Meeting minutes 2012-05-01

All,

The minutes of today's meeting are available for review at [1]. We have resolved all but one issue (Implementability for tables w/o primary key) which mainly Eric, Richard and Juan are trying to resolve till next week over the mailing list.

Cheers,
	   Michael


[1] http://www.w3.org/2012/05/01-RDB2RDF-minutes.html


The WG has taken the following resolutions at today's call:

===
Re: Fixing an omission in R2RML: syntax of blank node labels (http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0060.html):

RESOLUTION: Change Section 11.2 of R2RML http://www.w3.org/TR/2012/CR-r2rml-20120223/#generated-rdf-term)  to:

[[
If the term type is rr:BlankNode: Return a blank node that is unique to the natural RDF lexical form corresponding to value.

NOTE: RDF syntaxes and RDF APIs generally represent blank nodes with blank node identifiers. But the characters allowed in blank node identifiers differ between syntaxes, and not all characters occurring in value may be allowed, so a bijective mapping function from values to valid blank node identifiers may be required. The details of this mapping function are implementation-dependent, and an R2RML processors may have to use different functions for
different output syntaxes or access interfaces. Strings matching the regular expression [a-zA-Z_][a-zA-Z_0-9-]* are valid blank node identifiers in all W3C-recommended RDF syntaxes.
]]


===
Re: Using non-existing column in mapping (http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0018.html)

RESOLUTION: No change.


===
Re: Unnamed columns in rr:sqlQuery http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0017.html

RESOLUTION: Change Section 5.2 of the R2RML spec (http://www.w3.org/TR/2012/CR-r2rml-20120223/#r2rml-views) to:

[[
Any columns in the SELECT list derived by projecting an expression SHOULD be named.
]]


===
Re: XSD mapping for binary columns (xsd:hexBinary vs. xsd:base64Binary) http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0020.html


RESOLUTION: Binary datatypes like BLOB and VARBINARY should be mapped to xsd:hexBinary instead of xsd:base64Binary.


===
Re: DM cannot be implemented as an R2RML mapping (period encoding) http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0021.html

RESOLUTION: The WG agrees to go with http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0070.html



--
Dr. Michael Hausenblas, Research Fellow
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel.: +353 91 495730
WebID: http://sw-app.org/mic.xhtml#i

Received on Tuesday, 1 May 2012 17:34:47 UTC