1 Schemas and GGF James Magowan / IBM March 2002

EDG (Paris) 6 Mar James MagowanSchema and GGF2 Why is this an issue? Interoperability of Grids –DataGrid, PPDG, GriPhyN, iVDGL etc Not specific implementation issue –GMA or MDS What is our long term goal? –Isolated Grids unable to communicate –or VO’s where every VO could potential talk to every other VO by setting up the policy, not by undertaking a large project to solve interoperability issues.

EDG (Paris) 6 Mar James MagowanSchema and GGF3 Problems with Schema’s Naming MetaData implies a structure, e.g. relational, hierarchical. Attribute/Measurement Units Attribute/Measurement Naming Object/Entity Naming Representation of Schema A lot of Schemas out there –Information, Monitoring, Scheduling, Accounting

EDG (Paris) 6 Mar James MagowanSchema and GGF4 DAMED WG Discovery And Monitoring Event Description Working Group Chairs Jennifer Schopf, ANL James Magowan, IBM Dammed if we do –Not everyone will be happy Dammed if we don’t –Never reach our goal of seamless interoperability of grids (one big grid e.g. internet)

EDG (Paris) 6 Mar James MagowanSchema and GGF5 Charter We propose a working group to define a basic set of monitoring event descriptions. These descriptions, or schemas, will describe the information (attributes) associated with a particular data element and will describe conventions for the representation of the value associated with it. The development of this sort of shared vocabulary is essential for interoperability among a growing number of testbeds and projects. This view is supported by the recent proliferation of independent efforts along these lines, both inside and outside the GGF. The aim of this group is to develop standard representations of the most widely used measurement values (the "top N".) From this we envision the emergence of a set of conventions and recommendations that will ease the task of defining richer, domain-specific schemas.

EDG (Paris) 6 Mar James MagowanSchema and GGF6 Milestones Research existing schemas, draft of comparison of some schemas currently in process. –Completion by April 2002 Develop "English" descriptions for the "top N" monitoring elements. This will not cover all future event schema needs, but will rather approach the intuitive subset that is in wide use today. –Completion by May 2002 Map English definitions to basic technologies including LDAP, SQL, XML. –Draft for discussion by GGF-5

EDG (Paris) 6 Mar James MagowanSchema and GGF7 Milestones Evaluate use of data models (for example relational, hierarchical, etc.) –Draft for discussion by GGF-5 Evaluate various data models in light of discovery of available monitoring data. Assuming a distributed infrastructure, mechanisms for discovery of events are non-trivial and various techniques in use will be compared. –Draft for discussion by fall 2002 Evaluate use of schema languages (e.g., GOS / XMLSchema / RDF / CIM) –Draft for discussion by fall 2002

EDG (Paris) 6 Mar James MagowanSchema and GGF8 Simple Steps Links to current Grid schema effort Units and names for basic top n attributes/Measurements More complex entities involving more than one measurement/attribute. Solve Entity Identity Problems

EDG (Paris) 6 Mar James MagowanSchema and GGF9 How to get involved. WP3 can’t do everything. Subscribe to mailing list –damed - –wp3 - ml WebSite – EDG input through WP3 to DAMED

EDG (Paris) 6 Mar James MagowanSchema and GGF10 Future Schemas not covered by DAMED Beyond top n After CE, SE Practice what we learn –Interactions with other grids. GOS no longer the answer to all our schema problems!