pwmd
Serves XML element content over a UDS or TLS.
...An element may also contain a "target "attribute that resolves to another element path in the XML document similar to a symbolic link in a filesystem.
Pwmd also supports multiple connections to the same data file (with locking), obtaining a passphrase when needed via a pinentry program or key file, gpg-agent support as well as smartcards, caching options and more.