many differences at #schemaorg workshop, but some common ground to build on: 1. simplicity of mental model is important, 2. rough consensus that we should support multiple syntaxes - co-evolution and sharing of ideas has informed and mutually improved microformats/microdata/RDFa, 3. multiple types on objects are useful/important, 4. everyone wants to innovate as efficiently as they can, so let's openly share and incorporate brainstorm proposals.