IQ gives us many ways to group related items together, including parent-child links, tags, fields.  I had a thought about how the parent-child link might have an advantage over using tags or fields.  If you group (Level 2) related items under a (Level 1) parent item, you can arrange them in any order, and that order of subitems under that parent will be retained.  And an item may have multiple parents, each with its own ordering of its subitems.  An item may appear in one place under one parent and a different place under another parent.  I don't think you can do this with tags or fields, though of course you can do things with subtags or subfields.  True?

But I'm thinking that this ordering capability would only extend to the first level of subitems (Level 2) under a parent item (Level 1).  As for the order of items (Level 3) under a subitem (Level 2), this ordering belongs to that Level 2 item.  So if you change the ordering of the Level 3 items under a Level 2 item, those Level 3 items would have same order whereever that Level 2 item appears.  You couldn't have a different ordering of Level 3 items under one Level 1 item, but a different ordering under a different Level 1 item.  True?