internal CompiledExpression CompileExpression(string expression, bool isKey)
{
if (expression == null || expression == "")
{
return(null);
}
Expression expr = xpathParser.Compile(expression);
if (isKey)
{
expr = new ExprKeyContainer(expr);
}
CompiledExpression e = new CompiledExpression(expression, expr);
return(e);
}