It occurs to me that some of the issues covered by the WS-DAI properties are perhaps worthy of more general discussion in the architecture: 1. Derived data resources. WS-DAI has properties that show whether updates to a child are reflected in the parent and vice-versa. I think we mention derived data in passing; we could say more about it and treat it more consistently. 2. Concurrent access and local transaction support. ByteIO deliberately says nothing about concurrent access; we should at least mention this. Possible we should consider these issues across all data services? The discussion of distributed transactions in 3.9 should mention the WS-DAI support for local transactions. 3. The WS-DAI CoreResource interface handles mapping from abstract names to addresses. We need to understand how this relates to the OGSA naming scheme. 4. WS-DAI defines properties for the name of a resource and a human-readable description of the resource. These seem reasonably generic properties - we (or even the OGSA WG) might want to consider whether they are more widely useful. (Or perhaps we should ask the DAIS WG to explain why they are necessary in WS-DAI if they are not needed anywhere else). Finally, I note that section 11.3 mentions enhanced access operations that would ease the federation of a data resource. This is worth a forward mention from the data access section itself. Dave. -----Original Message----- From: owner-ogsa-d-wg@ggf.org [mailto:owner-ogsa-d-wg@ggf.org] On Behalf Of Dave Berry Sent: 29 June 2006 23:34 To: ogsa-d-wg@gridforum.org Subject: [ogsa-d-wg] New version of architecture document I've uploaded a new version of the architecture document - https://forge.gridforum.org/sf/docman/do/downloadDocument/projects.ogsa- d-wg/docman.root.working_drafts/doc13621/2. Changes: - I've moved some generic description out of the data access section into the introductory sections. - I've tidied the data access section. At least, I think it's tidier; please could the authors take a look and tell me what I've messed up? - I've made the discussion of policies and agreements more consistent throughout the document. This includes moving a list of example policies from the federation section into section 2. - I've tidied the glossary, removing unused items and ensuring that certain other terms are used consistently in the text. Note: where I've copied chunks of text from one place to another, I switched off change tracking because such large deletions and additions don't tell you much. Instead, I've highlighted the text in yellow where it now appears. Still to do (at least): - Add a discussion of interfaces to the data caching section. - Ditto for the replication section. - Revise the metadata catalog section. - Tidy the appendix list of standards. I'm about to go on holiday for a week, so these tasks won't get done for a while. Dave Berry Deputy Director, Research & E-infrastructure Development National e-Science Centre, 15 South College Street Edinburgh, EH8 9AA Tel: +44 131 651 4039