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Any class can provide an oEmbed endpoint by extending the abstract class oEmbedEndpoint, implementing the required members.
The static variable $scheme represents the oEmbed-provider-style scheme format (e.g. http://example.com/*) for a provider.
The static method oEmbedProvider::get_response accepts a url, and optionally accepts an array of options, sourced from the query parameters of the call.
This method must return an instance of a class which extends oEmbedEndpoint_Response.