How to validate for-each path

Question

I have following for-each path:
<?for-each:G_ACCT/LIST_G_INVOICENUM/G_INVOICENUM?>
However, sometimes there is no data for child group LIST_G_INVOICENUM. I want to check if no child group, then change the path to
<?for-each:G_ACCT?>
Is there a way to check the path exist or not?
Thanks.

Answer 1

It is like one parent have lot of kids. Now they want to show parent name for each kid.
<?for-each:G_ACCT?>
      display acct related infor here
      <?for-each:./LIST_G_INVOICENUM/G_INVOICENUM?>
         display invoice related info here
You can display all parent and grand parents here
      <?end for-each?>
<?end for-each?>
End user wants the parent elements being repeated. If I do the second for-each inside the first for-each, parent element will not be repeated.
will be repeated if you include the element with correct path
+<?for-each:G_ACCT/LIST_G_INVOICENUM/G_INVOICENUM?>+
However, sometimes there is no data for child group LIST_G_INVOICENUM. I want to check if no child group, then change the path to
+<?for-each:G_ACCT?>+
Is there a way to check the path exist or not?
<?if:/G_ACCT/LIST_G_INVOICENUM/G_INVOICENUM?> -- will return true if the element exists else falsewhy do you want to change the path ? i guess to display at least parent info