Modelling

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Basic ontology

On the top of the Metabase ontology is the following item:

Which has the immediate sub-item:

Query to find all items that are instance of (P5) or one or the other: 

PREFIX wd: <https://metabase.wikibase.cloud/entity/>
PREFIX wdt: <https://metabase.wikibase.cloud/prop/direct/>

SELECT ?item ?wikidata_iri ?itemLabelEN ?itemLabelSV ?itemDescEN ?itemDescSV
WHERE
{
  {?item wdt:P5 wd:Q3.}
  UNION
  {?item wdt:P5 wd:Q10.}
  OPTIONAL {?item wdt:P1 ?wikidataQ}
  BIND(URI(concat("http://www.wikidata.org/entity/", ?wikidataQ)) AS ?wikidata_iri)
  OPTIONAL {?item rdfs:label ?itemLabelEN filter (lang(?itemLabelEN) = "en")}.
  OPTIONAL {?item rdfs:label ?itemLabelSV filter (lang(?itemLabelSV) = "sv")}.
  OPTIONAL {?item schema:description ?itemDescEN filter (lang(?itemDescEN) = "en")}.
  OPTIONAL {?item schema:description ?itemDescSV filter (lang(?itemDescSV) = "sv")}.
}

Try it!


Properties

Whenever possible, we aim to create properties whose scope duplicates that of properties in Wikidata. By using sameAs on Wikidata (P1), we then link to the equivalent Wikidata property. This lowers the threshold for Wikidata editors to start participating.

For example: organizer (P14), language of work or name (P20), number of participants (P28).

Metabase internal properties

We sometimes have a need for properties that do not have direct equivalents on Wikidata. For example when we need to describe the activities of the Wikimedia movement in more detail than what's relevant for Wikidata.

These properties shall have instance of (P5) → Metabase internal property (Q24).

For example: WMSE project ID (P9), Wikimedia platform(s) affected (P13), sorted under programmatic area (P10).

Temporary free text fields

Occasionally, we might need to temporarily store a piece of information in free text format, e.g. if we're unsure what item to use or if it does not exist yet.

We use the property temporary free text field (P38) for this. It should be accompanied by the qualifier replaced by property (P41) that states what property should replace it.

Compare the property name string on Wikidata.

SPARQL

Query to find all internal properties: 

PREFIX wd: <https://metabase.wikibase.cloud/entity/>
PREFIX wdt: <https://metabase.wikibase.cloud/prop/direct/>

SELECT ?item ?itemLabelEN ?itemLabelSV ?itemDescEN ?itemDescSV
WHERE
{
  ?item wdt:P5 wd:Q24.
  OPTIONAL {?item rdfs:label ?itemLabelEN filter (lang(?itemLabelEN) = "en")}.
  OPTIONAL {?item rdfs:label ?itemLabelSV filter (lang(?itemLabelSV) = "sv")}.
  OPTIONAL {?item schema:description ?itemDescEN filter (lang(?itemDescEN) = "en")}.
  OPTIONAL {?item schema:description ?itemDescSV filter (lang(?itemDescSV) = "sv")}.
}

Try it!


Query to find all temporary free text fields: 

PREFIX wb: <https://metabase.wikibase.cloud/entity/>
PREFIX wbt: <https://metabase.wikibase.cloud/prop/direct/>
PREFIX wbp: <https://metabase.wikibase.cloud/prop/>
PREFIX wbpq: <https://metabase.wikibase.cloud/prop/qualifier/>
SELECT DISTINCT ?item ?itemLabel ?val ?qual ?qualLabel
WHERE
{
?item wbt:P38 ?val.
OPTIONAL {?item wbp:P38 ?statement.
?statement wbpq:P41 ?qual .}
     
SERVICE wikibase:label { bd:serviceParam wikibase:language "sv,en". }
}

Try it!


Metabase vs. Wikidata

As we do not aim to duplicate the information on Wikidata, there's a number of item types that only contain a Wikidata QID, using sameAs on Wikidata (P1). These are:

By using federated queries, we can still access information about these types of entities from Wikidata, without hosting the data ourselves.

See some examples of federated queries.

Index terms

An index term (Q12) is a keyword that we use to describe e.g. the topic of a document or the focus area of a project.

For example: museum collection (Q18), public art (Q39), authority control (Q17).

Organizations

An organization (Q13) could be a Wikimedia chapter, a GLAM or any other organized social entity.

For example: Wikimedia Foundation (Q50), Wikimedia Sverige (Q9), Nationalmuseum (Q15).

Humans

We only create items about people when these are needed to describe authorship/speaker/event or project responsibility. And only when this information is already publicly available, any affiliation would also need to have been publicly communicated. Since the main affiliation might not always apply, it can be superseded by a qualifier on an item-by-item basis.

For example: Alicia Fagerving (Q46), André Costa (Q30).

Item types primarily offloaded on Wikidata

For the following item types we expect little or no information on Metabase. Required are only sameAs on Wikidata (P1) and instance of (P5) if they exist on Wikidata.

  • Organizations
    • If not on Wikidata, consider if it might anyway be relevant for Wikidata. Else add a Label and an additional instance of (P5) statement to an index term describing the type of organisation.
  • Locations: It is enough to stay at a town level of granularity, e.g. Stockholm (Q78) rather than Norrsken House. This is enough to get an insight about the geographical spread of activities.
  • Humans
    • If not on Wikidata, see humans for allowed modelling.

Metabase-specific items

Projects

A project could be:

  • a formal one officially implemented by an organization (a Wikimedia chapter, a GLAM, or other)
  • an informal one implemented by a self-organized group (such as participants in a Wikiproject), or an individual (a volunteer Wikimedian)

See the following:

Documents

See the following:

Activities and events

See the following:

See also

  • Since wikibase.cloud does not support Constraints, these are instead listed on Rules and displayed on the talk page of the concerned Properties and items.
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