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15:57:27 <RRSAgent> logging to http://www.w3.org/2010/08/03-rdb2rdf-irc
15:57:48 <Ashok> zakim, this is rdb2rdf
15:57:48 <Zakim> Ashok, I see SW_RDB2RDF()12:00PM in the schedule but not yet started.  Perhaps you mean "this will be rdb2rdf".
15:58:07 <Ashok> zakim, this will be rdb2rdf
15:58:07 <Zakim> ok, Ashok; I see SW_RDB2RDF()12:00PM scheduled to start in 2 minutes
15:58:12 <alexdeleon> alexdeleon has joined #rdb2rdf
15:58:16 <Ashok> chair
15:58:27 <Ashok> chair: Ashok
15:58:40 <Zakim> SW_RDB2RDF()12:00PM has now started
15:58:42 <whalb> whalb has joined #rdb2rdf
15:58:45 <Ashok> meeting: RDB2RDF
15:58:47 <Zakim> +[IPcaller]
15:59:07 <juansequeda> Zakim, IPcaller is me
15:59:07 <Zakim> +juansequeda; got it
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16:00:04 <Zakim> +Ashok_Malhotra
16:00:41 <Zakim> + +43.316.876.aaaa
16:00:50 <whalb> zakim, aaaa is me
16:00:50 <Zakim> +whalb; got it
16:02:13 <juansequeda> juansequeda has joined #rdb2rdf
16:02:37 <Zakim> +cygri
16:02:54 <cygri> zakim, boris is with me
16:02:54 <Zakim> +boris; got it
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16:03:39 <Zakim> +Souri
16:04:11 <Ashok> present: Juan, Ashok, Wolfgang, Richard, Boris, Souri
16:04:11 <Souri> Souri has joined #rdb2rdf
16:04:22 <Ashok> regrets: Marcelo
16:04:41 <Ashok> zakim, who is on the phone?
16:04:41 <Zakim> On the phone I see juansequeda, Ashok_Malhotra, whalb, cygri, Souri
16:04:43 <Zakim> cygri has cygri, boris
16:05:36 <Ashok> scribenick:  juansequeda
16:05:46 <Ashok> scribe:  Juan
16:06:21 <Ashok> Topic:  Approve minutes of minutes
16:06:27 <Ashok> RES
16:06:27 <juansequeda> +1
16:06:28 <Ashok> ol
16:06:50 <juansequeda> RESOLUTION: Minutes from last meeting July 27 telcon approved
16:07:21 <alexdeleon> alexdeleon has joined #rdb2rdf
16:07:25 <Ashok> Minutes are at:  http://www.w3.org/2010/07/27-rdb2rdf-minutes.html 
16:07:45 <cygri> zakim, who is noisy
16:07:45 <Zakim> I don't understand 'who is noisy', cygri
16:07:49 <cygri> zakim, who is noisy?
16:07:57 <ericP> Zakim, please dial ericP-office
16:07:57 <Ashok> zakim, who is making noise?
16:07:58 <Zakim> ok, ericP; the call is being made
16:07:58 <Zakim> +EricP
16:08:02 <Zakim> cygri, listening for 10 seconds I heard sound from the following: juansequeda (100%)
16:08:11 <Zakim> Ashok, listening for 10 seconds I heard sound from the following: juansequeda (95%), Ashok_Malhotra (38%)
16:08:44 <Ashok> present+: EricP
16:08:51 <juansequeda> TOPIC: SQL Based Approach by Souri
16:10:16 <juansequeda> The approach is taking a SQL query and mapping it to a class and each attribute to a property
16:10:35 <cygri> Souri's slides from the SemTech F2F: http://www.w3.org/2001/sw/rdb2rdf/wiki/File:RDB2RDF_Map_viaSQL_F2F_at_SemTech2010.pdf
16:11:22 <Souri> XML schema: http://www.w3.org/2001/sw/rdb2rdf/wiki/Example_XML_Schema_Mapping
16:13:07 <juansequeda> Souri: what we are presenting comes from the discussions that we have had 
16:13:26 <juansequeda> ... DBKeyType is for definition of primary keys..
16:13:48 <juansequeda> ... RDFTermType are the different types that we can have: IRI, blank node or literal
16:14:27 <juansequeda> ... A SQL query is associated with a ClassMap. it has several properties associated with this class map: object properties and datatype properties
16:15:13 <juansequeda> ... the SQLDefString is required which defines the SQL Query
16:15:53 <juansequeda> ... InstURIPropertyMap: this gives us how to get the URI for a row in the particular table/view
16:16:14 <juansequeda> ... there should be exactly one
16:16:40 <juansequeda> Ashok: is this a database column?
16:16:58 <juansequeda> Souri: yes, it actually is but it is mapped to the identity of a row
16:17:13 <juansequeda> ... the DBColumnName is required
16:18:00 <juansequeda> ... there is InverseExpr, it is for optimizations, but we can discuss about this later
16:18:25 <juansequeda> ... RDFTypeURIPropertyMap: gives us a way to say that a particular row may belong to a class which is defined by a class with values defined in that row
16:19:28 <juansequeda> +q
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16:21:08 <Zakim> +seema
16:21:26 <Ashok> present+: Seema
16:24:03 <ericP> ericP: could you have multiple PropertyMaps with PropertyName=rdf:type instead of RDFTypeURIPropertyMap?
