XAL is the acronym of XML Automata Language. It is a language which allows to create web oriented and common application starting from the automaton definition. The application is defined as a states collection and a transitions set between these states: a transition is perfomed when a particular event arises.

XAL allows to define temporal constraints that have to be statisfied in order that specific transitions can be perfomed properly.

Each state has two functions associated: an action one and a metric one. These function can be PHP functions or class method or web services calls.