Как сделать выборку из нужной мне ИС?

<?php

    $Informationsystem_Controller_Show = new Informationsystem_Controller_Show(
                 Core_Entity::factory('Informationsystem', 1)
    );

    $Informationsystem_Controller_Show
        ->informationsystemItems()
        ->queryBuilder()
        ->clearOrderBy()
        ->orderBy('showed', 'DESC');

    $Informationsystem_Controller_Show
                ->xsl(Core_Entity::factory('Xsl')->getByName('ПопулярныеНовости'))
            ->limit(5)
            ->show();
?>

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE xsl:stylesheet>
<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:hostcms="http://www.hostcms.ru/"
    exclude-result-prefixes="hostcms">
    
    <xsl:output xmlns="http://www.w3.org/TR/xhtml1/strict" doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN" encoding="utf-8" indent="yes" method="html" omit-xml-declaration="no" version="1.0" media-type="text/xml"/>
    
    <xsl:template match="/">
        <xsl:apply-templates select="informationsystem/informationsystem_item"/>
    </xsl:template>
    
    <xsl:template match="informationsystem_item">
        <div class="item-header">
            <a href="{link}">
                <img src="{dir}{image_small}"/>
            </a>
        </div>
        <div class="item-content">
            <h4>
                <a href="{link}">
                    <xsl:value-of disable-output-escaping="yes" select="name"/>
                </a>
            </h4>
            <p>
                <xsl:value-of disable-output-escaping="yes" select="descroption"/>
            </p>
        </div>
    </xsl:template>
    
</xsl:stylesheet>