RE: [xri-comment] XRD: Comments on xrd-1.0-cd01

[Eran Hammer-Lahav <eran@hueniverse.com>]

> -----Original Message-----
> From: Blaine Cook [mailto:romeda@gmail.com]
> Sent: Friday, October 23, 2009 10:07 AM

> 6 - XRD Sequence
> 
> This seems unnecessary. Applications serving XRD documents that are
> intelligent enough to combine multiple XRD documents should be able to
> combine those documents into a single XRD. Documents that describe
> multiple Subjects with differing Links should be available at
> different URIs. The example I would cite here is HTML; while it might
> have been useful in some contexts to have a multi-document "HTMLS"
> (compare with XRDS), or multi-document feeds like "ATOMS" (MOLECULE?),
> such documents would be more difficult to parse and unnecessarily
> cumbersome for providers and consumers alike.

The ability to chain multiple XRDs (each describing a *different* resource) in a single document is needed by the XRI resolution process. It might also be useful in other cases where multiple XRD documents need to be located in a single document. The main reason it is included is to remove the need for XRI and other applications to define another XML namespace just for that one element.

Feel free to ignore it. LRDD and Host-meta will explicitly require <XRD> to be the root element.

EHL