Results 4 issues of Veljko Terzic

#### Issue type: - :bug: Bug ____ #### Description: `queryEngine.resultToString()` throws error when querying GraphDB solely. Once you add additional source, everything works as expected. Reproducible code example: https://gist.github.com/vterzic/66d2718fec73f4e842731380533b1ce1 ____...

bug 🐛

# Description Adds implementation for local querying. ## Type of change Please delete options that are not relevant. - [ ] New feature (non-breaking change which adds functionality)

Are there any plans for making this library compatible with the new version of the standard? Thank you for your work.