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Question about Entity and its relationship with Extension
by David Horat 16 Apr '09

16 Apr '09

In the GLUE Specification v. 2.0, page 8, it is specified the Entity class. In its "Association.End" there is just one field: "Extension.Key", but in the Extension class, its unique identifier is "LocalId". So in the Entity class, it should be specified "Extension.LocalId" instead of "Extension.Key". "Extension.Key" shouldn´t be used because of its description, which I quote here: "This identifier is not required to be unique; several instances of this class MAY hold the same value of this attribute". So this could be another erratum, isn´t it? Regards, David -- David Horat Software Engineer specialized in Grid and Web technologies IT Department – Grid Deployment Group CERN – European Organization for Nuclear Research » Where the web was born Phone +41 22 76 77996 http://davidhorat.com/ http://cern.ch/horat http://www.linkedin.com/in/davidhorat

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More on location: WOEID
by Paul Millar 15 Apr '09

15 Apr '09

Hi all, There's an interesting audio interview with Tyler Bell on O'Reilly Radar about how to specify geographical location. In the interview, Tyler talks about Yahoo's approach: http://radar.oreilly.com/2009/04/where-20-preview---tyler-bell.html In brief, they define a unique 32-bit number to each location: the "Where On Earth ID" or "WOEID". They also provide a public, restful API to query their database to extract metadata about the area. Details are available here: http://developer.yahoo.com/geo/ http://developer.yahoo.com/geo/guide/ One of the nice features of this is one can express low-granularity information (such as a city, county or country) without having to specify a (potentially meaningless) centroid lat./long. ordered pair. This is nice as they also expose their semantic structure, so one can (for example) discover that Canada is within the United States. I propose in the next version of GLUE we add an optional field called woeid so people have a standard field to include the WOEID, if they choose to do so. Cheers, Paul.

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Question about LocalId_t
by David Horat 30 Mar '09

30 Mar '09

Hello guys, The LocalId attribute of the Extension class specified in page 8 of the GLUE 2.0 Specifications is of type LocalId_t. The LocalId_t is specified in page 72, which basically says that is must be a string that starts with a-zA-Z and the following characters can be into a-zA-Z_0-9. I am just curious to know why did you apply this restriction. I am sure there is a good reason behind it. Regards, David -- David Horat Software Engineer specialized in Grid and Web technologies IT Department – Grid Deployment Group CERN – European Organization for Nuclear Research » Where the web was born Phone +41 22 76 77996 http://davidhorat.com/ http://cern.ch/horat http://www.linkedin.com/in/davidhorat

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Tighten defn of Country property?
by Paul Millar 30 Mar '09

30 Mar '09

Hi all, Current defn of Location.Country is simply "Name of country." However, this can lead to confusion. Is the United States of America "US", "USA", "United States", "United States of America"? Is the United Kingdom represented by "GB", "GBR", "UK", "U.K." etc. Perhaps we should clarify this. I would change the definition to: Name of country. The value SHOULD be the country's ISO 3166-1 Alpha-3 code. (we could use any code, but ISO 3166-1 Alpha-3 seems appropriate). Cheers, Paul.

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Question about the way of specifying relationships
by David Horat 27 Mar '09

27 Mar '09

In the GLUE Specification v. 2.0, in the association end list, relations are always specified with the attribute they have to link with. (E.g. Service.ID) This is not correct because of several reasons: - In the Entity-Relationship models, you just specify relationship between entities/classes/objects, without any knowledge of each of the attributes in them. - To know which attribute you want to link with from the related object, you should have to take a look of its definition to get the key fields. - The key fields could be more than one. Sometimes the key of an entity is a combination of several fields, so the current way of visualizing relations will be broken. I suggest just taking out every attribute in all the Association End list to comply on how to use this kind of diagrams, to avoid problems in the future with multiple key fields. Regards, David -- David Horat Software Engineer specialized in Grid and Web technologies IT Department – Grid Deployment Group CERN – European Organization for Nuclear Research » Where the web was born Phone +41 22 76 77996 http://davidhorat.com/ http://cern.ch/horat http://www.linkedin.com/in/davidhorat

