BPM: How to return the total number of lines in Multiline Container Element

Hi all:

I am trying to follow the following blog to do message splitting:

/people/narendra.jain/blog/2005/12/30/various-multi-mappings-and-optimizing-their-implementation-in-integration-processes-bpm-in-xi

In the blog, total number of messages for Message1 was returned to Count in Message 2.

If I do not want to create message 2, if there any way to return total number lines in multiline elements ? Because this number need to be used to specify in loop condition:

While Indxe != TotalNumberOfLines

...

Thanks

Liang