lib/xommelier/schemas/syndication/creativeCommons.xsd
<xs:schema
targetNamespace="http://backend.userland.com/creativeCommonsRssModule"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="license" type="xs:anyURI">
<xs:annotation>
<xs:documentation>
<![CDATA[One element is defined.
license -- if present as a sub-element of <channel>, indicates that the content of the RSS file is available under a license, indicated by a URL, which is the value of the license element. A list of some licenses that may be used in this context is on the Creative Commons website on this page, however the <license> element may point to licenses not authored by Creative Commons.
You may also use the <license> element as a sub-element of <item>. When used this way it applies only to the content of that item. If an item has a license, and the channel does too, the license on the item applies, i.e. the inner license overrides the outer one.
Multiple <license> elements are allowed, in either context, indicating that the content is available under multiple licenses.]]>
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:schema>