IRC log of RDB2RDF on 2008-09-19
Timestamps are in UTC.
- 14:58:21 [RRSAgent]
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- 14:58:22 [RRSAgent]
- logging to http://www.w3.org/2008/09/19-RDB2RDF-irc
- 14:58:40 [Ashok]
- meeting: RDB2RDF
- 14:58:52 [Andre1]
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- 14:59:12 [Ashok]
- chair: Ashok
- 15:04:51 [iv_an_ru_]
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- 15:05:48 [soeren]
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- 15:06:08 [Ashok]
- scribenick: soeren
- 15:06:26 [Ashok]
- scribe Soeren Auer
- 15:07:40 [soeren]
- no objections for previous minutes
- 15:08:01 [soeren]
- oct30/31 will be f2f minute organized by wolfgang
- 15:08:11 [soeren]
- wolfgang will send more information
- 15:08:58 [soeren]
- no phone calls for next two weeks and no call 17th and 24th of Oct
- 15:10:04 [soeren]
- jenny green provided interesting use case scenario
- 15:10:33 [soeren]
- orri updated RDB2RDF requirements
- 15:10:53 [juansequeda]
- This is the link from Orri's updated requirement document: http://esw.w3.org/topic/Rdb2RdfXG/ReqForMappingByOErling
- 15:12:17 [soeren]
- discussion about Orri's requirements document
- 15:12:42 [soeren]
- Orri gives an introduction
- 15:16:07 [soeren]
- better definition of the scope of the requirements document
- 15:16:23 [soeren]
- addition of usages scenarios
- 15:16:47 [soeren]
- esp. with regard to mapping on demand
- 15:17:26 [soeren]
- some kind of basic inferencing is required
- 15:17:47 [soeren]
- e.g. when the same triples can be derived from different sources
- 15:19:07 [soeren]
- properties of mapping functions (injective, bijective etc) must be known by the mapping layer
- 15:22:30 [soeren]
- virtuoso provides some of the functionality already
- 15:23:21 [soeren]
- question from Ashok about Simplicity
- 15:23:44 [soeren]
- How can that be achieved?
- 15:24:05 [soeren]
- Orri answers: maybe by two language layers.
- 15:25:40 [soeren]
- often only few simple things are required
- 15:27:29 [soeren]
- Soeren: why not use SQL as a mapping language?
- 15:29:09 [Ashok]
- Ashok: You can define a SQL query for each OWL class
- 15:30:30 [soeren]
- Orri will collect some examples of thnigs which are not easily expressible in SQL.
- 15:33:57 [Ashok]
- Jenny: If you limit mapping to SQL you n only solve problems that SQL can solve
- 15:34:01 [soeren]
- Limitation to SQL can only problems that SQL can solve.
- 15:37:12 [soeren]
- Ashok: benefit of translating from RDB to RDF is integration of data, but the real value is when you can add extra semantic
- 15:38:08 [iv_an_ru_]
- +q
- 15:38:51 [soeren]
- Ivan: SPARQL is easier and simpler to write
- 15:39:23 [soeren]
- Jenny presents her use case:
- 15:40:45 [AxelPolleres]
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- 15:41:03 [soeren]
- create a demonstrator that takes spatial operations into account in RDF
- 15:41:17 [soeren]
- 5 different data sources from different companies
- 15:41:54 [soeren]
- questionnaires and knowledge elicitation techniques employed to create the data
- 15:42:45 [soeren]
- creation of ontologies for the datasources
- 15:42:58 [soeren]
- now merging of the ontologies and data sources
- 15:43:15 [Ashok]
- meeting: RDB2RDF
- 15:43:17 [soeren]
- spatial attributes hae to be considered
- 15:44:23 [soeren]
- SQUIRREL used for linking
- 15:44:55 [soeren]
- starting point are SPARQL queries
- 15:47:02 [soeren]
- one big table for polygons
- 15:47:47 [soeren]
- seven different conditions define what is a field, many different constraints on the metadata
- 15:48:45 [soeren]
- use of Oracle spatial operations
- 15:49:31 [soeren]
- D2RQ used for mapping
- 15:52:36 [soeren]
- no change of underlying data
- 15:53:23 [soeren]
- sometimes preprocessing required
- 15:54:01 [soeren]
- Orri: interesting use-case
- 15:54:51 [soeren]
- Ashok: Excellent use case since it speaks about data from multiple DBs and allows addition of semantics
- 15:55:25 [soeren]
- one more phone call till F2F
- 15:55:33 [soeren]
- 10th of October
- 15:56:00 [soeren]
- continuing discussion of Orri's requirements and Jenny's use case
- 15:56:27 [soeren]
- in the next conf. call
- 15:56:59 [soeren]
- Orri promises additions till next call
- 15:57:34 [Ashok]
- Adjourn
- 15:57:52 [Ashok]
- rrsagent, make logs public
- 15:58:10 [Ashok]
- rrsagent, create minutes
- 15:58:10 [RRSAgent]
- I have made the request to generate http://www.w3.org/2008/09/19-RDB2RDF-minutes.html Ashok
- 18:23:07 [Zakim]
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