Adds an element to a topology.
(tpm_editaddelem tpm_id type elem)
Returns T or nil.
| tpm_id | Topology ID (real). |
| type | Element type code (integer): 1, 2, or 3, where 1 = Node, 2 = Link, and 3 = Polygon. |
| elem | Element to add. Depending on the type argument, specify one of the following: If 1, specify a point or the entity name of a point object. If 2, specify the entity name of a line object. If 3, specify a selection set. |
The topology must be open with Write access. If you add a node to a link, the link is split.