If referenced sites are syndicated, this loop is also associated with a SYNDIC_ARTICLES  loop which makes it possible to retrieve a list of articles from these sites.
Selection Criteria
You should use one of the following criteria to indicate which sites are selected.
-  {tout} returns all referenced sites.
-  {id_syndic} returns the referenced site identified by id_syndic.
-  {id_rubrique} returns the sites referenced in this section.
-  {id_secteur} returns the sites referenced in this sector.
-  {id_mot}  returns the sites related to the current keyword (inside a MOTS loop, or a URL parameter).
-  {titre_mot=xxxx} , or {type_mot=yyyy} returns the sites related to the keyword named "xxxx", or related to keywords in the keyword group named "yyyy". If you provide several  {titre_mot=xxxx} criteria (or several {type_mot=yyyy} criteria), you will select those that have ALL of those keywords at the same time.
-  {id_groupe=zzzz} allows you to select the sites related to a keyword group; effectively the same as {type_mot} above, but since an identifier (number of the group), the syntax of the internal code will be cleaner.
Display Criteria
You can use any of the criteria applicable to all loops.
-  {syndication=oui}, or {syndication=non}  are used to display only the referenced sites that are subject to syndication, or which are only referenced without being syndicated. A possible off value indicates that a syndication error has been detected.
-  {moderation=oui}  displays the syndicated sites whose links are initially blocked pending moderation; the reverse of this criterion is {moderation!=oui}.
Tags of this loop
- Tags retrieved from the database
The following tags correspond to the elements retrieved directly from the database. You can also use them as sorting criteria (in general: {par nom_site}).
-  #ID_SYNDIC is the unique identifier of the syndicated site. For example, to return the page describing the site (site.html in /dist) with the following code:
<BOUCLE_sites(SITES) {id_rubrique} {par nom_site}>
<li><a href="[(#ID_SYNDIC|generer_url_site)]">#NOM_SITE</a></li>
</BOUCLE_sites>
-  #NOM_SITE displays the name of the syndicated site.
-  #URL_SITE displays the (URL) address of the syndicated site.
-  #DESCRIPTIF displays the description of the syndicated site.
-  #ID_RUBRIQUE displays the section number containing this syndication.
-  #ID_SECTEUR displays the sector number (section at the root of the site) containing this syndication.
- Other tags
-  #LOGO_SITE returns the logo assigned to the site.
-  #URL_SYNDIC returns the (URL) address of the syndication file of this site.
-  #FORMULAIRE_FORUM generates and displays the form used for posting forum messages about this site. For more information on this, see also "Forms".
-  #PARAMETRES_FORUM generates the list of variables used by the form interface used for posting forum messages about this site. For instance:
[<a href="spip.php?page=forum&(#PARAMETRES_FORUM)">Respond to this forum</a>]
It can be passed a parameter specifying the return address after posting the message. 
For example:
<a href="spip.php?page=forum&(#PARAMETRES_FORUM{#SELF})">Respond to this message</a> 
will redirect the visitor tback to the current page once the message has been validated.