OpenCalais Parse RDF in .NET
Is there a way to parse OpenCalais RDF in .NET since I am using dotnetRDF and it keeps giving me errors. A sample of the generated Rdf can be found at http://viewer.opencalais.com/ , I am really very lost and will greatly appreciate any help! help if you are using any other apis or know how to get it to work with dotnetRDF as i am really really lost
Erika
<!--Use of the Calais Web Service is governed by the Terms of Service located at http://www.opencalais.com. By using this service or the results of the service you agree to these terms of service.--><!--Relations: PersonEmailAddress
EmailAddress: jack@ctu.net, r.good@testings.com
Person: Jack Bauer, Rose Goodings--><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:c="http://s.opencalais.com/1/pred/"><rdf:Description c:allowDistribution="true" c:allowSearch="true" c:calaisRequestID="5e2f7759-55cb-ac2f-1281-b19ee8118cd9" c:externalID="calaisbridge" c:id="http://id.opencalais.com/KQGwCnWZBLPTHadX7uDMfA" rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/DocInfo"/><c:document><![CDATA[Jack Bauer <jack@ctu.net>
Rose Goodings <r.good@testings.com>]]></c:document><c:docTitle/><c:docDate>2010-04-20 07:03:23.998</c:docDate><c:externalMetadata c:caller="calaisbridge"/><c:submitter>calaisbridge</c:submitter></rdf:Description><rdf:Description c:contentType="text/raw" c:emVer="7.1.1103.5" c:langIdVer="DefaultLangId" c:language="InputTextTooShort" c:processingVer="CalaisJob01" c:submissionDate="2010-04-20 07:03:23.905" rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/meta"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/DocInfoMeta"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:submitterCode>416dcd8a-766f-0aa3-d94c-e5034b6ffc98</c:submitterCode><c:signature>digestalg-1|Kjq/y7thehi10hbBQ5v42YxE8n0=|a2DMjGG4mKEGTlIvvCvOg+BG1sCDrMZFSfRBjOBXMHwGtfLknC1nAQ==</c:signature></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/lid/DefaultLangId"><rdf:type rdf:resource="http://s.opencalais.com/1/type/lid/DefaultLangId"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:lang rdf:resource="http://d.opencalais.com/lid/DefaultLangId/InputTextTooShort"/></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/pershash-1/a3100b92-7d3d-3f63-afcb-265678c15dcc"><rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Person"/><c:name>Jack Bauer</c:name><c:persontype>N/A</c:persontype><c:nationality>N/A</c:nationality><c:commonname>Jack Bauer</c:commonname></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Instance/1"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/pershash-1/a3100b92-7d3d-3f63-afcb-265678c15dcc"/><!--Person: Jack Bauer; --><c:detection>[]Jack Bauer[ <jack@ctu.net>
Rose Goodings]</c:detection><c:prefix/><c:exact>Jack Bauer</c:exact><c:suffix> <jack@ctu.net>
Rose Goodings</c:suffix><c:offset>0</c:offset><c:length>10</c:length></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Relevance/1"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/RelevanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/pershash-1/a3100b92-7d3d-3f63-afcb-265678c15dcc"/><c:relevance>0.643</c:relevance></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/b323806b-4832-375a-aec8-56343d47e2d2"><rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/EmailAddress"/><c:name>r.good@testings.com</c:name></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Instance/2"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/b323806b-4832-375a-aec8-56343d47e2d2"/><!--EmailAddress: r.good@testings.com; --><c:detection>[Bauer <jack@ctu.net>
Rose Goodings <]r.good@testings.com[>]</c:detection><c:prefix>Bauer <jack@ctu.net>
Rose Goodings <</c:prefix><c:exact>r.good@testings.com</c:exact><c:suffix>></c:suffix><c:offset>41</c:offset><c:length>19</c:length></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Relevance/2"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/RelevanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/b323806b-4832-375a-aec8-56343d47e2d2"/><c:relevance>0.643</c:relevance></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/addbee66-556c-3a3a-b2d4-4c4c1e668261"><rdf:type rdf:resource="http://s.opencalais.com/1/type/em/r/PersonEmailAddress"/><!--Rose Goodings--><c:person rdf:resource="http://d.opencalais.com/pershash-1/9f7b3610-9b76-34d4-8eea-3c2c0acbb31b"/><!--r.good@testings.com--><c:emailaddress rdf:resource="http://d.opencalais.com/genericHasher-1/b323806b-4832-375a-aec8-56343d47e2d2"/></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Instance/3"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/addbee66-556c-3a3a-b2d4-4c4c1e668261"/><!--PersonEmailAddress: person: Rose Goodings; emailaddress: r.good@testings.com; --><c:detection>[Bauer <jack@ctu.net>
]Rose Goodings <r.good@testings.com[>]</c:detection><c:prefix>Bauer <jack@ctu.net>
