On Tue, Jun 30, 2015 at 1:42 PM, Eduard Moraru <enygma2002(a)gmail.com> wrote:
  Hi,
 Now that we are moving to Nested Documents, there is the question of what
 do we do with the existing space and page templates[1]? How do we (still)
 display them?
 In the new create UI we will be showing just the option to create a Nested
 Document, but for advanced users, we might also show the option to create a
 terminal document (NS-style i.e. document in a space).
 Since a ND translates to a space WebHome in the NS approach (or previous
 approach), we could reuse any existing space templates and display them
 instead of page templates.
 Existing page templates were built with the NS approach in mind and I am
 concerned that, until the app that provides them does not migrate them to
 space templates (i.e. ND-compatible), we risk breaking their functionality
 (?). This might now be valid for page templates manually created by the
 admins that might have no issues since they are content focused and not
 processed by any application.
 Until they are migrated, we could just show page templates only when
 creating terminal documents, as an advanced user.
 So the options I see are:
 1) Show both space and page templates when creating ND and only page
 templates when creating terminal pages, hoping most of them will work most
 of the time.
 2) Show only space templates when creating ND and only page templates when
 creating terminal pages, but risk hiding a lot of useful page templates
 from regular users which would work most of the time.
 My +1 goes to 1). 
+1 for 1) but I think we can ignore / deprecate / remove the
XWiki.TemplateProviderClass_type property and consider all templates
as page templates. As Caty said, "space" template are actually page
templates for the space home page.
Thanks,
Marius