Class AnyArrayType

object --+    
         |    
      dict --+
             |
            AnyArrayType

Known Subclasses:

BooleanType, FloatType, IntType, StringType

Base class for defining types of Ports which can handle single values
or arrays of arbitrary shape.

this class must be herited only !!!! get inspired by class IntType below

the construcor arguments are:

    name: string used to identify an instance of a AnyArrayType object
          ex: float
          
          you can add the datashape to the name
          ex: float(0,>=3,4,0)' 
          
Multi dimensional arrays can be specified by passing 
a datashape in parenthesis in the form of a string of comma separated 
expressions.  The number of expressions is the number of dimensions. 
Valid expressions are :
    0  : meaning there is no condition on this dimension.
        (in addition, the leading 0 dimensions are optional)
    x  : length of this dimension must be  x
    >x : length of this dimension must be > x
    <x : length of this dimension must be < x 
    >=x: length of this dimension must be >= x 
    <=x: length of this dimension must be <= x 

for instance a list of vertices can be represented by float(0,3)
    float: describe the smalest elementary datum (one coordinate).
           you can introduce your own elementary type 
           (generaly inheriting basic types), this allow you to easily
           define color and shape for this type (see InstancematType below)
           
    3: because there are 3 coordinates per vertex.
    0: because we don't have any limitation on the number of vertices.
       It is a leading 0, therefore this dimension is optionnal
       (meaning: if you're passing a single vertex [x,y,z], 
       your are not oblige to put it in a list. 
       ex: you can give [x,y,z] or [[x,y,z]])