/**
 * The equivalent of a SQL expression.
 **/
Sql.Expr = new Class
({
	Extends: Sql.Object
	,Tag: 'sql-expr'
	,Parent: 'operation'
	,Properties:
	{
		operation:
		{
			type: Sql.Operation
			,set: function (x)
			{
				x.exprs.add (this);
			}
		}
	}
});