Allows you to create a relationship between data elements inside of your data source. This is used when representing parent-child items inside the grid.
Example:
<Relations>
<Relation>
<Parent>
<Name>Parent1</Name>
<Keys>
<Key>ParentID</Key>
</Keys>
</Parent>
<Child>
<Name>Child1</Name>
<Keys>
<Key>ChildID</Key>
</Keys>
</Child>
</Relation>
<Relation>…</Relation>
</Relations>