[UIBound|https://saffron.caret.cam.ac.uk/svn/projects/RSFUtil/trunk/src/uk/org/ponder/rsf/components/UIBound.java]  is the base class for the RSF hierarchy of [primitive components|PrimitiveComponents] which hold a single value, associated with an [EL] path to the model on one side, and a section of the markup indexed by an [rsf:id|IDs] on the other. This bound value is of one of the three RSF [UITypes|UIType].