https://wiki.ext-9.eprints-hosting.org/w/index.php?action=history&feed=atom&title=Relation_fieldRelation field - Revision history2026-05-10T21:26:21ZRevision history for this page on the wikiMediaWiki 1.43.6https://wiki.ext-9.eprints-hosting.org/w/index.php?title=Relation_field&diff=15868&oldid=prevDrn@ecs.soton.ac.uk: Added relation metadata field type2023-04-10T23:29:17Z<p>Added relation metadata field type</p>
<p><b>New page</b></p><div>{{fieldtypes}}<br />
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== Description ==<br />
This field is derived from a [[Compound field]] to store for relations. It contains to sub-fields: <code>uri</code> that store a URI for the object that is related and <code>type</code> for the type of relationship.<br />
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== Inheritance ==<br />
* [[Metadata]]<br />
** [[Compound field]]<br />
*** [[Relation field]]<br />
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== Additional Properties ==<br />
As for [[Compound field#Additional_Properties|Compound fields]].<br />
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== Required Phrases ==<br />
In addition to [[Compound field#Required_Phrases|Compound fields phrases]], sub-field name phrases are needed for <code>uri</code> and <code>type</code>. In the forms:<br />
dataset_id + "_fieldname_" + fieldname + "_uri"<br />
dataset_id + "_fieldname_" + fieldname + "_type"<br />
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== Database ==<br />
Relation fields are stored in the database as:<br />
fieldname_uri VARCHAR(255)<br />
fieldname_type VARCHAR(255)<br />
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== API ==<br />
See [[API:EPrints/MetaField/Relation|API page]].<br />
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== Examples ==<br />
Most basic example.<br />
{<br />
name => 'relation',<br />
type => 'relation',<br />
}<br />
Storing multiple relations.<br />
{<br />
name => 'relations',<br />
type => 'relation',<br />
multiple => 1,<br />
}</div>Drn@ecs.soton.ac.uk