Table 1 Use of internal and external state references This example (in pseudocode for sake of compactness) shows the how the notions of receptor and ligand are relative to the current Molecular Page. It also makes use of internal and external links to the various states of the interacting complexes. Note that each interaction is coded twice, although the stateMolecule and stateLigand attributes are reversed. Internal links are in italic, while external links are underlined.

molecularPage name="mol1" 

      listOfStates 

            state identifier="greedy"

            state identifier="neutral"

      ligand name="mol2" stateLigand="active"            

            property name="Kd" stateMolecule="greedy"

                  value mean="10" unit="nanomole per litre"

            property name="Kd" stateMolecule="neutral"

                 value mean="1" unit="micromole per litre"

molecularPage name="mol2" 

      listOfStates 

            state identifier="active"

            state identifier="inactive"

      ligand name="mol1" stateLigand="greedy"

            property name="Kd" stateMolecule="active"

                  value mean="10" unit="nanomole per litre"

      ligand name="mol1" stateLigand="neutral" 

            property name="Kd" stateMolecule="active"                  

                  value mean="1" unit="micromole per litre"