Google Sitemaps using OAI-PMH

OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting)

Google [Sitemaps] accepts the OAI-PMH version 2.0 protocol. You can't use this format for Mobile Sitemaps. If you use this format for your site, simply add  the baseURL of your OAI repository (for instance, http://www.example.com/oaiserver). When we query the baseURL, we automatically  add query parameters (such as ?verb=Identify or ?verb=ListRecords) , so you can simply add the baseURL itself. When we extract the URLs for your site, we expect the records in the repository to be formatted using Dublin Core, with the URLs embedded in <dc:identifier> tags.

from https://www.google.com/webmasters/sitemaps/docs/en/other.html#oai