T205459: Decide how SlotRoleHandlers can provide placeholders for missing slots

Phabricator Link	T205459
Status	open
Priority	normal (orange)
Author	[1]
Owner	daniel (Daniel Kinzler)
Projects	Patch-For-Review Multi-Content-Revisions (New Features) Wikidata (in progress) CPT Initiatives (MCR) Structured Data Engineering (Monitoring) Structured-Data-Backlog (Tracking)
Subtasks	T194046: Introduce SlotRoleHandler and SlotRoleRegistry for declaring slot roles., T211726: Collect requirements for slot based layout
Parent Tasks	T209878: Allow control of page layout of multiple slots during rendering
Tags

Related Gerrit Changes:

Change	Subject	Status	Owner	Created	Last Modified	Project
463076	MCR EXP Introduce placeholder output and PageTypeHandler.	NEW	Daniel Kinzler	26 Sep 2018	02 Oct 2018	mediawiki/core
[2]		NOT_READY	Could not get URL https://gerrit.wikimedia.org/r/accounts//detail after 3 tries.Daniel Kinzler	31 Mar 2023	31 Mar 2023
[3]		REJECT	Could not get URL https://gerrit.wikimedia.org/r/accounts//detail after 3 tries.Daniel Kinzler	31 Mar 2023	31 Mar 2023
[4]		NEED	Could not get URL https://gerrit.wikimedia.org/r/accounts//detail after 3 tries.Daniel Kinzler	31 Mar 2023	31 Mar 2023