Attribute lookup tables

Available since Maria GDK 3.1.

Lookup tables are used for mapping feature attribute codes to readable text when performing feature queries on vector maps. These lookup tables are defined in xml-files and should be located together with the map data they relate to (multidatasets). The files use the extension .lookup.xml (f.ex. N500.m6mmultidataset.lookup.xml) (or for tilesets (Maria GDK 4.3+) - <tilesetname>.lookup.xml).

Example:

<lookup>
  <attribute code="FFP" text="Farming Pattern">
    <value text="Linear" code="1"/>
    <value text="Regular" code="2"/>
    <value text="Terraced" code="3"/>
    <value text="Intermingled Woods" code="4"/>
    <value text="Intermingled Trees" code="5"/>
    <value text="Treeless" code="6"/>
    <value text="Trellised" code="7"/>
    <value text="Irregular" code="8"/>
  </attribute>
  <attribute code="FUN" text="Condition of Facility">
    <value text="Under Construction" code="1"/>
    <value text="Abandoned" code="2"/>
    <value text="Destroyed" code="3"/>
    <value text="Dismantled" code="4"/>
    <value text="Proposed" code="5"/>
    <value text="Fully Functional" code="6"/>
    <value text="Ruined" code="7"/>
    <value text="Partially Functional" code="9"/>
    <value text="Partially Destroyed" code="11"/>
    <value text="Damaged" code="13"/>
    <value text="Disused" code="16"/>
    <value text="Planned" code="17"/>
    <value text="Salvaged" code="18"/>
  </attribute>
  <attribute code="DMT" text="Canopy Cover (percentage)"/>
</lookup>

Querying a feature with attribute "FFP, 3" while using this example lookup-table will return the result "Farming Pattern, Terraced".

Lookup table xml

<lookup> is the root of the lookup-xml.

Child element	Description	Properties
attribute	Feature attribute	O R C A

Attribute

Child element	Description	Properties
value	Attribute value	R O A

Attribute	Description	Properties
code	Attribute code
text	Textual translation of attribute code

Value

Attribute	Description	Properties
code	Attribute value
text	Textual translation of attribute value

{Note|The original feature attribute values are available clientside.}}