Adding reltables to your DITA Maps.

Why are reltables better than related links in topics?

Reference presentations:

• Overview of best practices for using ditamaps and relationship tables to manage linking.
  Presented at the Silicon Valley DITA Interest Group on 2005-07-13. Carolyn Henry, IBM.
• DITA Links and Relationship Tables
  Presented at the Denver/Boulder DUG October, 2007. Scott Stark, IBM.