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- name
The name of the dynamic variable used to refer to it. - checkonce:= "true" | "false" (optional, defaults to "false")
Mark the dynamic variable to be evaluated just once, either when the installation starts or as soon as an optional condition gets true. This makes it behave like a normal variable, although with enhanced capabilities to gather a value.
Values gathered by a dynamic variable definition with checkonce="true" can be overridden, if there is another dynamic variable with the same key (and different conditions ) defined, which gets true later. - ignorefailure:= "true" | "false" (optional, defaults to "true")
Might be used to allow the installation to continue or abort if an error occurred during gathering the value for a certain dynamic variable. - condition (optional)
The assignment of a dynamic variable itself can be made dependent on a certain condition, using the condition attribute, which refers to the ID of condition defined in the installer description elsewhere. - unset:= "true" | "false" (optional, defaults to "true") (optional)
By defaut, if none of the conditions of a dynamic variable of one and the same name isn't met, a dynamic variable is unset for cleanup purposes.
Setting unset false prevents unsetting a variable if the complex condition above is not met and leaves the variable value unchanged for that definition.
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