vertexsmap expression function

Returns a string from a list of strings in a vertex attribute.

This function will return the indexth unique string bound to the given point attribute. Use vertexsnummap to find the total number of unique strings. Note that the exact order of the strings is should not be relied upon. The indexes start with 0 and go to vertexsnummap()-1.

vertexsmap("/obj/geo1/attribcreate1", "foo", 0)