Remove `ifParam`, `ifValue`, `onlyIfValue`, `unlessValue`, `ifParameter` keep `onlyIfSessionKey` & `unlessSessionKey`

^{Originally posted by **nielsm5** March 9, 2026}
The following attributes determine the flow of application data. Yet it's difficult to see the flow while writing or debugging the application:
- ifParam
- ifValue
- onlyIfValue
- onlyIfSessionKey
- unlessSessionKey
- unlessValue

Hence this discussion, what are potential reasons to keep these attributes?

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Arguments to keep these attributes:
* You require less pipes in your `Configuration.xml`

Counterarguments:
* Not immediately visible in the configuration
* Not immediately visible in Ladybug (you have to click the “i” icon of the pipe configuration)
* Not easy to configure in the FF! Flow
* Not visible in the FF! Console Flow diagrams
* Error-prone: what does “equals” mean? Does something need to have the same content? (Are you then only looking at the message and not the context / file format?)
* XSD becomes clearer
* Functionality is limited (you can do significantly more with the IfPipe and SwitchPipe)