What the Hell is That in My XmlDocument Tag?

So using the SharePoint Solution generator, if you attempt to reverse engineer a list containing a content type, you may see something strange in the XMLDocuments section (scroll right):

<XmlDocuments>
  <XmlDocument NamespaceURI="http://schemas.microsoft.com/sharepoint/v3/contenttype/forms">
        PEZvcm1UZW1wbGF0ZXMgeG1sbnM9Imh0dHA6Ly9zY2hlbWFzLm1pY3Jvc29mdC5jb20vc2hhcmVwb2ludC92My9jb250ZW50dHlwZS9mb3JtcyI+PERpc3BsYXk+RG9jdW1lbnRMaWJyYXJ5Rm9ybTwvRGlzcGxheT48RWRpdD5Eb2N1bWVudExpYnJhcnlGb3JtPC9FZGl0PjxOZXc+RG9jdW1lbnRMaWJyYXJ5Rm9ybTwvTmV3PjwvRm9ybVRlbXBsYXRlcz4=
  </XmlDocument>
</XmlDocuments>

 

Turns out that this is just the Base64 encoded version of the more common

<FormTemplates xmlns="http://schemas.microsoft.com/sharepoint/v3/contenttype/forms">
  <Display>DocumentLibraryForm</Display>
  <Edit>DocumentLibraryForm</Edit>
  <New>DocumentLibraryForm</New>
</FormTemplates>