Hi folks,

(To address my actions from the last DMI phone conf):

As you are aware, I have been given the task to come up with a straw-man proposal for a ‘bulk’ data copy activity document prior to OGF that may/may not build upon on the DMI functional spec (for the purpose of describing multiple data copy operations across different sources and sinks).  I would appreciate your views/preferences on the following salient points before I start this task (I also emailed Andreas and Donal from JSDL to canvas their opinions also – awaiting a reply).

Anyhow, I guess the salient points as discussed in the paper that need an early decision are listed below (note, if you would like a copy of the cited paper please email me directly, I’ll send you a copy since its awaiting final publication review):

1)      The preferred format to pursue to describe the data source and sink? i.e. a) the jsdl inspired <mjsdl:DataTransfer/> element with nested <mjsdl:Source/> and <mjsdl:Target> elements (http://code.google.com/p/dtsproject/source/browse/trunk/dts-schema/src/main/resources/minx-jsdl-example.xml ), or b) the DMI inspired <DataCopy/> element based on DEPRs as shown in Fig 4 in the paper.

2)      Should we pursue the use of element references as discussed in Figure 5 in the paper to reduce XML repetition (i.e. support references in addition to the traditional in-line approach)?  Potential referenced elements include; <Source/>, <Target /> (assuming option 1a), <DataERP/> (assuming option 1b), <TransferRequirement/>, <URIProperties/> and <Credentials/>.

Some considerations:

If option 1a) is preferred, do we further extend this so that it can be used to reference multiple alternative source/sink data locations akin to the dmi DEPR construct, i.e. allow multiple <mjsdl:Source/> and/or <mjsdl:Target/>  data locations within a single <mjsdl:DataTransfer/>. In doing this, we actually define a construct very similar to the DEPR construct.

Many thanks,

Dave

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David Meredith

STFC eScience Centre

Daresbury Laboratory (A32)

Warrington, Cheshire

WA4 4AD

email: david.meredith@stfc.ac.uk

tel: +44 (0) 1925 603762

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