However, the registration belongs to the vendor or organization producing the software that employs the type being registered, and that vendor or organization can at any time elect to assert ownership of a registration done by a third party. When viewing a file, these two work together as follows:

The four required properties for every page are:. Types The following types are used when defining attributes in Open Graph protocol.

Dublin Core Many image libraries and a wide variety of industries store information with image files using this schema. A sequence of Unicode characters that identify an Internet resource.