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   $args = array();
    $select = "SELECT i.* , f.* ";
    $from = "FROM $FOF_FEED_TABLE f, $FOF_ITEM_TABLE i, $FOF_SUBSCRIPTION_TABLE s ";
    $where = sprintf("WHERE s.user_id = %d AND s.feed_id = f.feed_id AND f.feed_id = i.feed_id ", $user_id);
 
    if(!is_null($feed) && $feed != "")
    {
        $where .= sprintf("AND f.feed_id = %d ", $feed);
    }
    

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// Returns a single promise that emits success or error when the given promises
// are complete.
//
//   var promises = require('promise-group')
//   promises.group(promise1, promise2).addCallback(...)
//
exports.group = function() {
  return new PromiseGroup(Array.prototype.slice.call(arguments)).promise;
}
 

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<?xml version=’1.0′ encoding=’UTF-8′?>
<XRD xmlns=’http://docs.oasis-open.org/ns/xri/xrd-1.0′>
  <Host xmlns=’http://host-meta.net/xrd/1.0′>hosted-by-google.com</Host>
  <Link>
    <Title>Resource Descriptor</Title>
    <Rel>host-meta</Rel>
    <URITemplate>http://xrd.google.com/{%uri}</URITemplate>
  </Link>
</XRD>

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<?xml version=’1.0′ encoding=’UTF-8′?>
<XRD xmlns=’http://docs.oasis-open.org/ns/xri/xrd-1.0′>
  <Host xmlns=’http://host-meta.net/xrd/1.0′>example.com</Host>
  <Link>
    <Title>Resource Descriptor</Title>
    <Rel>describedby</Rel>
    <URITemplate>http://example.com/api?uri={%uri}</URITemplate>
  </Link>
  <Link>
    <Title>Resource Descriptor</Title>

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<?xml version=’1.0′ encoding=’UTF-8′?>
<XRD xmlns=’http://docs.oasis-open.org/ns/xri/xrd-1.0′>
  <Subject>acct:[email protected]</Subject>
  <Alias>http://example.com/profiles/joe</Alias>
  <Link>
    <Rel>http://portablecontacts.net/spec/1.0</Rel>
    <Rel>describedby</Rel>
    <URI>http://example.com/api/people/</URI>
  </Link>
  <Link>