Implement the turtle validator library

[sebastienhenau]

The issue

Valid 'Turtle' is important for this validator because the validation library reads the data in Turtle format and then returns errors and warnings concerning the DCAT feed. It does not validate the Turtle. Users can make use of other sites that have this feature.

Implementing this feature requires the use of a library which will show errors if the turtle format is valid or well written. The issue is to find a way to implement this library and make use of the Turtle validator to show errors when the Turtle format is selected or chosen.

The library

The library that can be used for the feature is:
https://github.com/mmlab/TurtleValidator/

[pietercolpaert]

Not urgent... Postpone this to the last issue ;)