OpenStreetMap

You seem to have deleted "opening_hours:holydays" from http://www.openstreetmap.org/node/3314274507/history , was that deliberate?

Yes. Have added "real" syntax to the opening_hours-key,

see: https://wiki.openstreetmap.org/wiki/Key:opening_hours#Syntax for that

Thanks, but how to capture the information that on holydays the opening hours are different?

the information is in the opening_hours-key
You can capture for SH or PH.

sry, my english is not the best, maybe i don't understand or misunderstand the question? There is no documented key "opening_hours:holidays"

It doesn't matter whether there's a documented key (yet) or not - information is still useful to a human looking at the object and shouldn't have been deleted. You could argue that the tag should have been different, and perhaps it might have made sense to clarify with the original mapper what they meant, but there's no reason just to delete the information (about holy day opening).

I _don't_ have _deleted_ any information!
Don't understand your problem, will go now to the forum for help translating your messages and discussing about.

SomeoneElse, in the particular example you mentioned, the user has transferred data from the "holydays" tag into the opening_hours tag manually with no (apparent) loss of information?

Have a look at the opening_hours syntax please. I don't think the current value covers what the original editor meant.
I think the correct syntax should be
Mo,Th 17:00-20:00; Tu,Fr 09:00-11:00,14:00-17:30; We 14:00-17:30; Sa 10:00-12:00; SH Mo,Tu,We,Fr off
You can use http://openingh.openstreetmap.de/evaluation_tool/ to validate (choose your country and a day which is in the school holidays to check the SH values.)
Schau dir den Syntax für opening_hours nochmal an. So ist das nicht so, wie es der Original-Mapper ursprünglich gemeint hatte. Benutze http://openingh.openstreetmap.de/evaluation_tool/ um deinen Wert zu überprüfen.

Oha. Endlich ein Argument was ich verstehe...
Denkfehler meinerseits, bin davon ausgegangen, dass PH/SH off implizit wäre. Ich korrigier das changeset mal jetzt.

Allerdings: heisst das im Umkehrschluss auch, dass meiner Einschätzung nach gut die Hälfte aller opening_hours dahingehend falsch sein müssten, weil PH off so gut wie nie getaggt ist.

Ääh, der Thread im Forum ist hier: http://forum.openstreetmap.org/viewtopic.php?id=30396
Diskutiert sich besser.

I have reverted most of the objects to the totally wrong version before.