This page (revision-59) was last changed on 13-Jun-2014 18:25 by Albrecht Striffler

This page was created on 26-Oct-2012 10:15 by Joachim Baumeister

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59 13-Jun-2014 18:25 7 KB Albrecht Striffler to previous
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At line 29 changed one line
A condition can look like ''temperature > 38'' or ''weather = rain''. Such simple conditions can be combined to more complex ones, using the following syntax:
A condition can look like ''"temperature > 38"'' or ''"weather = rain'"'. Such simple conditions can be combined to more complex ones, using the following syntax:
At line 39 changed one line
In a rule action we can set other questions or variables. Examples could be ''Show warning = Yes'' or ''umbrella = Yes''\\
In a rule action we can set other questions or variables. Examples could be ''"Show warning = Yes"'' or ''"umbrella = Yes"''\\
At line 67 changed one line
!!ELSE and UNKNOWN Actions
!!ELSE Actions
At line 69 changed one line
Using such rules, we often not only want something to happen if the condition is true (e.g. temperature <= 0), but also when the condition is false. We can of course always do this, by writing a second rule, using the negated condition of the first rule (temperature > 0). With d3web KnowWE, we provide the possibility, to just use the keyword ELSE, similar to how it is known and done in software engineering.
Using such rules, we often not only want something to happen if the condition is true (e.g. ''temperature <= 0''), but also when the condition is false. We can of course always do this, by writing a second rule, using the negated condition of the first rule (e.g. ''temperature > 0''). With d3web/KnowWE, we provide the possibility, to just use the keyword ELSE, similar to how it is known and done in software engineering.
At line 77 added 16 lines
!!UNKNOWN Action
In d3web/KnowWE, every question can, besides their normal values, also have the value ''Unknown''. This means, that the value of the question is currently actually unknown or unknowable (which is different from not answering the question).\\
If a rule uses a question which currently has the value ''Unknown'' will result in the rule not being evaluated and therefor the action will not fire.
__Example:__ Lets assume, the temperature is currently unknown, because the sensor is broken. In this case, we really do not know whether the roads are icy or not. So to expand on the example above, we can do the following:
{{{
IF temperature < 0
THEN icy roads = Yes
ELSE icy roads = No
UNKNOWN icy roads = No
}}}
This way, if the temperature is ''Unknown'', we also set the variable/question ''icy roads'' to ''Unknown'', without having the write rules for each of the actions.
This page (revision-59) was last changed on 13-Jun-2014 18:25 by Albrecht Striffler Top