Hi guys <div><br></div><div>I've been reading Neteler/Mitasova book and I have a question:</div><div>Regarding vector data, what is a category? and Why do I need to have category readers/writters? Because, for What I understood, a category is like a Feature ID that links a geometry to its attributes in a DB. Is this correct?</div>
<div><br></div><div>Thanks and thanks to Luis Lisboa for lending me the GRASS book (for 2 weeks :) )</div><div><br></div><div>Best regards,</div><div>Pedro Roma</div>