Help:Sequence map

The sequence map1 is a feature added with Semantic MediaWiki 3.1.0Released on 23 September 2019 and compatible with MW 1.31.0 - 1.33.x. and can assign an attributive characteristic to a property so that annotated values do appear in the same sequence (order) during an output as there were added during the input.

Usage

Create a "PROPERTY_PROFILE_SCHEMA" schema that defines the sequence map.

{
    "type": "PROPERTY_PROFILE_SCHEMA",
    "profile": {
        "sequence_map": true
    },
    "tags": [
        "property profile"
    ]
}

Following the creation of a profile schema, assign the profile to a property using the declarative Profile schema property. The specific profile is only created once and can be reused for other properties that want to make use of this feature.

Note

Once a profile schema is added to a property with special property "Profile schema"Holds the name of a profile schema which declares characteristics for annotations maintenance script "rebuildData.php"Allows to rebuild all the semantic data for a selected data backend/store has to be run as this requires to build up the new database table "smw_object_aux" with it's field "smw_seqmap" from the ground.2

Technical notes

A property with a "sequence map" attribute will signal to the Storage Engine to store an additional map of hashed values (see database table "smw_object_aux"3) together with their sequence so that annotated values can appear in the same order as there were annotated.