...
When the metadata changes for a record one of our supported Events is generated. The most common case concerns events of type UPDATE or UPDATE are generated.<SUBTYPE>. MediaHaven calculates the changes in the metadata and persistent persists those changes as property of the event.
...
The change in metadata of a record is modelled as a list of changes to its Metadata Fields. Each change to a metadata field contains as a property the value before and after. Because the calculation of the difference is intrinsically linked with the Metadata Inheritance, the same rule applies, namely that the change is calculated per top field and concerns the complete field. For example when adding a keyword “C” to a record with existing keywords “A, B”, the value before is “A, B” and the value after is “A, B, C”.
JSON
...
Output
The difference is outputted in the following contexts
Visible in the front-ends MediaHaven 2.0 and MediaHaven Monitoring
The MediaHaven REST API endpoint
eventsThe OAI PMH API with format “mets-mhs-head” and “mets-mhs”
When exporting a record with the combine option
ZipTreewith metadata formatMetsMhsTreeHeador requesting it with metadata in the format “mets-mhs-head” and “mets-mhs”Visible in the front-ends MediaHaven 2.0 and MediaHaven Monitoring the formatMetsMhsHeadWhen requesting Webhooks using the format
XmlPremisV3
JSON (output example)
| Code Block |
|---|
{
"Difference": [
{ "DottedKey": "Descriptive.Keywords",
"ValueBefore": {
"Keyword": [
"Beekje",
"Leopoldskanaal"
]
},
"ValueAfter": {
"Keyword": [
"Beekje",
"Leopoldskanaal",
"Krekenroute"
]
}
},
{ "DottedKey": "Internal.ArchiveStatus",
"ValueBefore": "in_progress",
"ValueAfter": "on_disk"}
]
} |
XML (output example)
| Code Block |
|---|
<premis:eventDetailInformation>
<premis:eventDetail>on_disk</premis:eventDetail>
<premis:eventDetailExtension>
<mhs:Difference xmlns:mhs="https://zeticon.mediahaven.com/metadata/24.1/mhs/">
<mhs:MetadataFieldChange>
<mhs:DottedKey>Descriptive.Keywords</mhs:DottedKey>
<mhs:ValueBefore>
<mh:Keyword>Beekje</mh:Keyword>
<mh:Keyword>Leopoldskanaal</mh:Keyword>
</mhs:ValueBefore>
<mhs:ValueAfter>
<mh:Keyword>Beekje</mh:Keyword>
<mh:Keyword>Leopoldskanaal</mh:Keyword>
<mh:Keyword>Krekenroute</mh:Keyword>
</mhs:ValueAfter>
</mhs:MetadataFieldChange>
<mhs:MetadataFieldChange>
<mhs:DottedKey>Internal.ArchiveStatus</mhs:DottedKey>
<mhs:ValueBefore>in_progress</mhs:ValueBefore>
<mhs:ValueAfter>on_disk</mhs:ValueAfter>
</mhs:MetadataFieldChange>
</mhs:Difference>
</premis:eventDetailExtension>
</premis:eventDetailInformation> |