g.txt

# install_wiki.yml
---
[... other installation stuff, including templates ...]
# The templates etc. use up to 10 different configuration options for
# each wiki. The following only uses the "name" attribute, but it's
# the most complicated one as it involves another with_items loop.

- name: wiki | Install mediawiki files for {{wiki.name}}
  file: src=/usr/share/mediawiki/{{item}}
        dest=/srv/emcom/{{wiki.name}}/{{item}}
        state=link
        owner=emcom group=emcom
  with_items:
    - api.php
    - config
    - extensions
    - img_auth.php
    - includes
    - index.php
    - install-utils.inc
    - languages
    - maintenance
    - opensearch_desc.php
    - profileinfo.php
    - redirect.php
    - redirect.phtml
    - skins
    - StartProfiler.php
    - thumb.php
    - trackback.php
    - wiki.phtml

# main.yml

- name: emcom | Install wikis
  include: install_wiki.yml
  with_items:
    - name: foowiki
      dbname: foowiki
      dbuser: foowiki
      sitename: FooWiki
      scriptpath: /wiki
      articlepath: /mediawiki
      required_forum_name: Internal
      logo: http://.../
      server: http://.../
      wikipassword: "{{dbpass.foowiki}}"
    - ... imagine a handful of other wikis here with different
      configuration options ...

# Now, for each iteration, item will be a dictionary with all wiki
# options. I can work around this using something like this:

- name: emcom | Install wikis
  include: install_wiki.yml
           wiki_name="{{item.name}}" ... all 10 variables ...

# Then I need to rename wiki.name to wiki_name in the
# install_wiki.yml, and have some annoying repetition in main.yml.

# I was wondering if there's a better solution, or if I am approaching
# the problem the wrong way around. :-)