Binding Expression Constraint

https://www.w3.org/community/xformsusers/wiki/XForms_2.0#Creating_the_Master_Dependency_Directed_Graph



"Any expression violating any Binding Expression Constraint causes the 
recalculate flag to be cleared and an xforms-compute-error 
<https://www.w3.org/community/xformsusers/wiki/XForms_2.0#evt-computeError> 
 event to be dispatched."


There is no formal definition of "Binding Expression Constraint" despite 
the capital letters.  what do you think?


Steven