def as_equal_interval(*args, **kwargs):
return _as_classification(Equal_Interval, *args, **kwargs)<EOL>
Generate equal interval classes from the provided queryset. If the queryset
is empty, no class breaks are returned. For more information on the Equal
Interval classifier, please visit:

U{http://pysal.geodacenter.org/1.2/library/esda/mapclassify.html#pysal.esda.mapclassify.Equal_Interval}

@type  queryset: QuerySet
@param queryset: The query set that contains the entire distribution of
    data values.
@type  field: string
@param field: The name of the field on the model in the queryset that 
    contains the data values.
@type  nclasses: integer
@param nclasses: The number of class breaks desired.
@type  geofield: string
@param geofield: The name of the geometry field. Defaults to 'geom'.
@rtype: L{sld.StyledLayerDescriptor}
@returns: An SLD object that represents the class breaks.