The original Bookmarks specification (Bookmark Storage (XEP-0048) ) used the widely available Private XML Storage (Private XML Storage (XEP-0049) ), but stored all bookmarks in a single element. When the specification was moved to the Standards Track and Draft, it was also updated to use the user's Pubsub service (Best Practices for Persistent Storage of Private Data via Publish-Subscribe (XEP-0223) ), but kept this single element containing all bookmarks inside a single Pubsub item.
Most implementations have kept to the original, Private XML Storage based solution, and while some newer implementations have used Pubsub, these are limited in capability by the use of a single item.
This specification resolves both issues by providing a new Bookmarks specification to migrate to, and takes the opportunity to update the XML namespace in use as well. The URL storage is dropped, since it is rarely used. Storage of URL bookmarks is therefore out of scope.
Clients store each bookmarked chatroom as a Pubsub item within the 'urn:xmpp:bookmarks:0' node. Each item SHALL have, as item id, the Room JID of the chatroom (eg, email@example.com).
The payload of the item SHALL be a conference element qualified by the 'urn:xmpp:bookmarks:0' namespace, with the following syntax:
|Element or Attribute||Definition||Datatype||Inclusion|
|'autojoin' attribute||Whether the client should automatically join the conference room on login.||boolean defaulting to false ||OPTIONAL|
|'name' attribute||A friendly name for the bookmark.||string||RECOMMENDED|
|<nick/> element||The user's preferred roomnick for the chatroom.||string||OPTIONAL|
Note: The datatypes are as defined in XML Schema Part 2 .
This bookmark would be displayed as 'Council of Oberon' and, if activated, would attempt to join the conference room 'firstname.lastname@example.org' with nickname 'Puck'.
Note that a bookmark item MUST contain only one conference room.
Note also that a conference element has no truly mandatory attributes or child elements, thus the following is legal:
A client interested in bookmarks SHOULD include the 'urn:xmpp:bookmarks:0+notify' feature in its Entity Capabilities (XEP-0115) , as per Personal Eventing Protocol (XEP-0163) , so that it receives notifications for updates done by other clients of the user, and react accordingly. The actual notifications are explained in the Bookmark Notifications section of this specification.
Once connected, a client first retrieves the current list of bookmarks. It then SHOULD join every MUC identified by the items’ 'id' attribute that have an 'autojoin' attribute that is set to "true" or "1".
Adding a bookmark means publishing a new item, with the bookmark JID as id, to the 'urn:xmpp:bookmarks:0' node.
publish-options (as defined in XEP-0060) MUST be supported by the server in order to check that the node is correctly configured before publishing a new conference. This is especially important to avoid leaking your bookmarks to your contacts for instance.
Removing a bookmark means retracting an existing item, identified by the bookmark's JID, form the 'urn:xmpp:bookmarks:0' node.
This implies that server support for the "delete-items" pubsub feature is REQUIRED.
A 'notify' attribute SHOULD be included on the <retract/> element in order to inform other online clients of the deletion.
When a client is sent an event from the Pubsub service for the 'urn:xmpp:bookmarks:0' node, it SHOULD join the room immediately if the 'autojoin' attribute is both present and true.
On the other hand, if the 'autojoin' attribute is absent or false, or when the event is a retract notification, the client SHOULD leave the room immediately.
Publish-Subscribe (XEP-0060)  is used for data storage, specifically through the use of private, personal pubsub nodes (described in Best Practices for Persistent Storage of Private Data via Publish-Subscribe (XEP-0223) ) hosted at the user's virtual pubsub service (see Personal Eventing Protocol (XEP-0163) ).
It is encouraged to at least support unification between Private XML Storage because as of 2019 this is still the storage backend that is implemented in the majority of clients.
A server that supports unifying bookmarks from Private XML Storage (XEP-0049)  and Bookmarks 2 (This Time it's Serious) (XEP-0402)  SHOULD announce the "urn:xmpp:bookmarks:0#compat" feature on the account. Clients may use that feature as an indication that it is safe to store bookmarks using only Bookmarks 2 (This Time it's Serious) (XEP-0402)  without losing backward compatibility to clients that are only using Private XML Storage (XEP-0049) .
A server that supports unifying bookmarks between Best Practices for Persistent Storage of Private Data via Publish-Subscribe (XEP-0223)  and Bookmarks 2 (This Time it's Serious) (XEP-0402)  SHOULD announce the "urn:xmpp:bookmarks:0#compat-pep" feature on the account.
When a client publishes a new item, the server MAY collate all items, casting them into the 'storage:bookmarks' namespace and setting the jid attribute to the item id in each case. When contained within a storage element qualified by the 'storage:bookmarks' namespace, this will be the correct format for both current and previous variants of Bookmark Storage (XEP-0048) 
If a client publishes a replacement list of bookmarks via the older specifications, a server MAY examine the list and update the individual items as required, sending updates or retraction notifications as needed. Servers electing to perform this OPTIONAL behaviour SHOULD NOT send notifications for unchanged items.
This specification relies fully on a number of others. Most particularly, support for this protocol is available if Best Practices for Persistent Storage of Private Data via Publish-Subscribe (XEP-0223)  is supported.
Server side unification between Private XML Storage (XEP-0049)  bookmarks and Bookmarks 2 is announced with the feature "urn:xmpp:bookmarks:0#compat" on the account.
Server side unification between the current use of XEP-0048 bookmarks (PEP) is annouced with the feature "urn:xmpp:bookmarks:0#compat-pep" on the account.
The authors would like to note that much of the syntax description was copied exactly from Bookmark Storage (XEP-0048)  by Rachel Blackman, Peter Millard, and Peter Saint-Andre. Much of the remainder of this specification is based closely on their work.
Security considerations related to object persistence via publish-subscribe are described in XEP-0060 and XEP-0223.
The client needs to make sure that the server actually supports the "http://jabber.org/protocol/pubsub#publish-options" feature, before relying on it. If it's not supported, the client should configure the 'urn:xmpp:bookmarks:0' node first (see xep-0060), before adding any bookmarks.
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