I'm trying to build the extraction_framework project but running into a few 
issues.

When i tried to build using maven 3.0.3, i got a warning and a error:
[WARNING] 'build.plugins.plugin.version' for 
org.apache.maven.plugins:maven-compiler-plugin is missing. @ 
org.dbpedia.extraction:main:2.0-SNAPSHOT, 
/Users/tcc/src/scala/dbpedia_extraction_framework/pom.xml, line 73, column 21
[WARNING] 'build.plugins.plugin.version' for 
org.apache.maven.plugins:maven-surefire-plugin is missing. @ 
org.dbpedia.extraction:main:2.0-SNAPSHOT, 
/Users/tcc/src/scala/dbpedia_extraction_framework/pom.xml, line 81, column 21

[ERROR] Failed to execute goal on project core: Could not resolve dependencies 
for project org.dbpedia.extraction:core:jar:2.0-SNAPSHOT: The following 
artifacts could not be resolved: org.json:json:jar:1.1, 
org.openrdf:openrdf:jar:1.0: Failure to find org.json:json:jar:1.1 in 
http://download.java.net/maven/2/ was cached in the local repository, 
resolution will not be reattempted until the update interval of 
maven2-repository.dev.java.net has elapsed or updates are forced -> [Help 1]

Investigating the error, I noticed that the json and rdf are referring to 
packages which are not in public repos?
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>1.1</version>
<type>jar</type>
</dependency>

<dependency>
<groupId>org.openrdf</groupId>
<artifactId>openrdf</artifactId>
<version>1.0</version>
</dependency>

The closest json lib i found was one version 20090211 
(http://mvnrepository.com/artifact/org.json/json/20090211) instead of 1.1: 
http://mvnrepository.com/artifact/org.json/json/20090211

I couldn't find a openrdf artifact, i did only notice these ones, none of which 
are named just openrdf.
http://mvnrepository.com/artifact/org.openrdf

Which repo should I add to successfully build the extraction_framework?

Thanks for helping me get started with developing with dbpedia!
-- 
Tommy Chheng
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