Eco Grid Conference Call Notes 17 Sep 2004

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Participants

Agenda

This is a continuation of the previous agenda.

1. Certificates and authentication
• see CertificateAuthorityDesign for background
2. EcoGrid query semantics
• handling EML version changes (2.0.0 vs. 2.0.1)
• translating EML and Darwin Core metadata queries
3. Update on data query/subset functionality (Tao and Spears)
4. Update on put interface implementation (Zhu)
• Review the 'put' interface via its WSDL
• Review the 'Authentication' interface via its WSDL

Notes

1. Skipping certificates agenda item because brunt and murillo absent -- will reschedule
2. Ecogrid query semantics
• need ontology mapping between standards
• can Sparrow provide the necessary reasoning services?
• probably need to translate metadata instances as well as classes, so may need to populate the reasoner with al of the instance data (e.g., load EML into the reasoner)
• can existing query rewriting systems work? maybe...but probably would need to be customized or extended
• need to discuss with Bertram and Shawn, especially with regards to Sparrow -- this is probably part of SMS layer, but how to deal with instance data (e.g., EML values)
• probably start with just crosswalks, then add instance data later
• implement this as an 'ontology server'
• e.g., takes an EML query in, gives a Darwin Core query back
• Shawn: says we should map to an integrated schema to avoin n^n mappings
• e.g., in ant example paper they map to the ontology
3. Update on data query/subset functionality (Tao and Spears)
• Rod gave an overview of the use of EML Data Source and cached queries
• Matt: can we use the existing Kepler-side infrastructure to implement EcoGrid-side data query by loading the EML-described sources into a relational db
• Jing: still need the DarwinCore Data source
4. Update on put interface implementation (Zhu)
• Bing gave overview of put implementation
• Noted that Metacat identifies metadata and data separately while SRB uses same id for both
• Client works, can use to upload
• Still need to know which system you are using so you use the API correctly
• Bing says this can be fixed on the client side
• Reviewed auth interface -- login, logout, genereates sessionid
• Eventually need to move to SSL for all services so that the communication is secure
• Or use the GSI security layer
• how does this have to change to accomodate certificates?
• once we have certificates, the ldap user DNs can be shared across systems (e.g., SRB, Metacat)
• Need to modify get and query interfaces to accept sessionId to allow for access to private records
• need to allow anonymous query for some systems, should anonomous query and get use a different method or pass in a special userid (e.g., "public")

Action items

1. Matt will contact Bertram and Shawn about query translation needs, involve other EcoGrid folks
• reread Shawn's 'ant' paper for ideas
2. Rod will describe (in a bug) and implement a DarwinCore data source
3. Jing will describe and implement a new multi-node EcoGrid search for Kepler (with resultset integration)
4. Jing: test and install put and auth interfaces for metacat on ecoinfo2
5. Modify get and query interfaces to accept sessionId to allow for access to private records
• Jing will enter a bug describing this
6. Bing will continue registry design and implementation