Well, like i said before, there is none, until someone very smart figures it out!
As jman0war points to above, providing a systematic means of transferring ownership of anything secured by an individual's private key opens the whole system up to attack. Bitcoin by design deliberately excludes external trust authorities, there is no record of ownership, let alone a means of contacting owners to validate any transfer is legitimate would leave it wide open. Providing a systematic approach would require an overhaul of how bitcoin works that would be strongly resisted.
The FADAA legislation in the US provides a framework for the transfer of digital assets on death, and sets out the level of detail and proof an executor needs to provide in order to take over ownership of these assets, but such a system only works where the current holder of the assets have verified the identity of the original owner. Bitcoin offers relative anonymity, and no such identity verification. Some of the wallet providers will transfer ownership of assets they are holding under the above legislation in certain circumstances, but they will not publicly release details of the mechanism for fear that it will be exploited.
With the current cryptography tools you could split your keys, encrypt them further, store parts in a safe deposit box or a lawyer or whatever you want.
You can keep enough to be able to access the bitcoins yourself, and require every one of the other parts to work together to access them without you.
So you're back to just passing on your private key, which is a very different proposal from a systematic solution implemented in code. There are many existing methods to do just that, each with their own issues. If you go down the key-splitting route, make sure there are fail-safes built-in to your approach, with no one individual the sole holder of one piece of the puzzle. A chain such as that just requires a single failed link to render the key unrecoverable. Even an article on bitcoin.com suggests the best way to bequeath bitcoin is to write down all the information, including your credentials!