SymMAP.NET

A symbol language is designed to support common algebra-like symbols to operate on graphical objects, such as points and colors, for functions such as aggregation,coloring, or animation.
However, the initial support of SymMAP.NAT on symbol languages is very primitive. For now, only the following symbol operation are supported:
p(lat,lon) : define a point with lat and lon. The point name can be any name, preferrably lower case for the first letter.
A[p1, p2, ..., pn] : A represents one set of points, while p* (or any name, preferrably lower case for the first letter) represents n points. Define a set A with n points.
A+B: A represents one set of points, while B represents another set. Applying '+' symbol will aggregate A and B and assign the results to A.
A-B: Similarly, Applying '-' symbol will remove the common subset of A and B from A, then assign the results to A.
*c: c represents a Color object. Applying '*' symbol to c will set the color of all point set.
etc.