gvSIG-Desktop 1.11. User manual
You can give whatever name you want to the different legend values, to see them in the Table of Contents.
In the previous image we saw a legend by a unique Symbol, but it is also possible to give each of the legend values a label name by Interval, unique Value, etc. (or modify it, from each of the text boxes), as well as being able to modify the order with which theses values appear in ToC (throught the up/down arrows):