public CartoDimension(Node value, string unit, NodeLocation index) :
base(value.ToCSS(new Env()), unit)
{
m_index = index;
if ("px".Equals(unit))
Unit = unit.Replace("px", string.Empty);
}
public CartoFilterElement(Node key, Node op, Node value, Combinator combinator, Env env)
: base(combinator, value)
{
m_key = key;
m_op = op;
m_value = value;
m_id = "[" + m_key.ToString() + "]" + m_op.ToString() + m_value.ToCSS(env).ToString();
}