text: A question was asked in the SharePoint 2010 Infopath forums:
  "I am using Infopath2010 and developing a form where there are multiple sections. In each section I have a from date and to date controls.My requirement is to takecare the same date range should not fall in anyother sections."
  I went crazy and decided to took on the challenge, I started with 2 tips:
  - The Infopath codeless programmer - how to do DateDiff with Infopath rules.
  - How to use Preceding:: to check previous repeating sections
  The XSN template is here:
  - Use DateDiff - calculate date difference between Begin & Epoch
  - Again for End & Epoch
  - Use Preceding rule to calculate max date difference in previous "End From Epoch"
  - Validation rules kick off when datediff for the current section is less than the max from previous section