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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? Kind regards, Ghislain On Sep 19, 2011, at 3:38 PM, Andrew Welch wrote: >> Also, the XQuery and XPath Data Model has the concept of node identity, of which the versioning system can keep track. > > Can you expand on that a little - how does node indentity in the XDM > help version control? > > > -- > Andrew Welch > http://andrewjwelch.com
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