The child elements of the <server-data/> elements are <host/> elements. Each <host/> element describes a virtual host, and has a 'jid' attribute that contains its JID.

An importing server MAY automatically adjust its list of virtual hosts to fit the ones present in the data being imported. If it does not, it SHOULD notify the operator about any mismatch.

Each user is represented by a <user/> element under the <host/> element. The <user/> element MUST have a 'name' attribute, which contains the node part of the user's JID, and SHOULD have a 'password' attribute, which contains the user's password.

Each <user/> element SHOULD contain the user's roster in the form of a <query/> element qualified by the 'jabber:iq:roster' namespace. This element contains the user's roster in the same format as when retrieving the roster from the server, as described in section 7.3 of &xmppim;.

If the exporting server stores messages received while the user was offline, it SHOULD include an <offline-messages/> element as a child of the <user/> element. This element contains all the stored messages to the user, if any, as <message/> elements qualified by the 'jabber:client' namespace, starting with the oldest.

Private data stored by the server as specified in &xep0049; is represented in this format by including a <query/> element qualified by the 'jabber:iq:private' namespace as a child of the <user/> element. This <query/> element in turn contains all elements saved in private XML storage.

By &xep0054;, users can store vCards on the server. In this specification, vCards are child elements of the <user/> element, namely a <vCard/> element qualified by the 'vcard-temp' namespace.

Privacy lists, as specified in &xep0016;, are represented in this format by including a <query/> element qualified by the 'jabber:iq:privacy' namespace as a child of the <user/> element. This element should contain all privacy lists associated with the user. A default privacy list, if set, is specified by including a <default/> element as a child of the <query/> element.

Each <user/> element SHOULD contain pending incoming subscription requests associated with the user's account. Incoming subscription requests are represented by including <presence/> elements qualified by the 'jabber:client' namespace with the 'type' attribute set to a value of 'subscribe' as children of the <user/> element.

If an exporting server chooses to split the data into several files, it SHOULD use the following scheme:

The main file contains the <server-data/> element, which contains nothing but one <include/> element for each host. The file included for a certain host is placed in the same directory as the main file, and is named by appending ".xml" to the JID of the host, e.g. "capulet.com.xml".

Each host file contains a <host/> element, which contains nothing but one <include/> element for each user of the host. The file included for a certain user is placed in a subdirectory whose name is the JID of the host, and is named by appending ".xml" to the node part of the user's JID, e.g. "capulet.com/juliet.xml".

Each user file contains a <user/> element, and includes all data relating to that user.

The definition of JIDs ensures that this generates valid file names on traditional Unix-like file systems, except for possible length constraints. However, various constraints may force an exporting server to alter this scheme. In any case, the importing server MUST NOT rely on this layout, but MUST do proper XInclude processing.

This specification defines the following XML namespace:

• urn:xmpp:pie:0

The ®ISTRAR; includes the foregoing namespace in its registry at &NAMESPACES;, as described in Section 4 of &xep0053;.