Figured it out. in JSON:
{"id" : "book1", "author" : {"set":"Neal Stephenson"} } in XML: <add><doc><field name="id">book1</field><field name="author" set="Neal Stephenson"></field> This seems to work. Jim -- View this message in context: http://lucene.472066.n3.nabble.com/How-to-post-atomic-updates-using-xml-tp4007323p4007325.html Sent from the Solr - User mailing list archive at Nabble.com.