/// <summary>
/// Validate a context item expression.
/// </summary>
/// <param name="e">
/// is the expression. </param>
/// <returns> null. </returns>
public virtual object visit(CntxItemExpr e)
{
return(null);
}
/// <param name="e">
/// is the Cntx Item Expression. </param>
/// <returns> new function </returns>
public virtual object visit(CntxItemExpr e)
{
return(new VarRef(new QName("fs", "dot")));
}
