On 19 September 2011 15:15, Ghislain Fourny <> wrote:
> Hi Andrew,
>
> Sure. In the XML Time Machine, the XDM (data model) is augmented with an additional dimension: time. This means that a node (in the XDM spacetime) is identified with two coordinates:
>
> 1. a reference URI
> 2. a version URI
>
> The reference URI corresponds to the concept of node identity in the XDM specification. A node that evolves according to the XQuery Update specification (meaning that its accessors are modified, e.g., children added/removed, node renamed) corresponds in the XML Time Machine to a series of nodes that share the same reference URI, but have different version URIs. Such a series of nodes is called a node timeline.
>
> Using time axes means navigating within a timeline. Given a node in version 10, it is possible to get the "same" node in version 5. The concept of node identity in the XDM specification allows to give a meaning to "same".
>
> Does it make sense?
ah ok - so provided the document is only modified using XQuery Update
then you can track the changes over time?
--
Andrew Welch
http://andrewjwelch.com
