Description

An array of 2 integers used to represent one component of a simple or hierarchical TopoGeometry.

In the case of a simple TopoGeometry the first element of the array represents the identifier of a topological primitive and the second element represents its type (1:node, 2:edge, 3:face). In the case of a hierarchical TopoGeometry the first element of the array represents the identifier of a child TopoGeometry and the second element represents its layer identifier.

	For any given hierarchical TopoGeometry all child TopoGeometry elements will come from the same child layer, as specified in the topology.layer record for the layer of the TopoGeometry being defined.

Examples

SELECT te[1] AS id, te[2] AS type FROM
( SELECT ARRAY[1, 2]::topology.topoelement AS te ) f;

 id | type
----+------
  1 |    2
                 

SELECT ARRAY[1, 2]::topology.topoelement;

  te
-------
 {1,2}
                 

This example shows what happens when casting a three-element array to topology.topoelement. The domain requires a two-element array, so the dimension check fails.

SELECT ARRAY[1, 2, 3]::topology.topoelement;

ERROR:  value for domain topology.topoelement violates check constraint "dimensions"

See Also

GetTopoGeomElements, TopoElementArray, TopoGeometry, TopoGeom_addElement, TopoGeom_remElement