[gravitas]

> Browser bookmarks are actually not the same as the bookmarks I keep in LinkAce

You are not alone, I currently use Diigo with the same needs; the Diigo bookmark list is massive, unwieldy, goes back decades - the in-browser bookmarks are slimmmed down to just what I use commonly. What we really need is a new RFC "LinkDav" which follows in the footsteps of CardDav, CalDav and WebDav to round out our data portability lives. Want to try your hand at writing a RFC? :-)

On the Import docs section it just says "...in the HTML format" - there's a Chrome, Firefox and IE version of HTML Export from Diigo, it would be helpful to understand which one would be the best for import to LinkAce: https://www.diigo.com/tools/export

[rakoo]

There is a standard already, called OPML that is already used in every RSS reader to store a list of feeds. Being XML behind, I'm sure it can be adapted to contain everything related to a bookmarking service; it's not a complete format like CalDAV and friends, but it looks like a solid base to build on.

[gravitas]

OPML (I am familiar) could be used as a basis yep, but it's a file format which is more akin to vCard, vCal and iCal - CalDav, CardDav and WebDav are the transport(?) layers (API layers, operational layers, call them what you will) which sit on top of the file format standards providing the interoperability.