determine existence of preceding element

Hello and boo to all,
  I'm not seeing the solution at the moment.
  possible scenario (there could be any number of each of the following 
elements):
1       <text:p text:style-name="module-title">
2       <text:p text:style-name="sub-module-title">
3       <text:p>
4       <text:p text:style-name="sub-module-title">
5       <text:p>
6       <text:p>
7       <text:p text:style-name="sub-module-title">
8       <text:p>
9       <text:p>
10      <text:p>
11      <text:p text:style-name="module-title">
12      <text:p text:style-name="sub-module-title">
13      <text:p>
14      <text:p text:style-name="sub-module-title">

  what I need to determine is this:
      what test will tell me if there are any preceding <text:p 
text:style-name="sub-module-title">s which follow the first preceding 
<text:p text:style-name="module-title"> of the currently visited <text:p 
text:style-name="sub-module-title">.  For instance, sub-module-titles on 
lines 4, 7, and 14 above would be true and those on lines 2 and 12 would 
be false
in advance, much thanks,
Matthew L. Avizinis <mailto:mla(_at_)gleim(_dot_)com>
at
Gleim Publications, Inc. <http://www.gleim.com>