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Container Resources and Reified statement - which is the correct parser out there?

From: Ayalew Kassahun <A.Kassahun@InfoRay.NL>
Date: Wed, 10 Jan 2001 18:34:11 +0100
Message-ID: <7FAFD1931B62D411B2890050BAB19FB13379FB@ms1.inforay.nl>
To: www-rdf-interest@w3.org
Hi,
 
There is already a lot of disscussion going on this topic, but this is just
a practical problem. If it has been answered before please point me to that.
 
I am trying to use RDF in my app and and I come accross a problem concerning
container resources. I tested an RDF data on three parsers available on the
web and all three gave different triples for container (statments with
bagID) . Some of the differences I could explain but some others not.
 
I took the RDF (shown below and taken from CARA[1] - E9) and run it on
Redland[2], CARA and SiRPAC[3]. The results are shown further down. Can
someone explain to me which is the most correct? Namely: 
 
1 - I do not understand why Redland 'reifies' statement with ID 'res1'?!
2 - I do not understand why Redland and CARA 'reify' statement stat3. This
seems to me wrong.?! 
3 - SiRPAC seems to be inconsistent here - stat1 is reified and but not
stat2
 
Regards,
Ayalew
 
 
[RDF]
1:  <?xml version="1.0" ?>
2:  <rdf:RDF xmlns="  <http://myNS.org> http://myNS.org#"
3:      xmlns:rdf="  <http://www.w3.org/1999/02/22-rdf-syntax-ns>
http://www.w3.org/1999/02/22-rdf-syntax-ns#">
4:  <typedNode rdf:ID="res1" rdf:bagID="stat_bag1">
5:    <prop1 rdf:ID="stat1">
6:      <rdf:Description rdf:ID="res2" rdf:bagID="stat_bag2">
7:        <prop2 rdf:ID="stat2">a value</prop2>
8:      </rdf:Description> 
9:    </prop1>
10: </typedNode>
11: <rdf:Description rdf:ID="res3">
12:   <prop3 rdf:ID="stat3">another value</prop3>
13: </rdf:Description>
14: </rdf:RDF>


[Redland]
1: (file#res1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://myNS.org#typedNode> http://myNS.org#typedNode)
2: (file#stat_bag1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag)
3: (file#stat_bag1, [1], file#1)
4: (anon: file#1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)???
5:  (anon: file#1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, file#res1)
6:  (anon: file#1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type)
7:  (anon: file#1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object,
<http://myNS.org#typedNode> http://myNS.org#typedNode)
8:  (file#res1,  <http://myNS.org#prop1> http://myNS.org#prop1, file#res2)
9:  (file#stat_bag1, [2], stat1)
10: (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)
11: (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, file#res1)
12: (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://myNS.org#prop1> http://myNS.org#prop1)
13: (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object, file#res2)
14: (file#res2,  <http://myNS.org#prop2> http://myNS.org#prop2, "a value")
15: (file#stat_bag2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag)
16: (file#stat_bag2, [1], stat2)
17: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)
18: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, file#res2)
19: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://myNS.org#prop2> http://myNS.org#prop2)
20: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object, "a value")
21: (file#res3,  <http://myNS.org#prop3> http://myNS.org#prop3, "another
value")
22: (stat3,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)
23: (stat3,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, file#res3)
24: (stat3,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://myNS.org#prop3> http://myNS.org#prop3)
25: (stat3,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object, "another value")

[CARA]
1:  (online:#res1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://myNS.org#typedNode> http://myNS.org#typedNode)
2:  (online:#stat_bag1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag)
3:  (online:#stat_bag1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1>
http://www.w3.org/1999/02/22-rdf-syntax-ns#_1, stat1)
4:  (online:#res1,  <http://myNS.org#prop1> http://myNS.org#prop1,
online:#res2)
5:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)
6:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, online:#res1)
7:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://myNS.org#prop1> http://myNS.org#prop1)
8:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object, online:#res2)
9:  (online:#res2,  <http://myNS.org#prop2> http://myNS.org#prop2, "a
value")
10: (online:#stat_bag2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag)
11: (online:#stat_bag2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1>
http://www.w3.org/1999/02/22-rdf-syntax-ns#_1, stat2)
12: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)
13: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, online:#res2)
14: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://myNS.org#prop2> http://myNS.org#prop2)
15: (stat2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object, "a value")
16: (online:#res3,  <http://myNS.org#prop3> http://myNS.org#prop3, "another
value")
17: (stat3,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)
18: (stat3  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, online:#res3)
19: (stat3,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://myNS.org#prop3> http://myNS.org#prop3)
20: (stat3,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object, "another value") 

[SiRPAC]
1:  (res1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://myNS.org#typedNode> http://myNS.org#typedNode)
2:  (stat_bag1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag)
3:  (stat_bag1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1>
http://www.w3.org/1999/02/22-rdf-syntax-ns#_1, stat1)
4:  (res1,  <http://myNS.org#prop1> http://myNS.org#prop1, res2)
5:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement)
6:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject, res1)
7:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate,
<http://myNS.org#prop1> http://myNS.org#prop1)
8:  (stat1,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#object>
http://www.w3.org/1999/02/22-rdf-syntax-ns#object, res2)
9:  (res2,  <http://myNS.org#prop2> http://myNS.org#prop2, "a value")
10: (stat_bag2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag>
http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag).
11: (stat_bag2,  <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1>
http://www.w3.org/1999/02/22-rdf-syntax-ns#_1, stat2)
12: (res3,  <http://myNS.org#prop3> http://myNS.org#prop3, "another value").
 
 
[1]    http://zoe.mathematik.uni-osnabrueck.de/RDF/parser.html
<http://zoe.mathematik.uni-osnabrueck.de/RDF/parser.html> 
[2]    http://www.redland.opensource.ac.uk/
<http://www.redland.opensource.ac.uk/> 
[3]    http://www.w3.org/RDF/Implementations/SiRPAC/
<http://www.w3.org/RDF/Implementations/SiRPAC/> 
Received on Wednesday, 10 January 2001 12:22:24 GMT

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