16:24:26 <ericP> Souri: yes, but this approach allows for performance optimizations
16:24:59 <ericP> ... specifically, you can ask for { ?x a ?type } or { ?x a my:SoccerStar }
16:25:48 <juansequeda> juansequeda: or a RDFTypeURIPropertyMap, that means that the object has to be a IRI
16:26:08 <juansequeda> souri: yes
16:27:05 <juansequeda> souri: how do you know which triples belongs to which graph? That is what GraphURIPropertyMap is for
16:27:27 <juansequeda> ... this is optional. you don't have to say this
16:28:46 <juansequeda> ... can also assign columns to a graph
16:29:13 <juansequeda> ... you can divide a row to "column groups"
16:29:39 <juansequeda> ericP: then my SS number can go to the tax graph and personal graph
16:29:42 <juansequeda> souri: yes
16:29:54 <juansequeda> ... useful to organizing datastore
16:30:35 <juansequeda> ... PropertyMap is optional. it has a property name, the DBColumnName and the RDFTerm, so you can say if it should be a IRI, literal or blank node
16:30:50 <juansequeda> ... KeyMap takes care of constraints
16:31:11 <juansequeda> ... Keyname is the name, KeyType which is either a primary, unique or reference. both of these are requireed
16:32:14 <Zakim> +OpenLink_Software
16:32:24 <MacTed> Zakim, OpenLink_Software is temporarily me
16:32:24 <Zakim> +MacTed; got it
16:32:26 <MacTed> Zakim, mute me
16:32:26 <Zakim> MacTed should now be muted
16:32:57 <juansequeda> ... InverseExpr is for perfomance
16:33:17 <juansequeda> ... Richard points out if we need to have classes or not
16:33:54 <juansequeda> ... RDF doesn't have classes. RDFS introduces it
16:34:35 <juansequeda> ... why is it good? if you have the same property repeated in different classes
16:35:07 <juansequeda> +1 to ask what problems can we have if defining classes is required 
16:36:30 <juansequeda> ... having a class, you can restrict your query. you can scope down the space that you have to look for
16:37:39 <juansequeda> ericP: if we don't define a class type, and we do ?s foaf:name ?o then it will be a union of everything that has foafo:name
16:40:34 <Souri> a working example (revised version of the old example we had) -- http://www.w3.org/2001/sw/rdb2rdf/wiki/Revised_Example_of_SQL-Query_based_Approach
16:41:30 <ericP> juansequeda: what are the implications of having typemaps required?
16:42:44 <ericP> Souri: [ example of multiple columns emiting the same property, implying a common domain ]
16:42:49 <ericP> cygri: we're chartered to map from DBs to RDF graphs
16:42:50 <ericP> ... why should we introduce a restriction on the types of generated rdf graphs
16:43:33 <juansequeda> souri: if C1 is domain for foaf:name and C2 is also domain for foaf:name, then the actual domain is the intersection of C1 and C2, whihc is false
16:44:01 <juansequeda> Richard: why is InverseExpr is needed and how would you use it?
16:44:25 <juansequeda> souri: good question but I don't have an example yet on the wiki
16:45:58 <juansequeda> ... suppose in your view you are projecting a column whose column is X+Y but you are projecting it as Y. For Y I'm getting a value of 10. When I translate the SPARQL to SQL, I can do Y = 10. However there is no index on Y. I want to say X = 9. We want the user to specify Y-1 as the InverseExpr
16:50:57 <Ashok> souri discusses example in above Wiki -- URL above
16:51:12 <ericP> ericP: in RIF, you express rule details which don't change the semantics as *annotations*
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16:52:00 <juansequeda> Souri is going through examples in http://www.w3.org/2001/sw/rdb2rdf/wiki/Revised_Example_of_SQL-Query_based_Approach
16:52:03 <Ashok> Annotations that help performance is a good idea
16:54:14 <juansequeda> +q to ask are we expecting that the URIs are to be generated in the SQL query with a concat?
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16:58:00 <Ashok> ack juan
16:58:00 <Zakim> juansequeda, you wanted to ask are we expecting that the URIs are to be generated in the SQL query with a concat?
16:58:50 <juansequeda> Richard: we should have URI Patterns so they can be reused
16:59:28 <juansequeda> Ashok: lets continue next week and talk about class type, uri generation 
16:59:38 <juansequeda> ... and we should think about if this should be an output of the WG
17:00:21 <juansequeda> ... Richard, you had an action to comment on this
17:01:05 <juansequeda> Richard: I will send an email that summarizes limitations or the need of expressivity 
17:01:33 <Zakim> -seema
17:01:34 <Zakim> -Souri
17:01:34 <Zakim> -Ashok_Malhotra
17:01:35 <Zakim> -whalb
17:01:35 <Zakim> -MacTed
17:01:37 <Zakim> -juansequeda
17:01:37 <Zakim> -cygri
17:01:45 <Ashok> rrsagent, make logs public
17:01:55 <Ashok> rrsagent, draft minutes
17:01:55 <RRSAgent> I have made the request to generate http://www.w3.org/2010/08/03-rdb2rdf-minutes.html Ashok
17:02:24 <Zakim> -EricP
17:02:25 <Zakim> SW_RDB2RDF()12:00PM has ended
17:02:27 <Zakim> Attendees were juansequeda, Ashok_Malhotra, +43.316.876.aaaa, whalb, cygri, boris, Souri, EricP, seema, MacTed
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