+
+#### Hiera example
+<pre>
+apt::sources:
+ 'debian_unstable':
+ location: 'http://debian.mirror.iweb.ca/debian/'
+ release: 'unstable'
+ repos: 'main contrib non-free'
+ required_packages: 'debian-keyring debian-archive-keyring'
+ key: '55BE302B'
+ key_server: 'subkeys.pgp.net'
+ pin: '-10'
+ include_src: 'true'
+
+ 'puppetlabs':
+ location: 'http://apt.puppetlabs.com'
+ repos: 'main'
+ key: '4BD6EC30'
+ key_server: 'pgp.mit.edu'
+</pre>
+