Github user ajs6f commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/23
Instead of
```
throw new IllegalArgumentException("Unrecognized node type: " + node);
```
what about
```
throw new ConversionException(new UnsupportedOperationException("Conversion
does not currently support SPARQL variables : " + node));
```
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