Requirements diagram


Where can I find a detailed tutorial for creating requirement diagrams? 'Cause in the VPGallery, with respecto to Requirements Capturing, I can only find information about Textual Analysis and CRC card. I need to know what is the mining of every possible relation between requirements, and when they can be used. By the way, what notation that diagram is? UML or SySML?

Thanks in advance.
Best regards.