invalid exampl indocumentation

[Grummfy]

http://hoa-project.net/Fr/Literature/Hack/Ruler.html#Serialize_the_object_model

in this example we speak about $ruleId but this is not defined.

[Hywan]

@Grummfy Hello :-),

Yes, this is almost a pseudo-code. Let's suppose $ruleId exists, this is not important to understand the algorithm. This is an uninstanciated variable.