Implications of removing $has$a

[Markus Sabadello <markus.sabadello@xdi.org>]

Hi,

I tried removing $has$a from XDI4j (http://wiki.eclipse.org/XDI4j) to see what it breaks.
Actually I found only one piece: Versioning

In XDI Versioning we were using $has for "version snapshots" and $has$a for "version logs".

- A "version snapshot" is a complete copy of a subject at a given version
- A "version log" is a copy of the XDI message that produced the given version

We had a nice wiki page about this, but somehow I can't find it right now.

Anyway, here is an example XDI document with 2 versions of =markus, complete with "version snapshots" and "version logs":

=markus
��� +name
��� ��� "Markus Sabadello"
��� $has
��� ��� $v
��� $v
��� ��� !2
��� +friend
��� ��� =drummond
=markus$v
��� $has
��� ��� !2
��� =markus$v!1
��� ��� /
��� ��� ��� =markus
��� ��� ��� ��� $add
��� ��� ��� ��� ��� /
��� ��� ��� ��� ��� ��� =markus
��� ��� ��� ��� ��� ��� ��� +name
��� ��� ��� ��� ��� ��� ��� ��� "Markus Sabadello"
��� $has$a
��� ��� =markus$v!2
��� =markus$v!2
��� ��� /
��� ��� ��� =markus
��� ��� ��� ��� $add
��� ��� ��� ��� ��� /
��� ��� ��� ��� ��� ��� =markus
��� ��� ��� ��� ��� ��� ��� +friend
��� ��� ��� ��� ��� ��� ��� ��� =drummond
=markus$v!1
��� +name
��� ��� "Markus Sabadello"
=markus$v!2
��� +name
��� ��� "Markus Sabadello"
��� +friend
��� ��� =drummond

My guess is that we can simply leave out the one $has$a statement, since it doesn't really add much additional information anyway. But maybe someone has a better idea...

Markus