</c:prefix><c:exact>Rose Goodings <r.good@testings.com</c:exact><c:suffix>></c:suffix><c:offset>26</c:offset><c:length>34</c:length></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/pershash-1/9f7b3610-9b76-34d4-8eea-3c2c0acbb31b"><rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Person"/><c:name>Rose Goodings</c:name><c:persontype>N/A</c:persontype><c:nationality>N/A</c:nationality><c:commonname>Rose Goodings</c:commonname></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Instance/4"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/pershash-1/9f7b3610-9b76-34d4-8eea-3c2c0acbb31b"/><!--Person: Rose Goodings; --><c:detection>[Bauer <jack@ctu.net>
]Rose Goodings[ <r.good@testings.com>]</c:detection><c:prefix>Bauer <jack@ctu.net>
</c:prefix><c:exact>Rose Goodings</c:exact><c:suffix> <r.good@testings.com></c:suffix><c:offset>26</c:offset><c:length>13</c:length></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Relevance/3"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/RelevanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/pershash-1/9f7b3610-9b76-34d4-8eea-3c2c0acbb31b"/><c:relevance>0.643</c:relevance></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/8c80538c-84d5-3394-a452-81a59a5eb11a"><rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/EmailAddress"/><c:name>jack@ctu.net</c:name></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Instance/5"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/8c80538c-84d5-3394-a452-81a59a5eb11a"/><!--EmailAddress: jack@ctu.net; --><c:detection>[Jack Bauer <]jack@ctu.net[>
Rose Goodings <r.good@testings.com>]</c:detection><c:prefix>Jack Bauer <</c:prefix><c:exact>jack@ctu.net</c:exact><c:suffix>>
Rose Goodings <r.good@testings.com></c:suffix><c:offset>12</c:offset><c:length>12</c:length></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Relevance/4"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/RelevanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/8c80538c-84d5-3394-a452-81a59a5eb11a"/><c:relevance>0.643</c:relevance></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/a7bd9537-999f-3821-8858-c57f10ecd18d"><rdf:type rdf:resource="http://s.opencalais.com/1/type/em/r/PersonEmailAddress"/><!--Jack Bauer--><c:person rdf:resource="http://d.opencalais.com/pershash-1/a3100b92-7d3d-3f63-afcb-265678c15dcc"/><!--jack@ctu.net--><c:emailaddress rdf:resource="http://d.opencalais.com/genericHasher-1/8c80538c-84d5-3394-a452-81a59a5eb11a"/></rdf:Description><rdf:Description rdf:about="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902/Instance/6"><rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/><c:docId rdf:resource="http://d.opencalais.com/dochash-1/e7b46664-fa0c-3da1-88f9-cb79fe0d6902"/><c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/a7bd9537-999f-3821-8858-c57f10ecd18d"/><!--PersonEmailAddress: person: Jack Bauer; emailaddress: jack@ctu.net; --><c:detection>[]Jack Bauer <jack@ctu.net[>
Rose Goodings <r.good@testings.com>]</c:detection><c:prefix/><c:exact>Jack Bauer <jack@ctu.net</c:exact><c:suffix>>
Rose Goodings <r.good@testings.com></c:suffix><c:offset>0</c:offset><c:length>24</c:length></rdf:Description></rdf:RDF>
I also have the following (where the file contains the above text):
System.IO.StreamReader tr = new System.IO.StreamReader("C:/test.txt");
string s = tr.ReadToEnd();
Graph g = new Graph();
FileLoader.Load(g, "C:/test.txt");
and I am getting the following RDFParseException
StringParser was unable to parse the RDF string correctly, StringParser auto-detection guessed "NTriples", but it could not be parsed. The RDF string might be wrong or StringParser might guess wrong
I'm really lost, please help
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1 answer
Correctly, the error was related to the RDF / XML parser which did not handle CDATA elements correctly in some situations, this should now be fixed and I have uploaded new library assemblies with this bug fix for both dotnetrdf.org and SourceForge
If you download it again and try on RDF from OpenCalais it should work fine now (hopefully)
I try to fix bugs as quickly as possible and support my users, so if you have any further issues please let me know on the mailing lists so I can see and resolve your issues as soon as possible:
dotnetrdf-bugs@lists.sourceforge.net dotnetrdf-develop@lists.sourceforge.net
Edit
In your example application, StringParser does not define the data format as there is no declaration <?xml version="1.0"?>
as it expects to see RDF / XML
Try explicitly specifying how to use the parser instead:
FileLoader.Load(g, "C:\test.txt", new RdfXmlParser());
Or alternatively rename the file to test.rdf
, in which case it will guess the data format as RDF / XML from the file extension instead of guessing by reading it in the file and doing some simple regex on the original line
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