Waramu is an open source Estonian learning object repository (LOR) that stores 3000 K-12 learning object metadata records. It provides a publishing interface for managing metadata, learning objects, and user sessions through SOAP web services. The interface supports methods for creating, updating, searching, and deleting metadata records and attachments. Sample requests and responses are provided to illustrate typical interactions with the publishing interface. Future plans include implementing new methods for access control and interoperability with other systems.