**As** an admin
**I want to** configure an external xwiki instance as a wiki integration
**so that** this wiki can be used within projects 

**Acceptance criteria**

* A wiki Begin of the insertionproviderEnd of the insertion Begin of the deletion integrationEnd of the deletion of type XWiki must be creatable, editable and delable.

* The admin must be able to Begin of the insertionset a name for the xwiki instance.

* The admin must be able toEnd of the insertion connect to a wiki on an xwiki instance by URL.

* If the URL is invalid or doesn't point to a valid xwiki instance, a validation error is shown.

* The admin must be able to Begin of the insertionset aEnd of the insertion Begin of the deletion select any subset of eligable wikis from theEnd of the deletion xwiki Begin of the insertioninstance identifier.

* The admin must be able to copy an openproject instance identifierEnd of the insertion Begin of the deletion instance.End of the deletion

* The admin must be able to configure an authentication strategy.

* bidirectional OAuth2

* common OIDC

* OIDC must work with and without token exchange