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Admin needed: Lack of permissions commiting to GLUE SVN
by David Horat 25 Mar '09

25 Mar '09

Hello all, I just tried to commit for the first time to the GLUE SVN and this is what it happens: horat@horat-hpnc6220:~/gridsrc/glue$ svn commit --username horat svn: Commit failed (details follow): svn: Server sent unexpected return value (403 Forbidden) in response to MKACTIVITY request for '/svn/repos/glue/!svn/act/1e158427-8963-49f4-8251-ec5b4fb8bb27' It seems that the *authentication* succeeded, but the *authorization* was unsuccessful, thus it may be due to a lack of permissions. Can any admin give me permissions to commit to the GLUE repository? My username is "horat". Regards, David -- David Horat Software Engineer specialized in Grid and Web technologies IT Department – Grid Deployment Group CERN – European Organization for Nuclear Research » Where the web was born Phone +41 22 76 77996 http://davidhorat.com/ http://cern.ch/horat http://www.linkedin.com/in/davidhorat

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Question about multiplicity in GLUE 2.0 Specification
by David Horat 25 Mar '09

25 Mar '09

Hello all! :) On GLUE 2.0 Specification v. 2.0 from 3rd March 2009, which is the latest, I see that the multiplicity field is specified as '*', '0..*' or '1..*'. I assume that '*' is the same as '0..*' as this is the standard convention. Anyway it should be good to concrete it for every field and just have either '0..*' or '1..*'. So, is this specification still open for little changes like this? Regards, David -- David Horat Software Engineer specialized in Grid and Web technologies IT Department – Grid Deployment Group CERN – European Organization for Nuclear Research » Where the web was born Phone +41 22 76 77996 http://davidhorat.com/ http://cern.ch/horat http://www.linkedin.com/in/davidhorat

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Implementations page
by Sergio Andreozzi 05 Mar '09

05 Mar '09

dear all, based on the yesterday GLUE implementation session, I've drafted a wiki page where all the implementation activities can be tracked: http://forge.ogf.org/sf/wiki/do/viewPage/projects.glue-wg/wiki/ListOfImplem… Please, fill the missing fields or add more lines where it applies. Cheers, Sergio

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send info about your implementation activity of GLUE
by Sergio Andreozzi 04 Mar '09

04 Mar '09

Dear all, during the today GLUE implementations session, we would like to list all the ongoing implementation activities. If you or other members of your organization are implementing GLUE, please come to the session and tell us about the ongoing work. You are also welcome to bring slides, if available. For those who are not present, but are implementing GLUE, you can send me few lines by email describing the context, status, timeline and issues in your work. Here is the link for the session: http://www.ogf.org/gf/event_schedule/index.php?id=1553 Cheers, Sergio

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GLUE Specification V. 2.0 Published
by Sergio Andreozzi 03 Mar '09

03 Mar '09

Dear all, it is with great pleasure that I inform you about the publication of the GLUE Specification V.2.0. This work started more than two years ago at OGF19 and consolidates several years of experience of different groups as regards the modeling of Grid resources for discovery and resource selection. The final document is the OGF Proposed Recommendation GFD.147 available at the following URL: http://www.ogf.org/documents/GFD.147.pdf In this work, I want to thank all the persons who have contributed their expertise, time and energy for this important milestone. A special thanks to all the co-authors who have regularly attended more than 60 telecons and that have provided their valuable and essential contribution. The work will continue with the completion of the renderings to concrete data models which will follow in the next weeks. The rendering document was split by concrete data model so that each of them can go for an independent standardization process. You can find the related documents at the following URL: http://forge.gridforum.org/sf/docman/do/listDocuments/projects.glue-wg/docm… Looking to meet many of you at the tomorrow GLUE sessions: http://www.ogf.org/gf/event_schedule/index.php?id=1552 http://www.ogf.org/gf/event_schedule/index.php?id=1553 Cheers, Sergio

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