relation | |||
| --- What is the type of relation with the resource? | plucky:relation_type | EAC-CPF: resourceRelationType | |||
| --- What is the resource related? | plucky:relation_resource | DCTERMS:relation | |||
| --- What does that relation mean? | plucky:relation_meaning | CDWA:[4.2.3 Date Qualifier] | CDWALITE:dateQualifier | ||
| --- When did this relation start? | plucky:relation_start | DC:date | |||
| --- Which is the date of creation of the archival resource? | plucky:resource_archiving_date | EAD:<date> or *CDWA [25.5. Cataloging Date] | |||
| --- Which is the date of the last update of its status? | plucky:update_date | CDWA: [15.4. Latest Date] | CDWALITE:latestDate | ||
| What is the date's relation with an agent? | plucky:entity | plucky:has_agent_relation | |||
| --- What is the type of relation with the agent? | plucky:relation_type | ISAAR: [5.3.2 Category of relationship] | EAC-CPF:cpfRelation cpfRelationType="[value]" | ||
| --- What is the person/corporate body related? | plucky:relation_agent | ISAAR: [5.3.1 Name/Identifier of the related corporate body, person or family] | EAC-CPF:cpfRelation | ||
| --- What does that relation mean? | plucky:relation_meaning | CDWA:[4.2.3 Date Qualifier] | CDWALITE:dateQualifier | ||
| ---What were their life roles on that date? | plucky:has_life_role | ISAAR: [5.2.5 Functions, occupations and activities]: write the function etc. | EAC-CPF:function | ||
| What is the date's relation to an event? | plucky:entity | plucky:has_event_relation | |||
| --- What is the related event? | plucky:related_event | EAD:<event> | |||
| --- What are other versions of the name of the event? | plucky:has_other_name | ISAAR: [5.1.5 Other forms of name]: report the other names again in the form of the authority record | EAC-CPF:<nameEntry> or <nameEntryParallel> with <alternativeForm> | ||
| --- What does that relation mean? | plucky:relation_meaning | CDWA:[4.2.3 Date Qualifier] Data Qualifier: | CDWALITE:dateQualifier | ||
| --- Where? | plucky:event_place | EAD:<place> | |||
| Which resources refer to the same date? | plucky:entity | plucky:sameAs | OWL:sameAs | ||
| Which resource has the date as primary topic? | plucky:entity | plucky:isPrimaryTopicOf | FOAF:isPrimaryTopicOf |