As an editor I want to store a Schema I just prepared in order to share it with other editors.
GIVEN the SpecialPage Special:NewSchema
WHEN clicking "Create"
THEN a new Schema entity is created and persisted
AND it is assigned an ID
AND the user is redirected to the new Schema page
 new Schema entities can be created
 new Schema entities go to their own namespace (Schema:)
 new Schema entities are given incrementing unique IDs
 Schema entity page contains the following data: ID, label, description and aliases in the user interface language
 Label, description and alias in the user language are displayed in the header, or "there is no label" when there is no data in the user language
 a new entry is added to Recent changes, watchlist and Schema page history with the text "Created a new Schema: label, description"
 blocked users are not able to create a new Schema
* What's the entity ID format?