WebDAV is a fairly portable file (or "resource") transfer and remote directory listing etc. protocol over HTTP designed such that it doesn't conflict with regul

WebDAV is a fairly portable file (or "resource") transfer and remote directory listing etc. protocol over HTTP designed such that it doesn't conflict with regular HTTP operations (GET, POST) send from browsers and implemented by traditional web servers to replace late-1990s FTP-based site maintenance practices by a webserver-integrated facility. It uses HTTP PUT operations (not normally send from browsers unless using JavaScript) and introduces WebDAV-only HTTP verbs (COPY, LOCK, MKCOL, PROPFIND, etc.). It uses XML payloads for representing directory listings and arbitrary file metadata attributes. In the context of this thread, the add-on protocol CalDAV is meant, which specializes the "resource" concept to calendars and scheduling events. There's also a much more elaborate XML-leaning protocol for messaging called XMPP.