= Topology Editing =


[wiki:UsersWikiPostgisTopology Topology] editing is currently supported by a partial implementation
of ISO SQL/MM specification functions.

You can still use SQL UPDATE,SELECT and DELETE commands, but using SQL/MM functions will provide you with a more stable abstraction, will perform some checks and in some cases automatically update !TopoGeometry composition records.

All SQL/MM functions have the ST_ prefix in addition to being installed under the ''topology'' schema as every other Topology object. Fully implemented editing functions are:

 ST_!InitTopoGeo

  Creates a topology, just a wrapper around !CreateTopology

 St_!AddIsoNode

  Adds an !IsolatedNode

 ST_!RemoveIsoNode

  Removes an !IsolatedNode

 ST_!MoveIsoNode

  Move an !IsolatedNode in space

 ST_!AddIsoEdge

  Adds an !IsolatedEdge

 ST_!RemoveIsoEdge

  Removes an !IsolatedEdge

 ST_!ChangeEdgeGeom

  Updates the [wiki:UsersWikiLineStringGeometry curve geometry] of an [wiki:UsersWikiEdgeElement Edge].

 ST_!NewEdgesSplit

  Splits an !IsolatedEdge with a new [wiki:UsersWikiNodeElement Node].
  The old !Edge will be removed and substituted with the two new Edges resulting from the split.
  Any !TopoGeometry object referring to the old !Edge will be updated to refer to the new Edges.

 ST_!GetFaceGeometry

  Returns a face [wiki:UsersWikiGeometryType Geometry]