Name
TopoElement — An array of 2 integers generally used to identify a TopoGeometry component.
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.
![[Note]](../images/note.png)
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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}
--Example of what happens when you try to case a 3 element array to topoelement
-- NOTE: topoement has to be a 2 element array so fails dimension check
SELECT ARRAY[1,2,3]::topology.topoelement;
ERROR: value for domain topology.topoelement violates check constraint "dimensions"