Set regular pages regarding XML sitemap

[Total-Reality]

Regarding this issue:
#501

@leofeyer wrote

We want to distinguish between "XML sitemap" and "HTML sitemap" in the future, so we need to adjust the following

Sorry if sth. is wrong, this is my first Contao pull request. This is a first suggestion.

Explanation

• Nearly the same settings like the settings of the HTML sitemap, but this setting is only for regular pages
• map_default = no changes in sitemap.xml
• map_always = it always show this page in the sitemap.xml - independent from the robot settings noindex,nofollow
• map_never = page won't be added to sitemap.xml

Current problems of this PR

• We need to change the tl_class of the backend fields below or the position in the palette has to be changed - I think it would be nice to show both sidemap settings side by side, however it is a problem that the XML sitemap field is only visible in the regular page type
• The new Backend labels are only available in en and de currently

[ausi]

we want to keep URLs to noindex,follow pages in the XML sitemap.

With this pull request, noindex,follow pages would get removed from the XML sitemap in some cases, so it is against what we have discussed.

[Total-Reality]

we want to keep URLs to noindex,follow pages in the XML sitemap.

With this pull request, noindex,follow pages would get removed from the XML sitemap in some cases, so it is against what we have discussed.

How do you mean this? A page with noindex,follow will be removed from the XML sitemap only if you set the new XML sitemap setting to map_never. So I don't understand the problem?

[asaage]

With this i think you would be able to have a site index,follow+map_never and it would be in sitemap.xml.
That's ridiculous isn't it?
If the goal is to have no warnings or errors in google - google simply should get a different sitemap without ambiguous options in the page.

[Total-Reality]

With this i think you would be able to have a site index,follow+map_never and it would be in sitemap.xml. That's ridiculous isn't it? If the goal is to have no warnings or errors in google - google simply should get a different sitemap without ambiguous options in the page.

That is not true. If you set index,follow+map_never -> this site won't be in the XML sitemap. I tested this already...

[asaage]

yep your probably right.
I allways struggle to resolve ( X && Y || Z ) the right way without plenty of ( and ) 🤦‍♂️

[leofeyer]

You can use the contao.sitemap event to modify the XML according to your wishes, so there is no need to add another field to the core. We would only do this if there was no other way to accomplish it or if the majority of users would need it. Both is not the case IMHO.