MetaWeblog is one of the API supported by b2evolution.

Supported methods as of b2evolution version 2.4:

• metaWeblog.newMediaObject
• metaWeblog.newPost
• metaWeblog.editPost
• metaWeblog.getPost
• metaWeblog.getCategories
• metaWeblog.getRecentPosts

More info about this API: http://www.xmlrpc.com/metaWeblogApi