The National Electronic Conveyancing System (NECS) is working on standards for buying property online, including lodging land titles. They have been around since 2005, but progress seems to be slow. Most recently there is an agreement with the Lending Industry XML Initiative (LIXI) to use XML standards. However, I wasn't able to find any documentation about actual standards to be used, just on governance and business models.
The UK Land Registry seems to have made some progress, with PISCES, developing standards:, including one for Residential Conveyancing, released 7 April 2006. This includes a User Guide, Business Specification (with Process Map (PMP), Document Exchange Table (DET), Component Model (CMX) and Code Lists (CDL), and Schemas.