Не выводятся элементы инфосистемы из всех групп

...
<xsl:template match="/informationsystem">
         <xsl:apply-templates select="informationsystem_group"/>
</xsl:template>
<!-- Информационная система -->
<xsl:template match="informationsystem_group">
  <xsl:for-each select="informationsystem_group">
  <xsl:variable name="groupId" select="@id"/>
    <xsl:for-each select="//informationsystem_item[informationsystem_group_id = @groupId]">
      <xsl:apply-templates select="informationsystem_item"/>
    </xsl:for-each>  
  </xsl:for-each>
</xsl:template>

<!-- Шаблон вывода информационного элемента -->
<xsl:template match="informationsystem_item">
...

   <informationsystem_group id="9">
      <informationsystem_id>16</informationsystem_id>
      <siteuser_id>0</siteuser_id>
      <parent_id>0</parent_id>
      <shortcut_id>0</shortcut_id>
      <name>ПЛИТКА</name>
      <description></description>
      <sorting>0</sorting>
      <path>9</path>
      <image_large></image_large>
      <image_small></image_small>
      <indexing>1</indexing>
      <subgroups_count>0</subgroups_count>
      <subgroups_total_count>0</subgroups_total_count>
      <items_count>4</items_count>
      <items_total_count>4</items_total_count>
      <seo_title></seo_title>
      <seo_description></seo_description>
      <seo_keywords></seo_keywords>
      <siteuser_group_id>-1</siteuser_group_id>
      <active>1</active>
      <guid>560F57C4-C4E1-A839-2D5E-D293088B751D</guid>
      <sns_type_id>0</sns_type_id>
      <url>/shoplist/9/</url>
      <dir>/upload/information_system_16/0/0/9/group_9/</dir>
   </informationsystem_group>
   <informationsystem_group id="13">
      <informationsystem_id>16</informationsystem_id>
      <siteuser_id>0</siteuser_id>
      <parent_id>0</parent_id>
      <shortcut_id>0</shortcut_id>
      <name>ПОПУЛЯРНЫЕ</name>
      <description></description>
      <sorting>0</sorting>
      <path>13</path>
      <image_large></image_large>
      <image_small></image_small>
      <indexing>1</indexing>
      <subgroups_count>0</subgroups_count>
      <subgroups_total_count>0</subgroups_total_count>
      <items_count>4</items_count>
      <items_total_count>4</items_total_count>
      <seo_title></seo_title>
      <seo_description></seo_description>
      <seo_keywords></seo_keywords>
      <siteuser_group_id>-1</siteuser_group_id>
      <active>1</active>
      <guid>BAD4F1D6-0E8E-AF27-3CD3-C58A8E5DED1F</guid>
      <sns_type_id>0</sns_type_id>
      <url>/shoplist/13/</url>
      <dir>/upload/information_system_16/0/1/3/group_13/</dir>
   </informationsystem_group>
   <informationsystem_group id="12">
      <informationsystem_id>16</informationsystem_id>
      <siteuser_id>0</siteuser_id>
      <parent_id>0</parent_id>
      <shortcut_id>0</shortcut_id>
      <name>СМЕСИ</name>
      <description></description>
      <sorting>0</sorting>
      <path>12</path>
      <image_large></image_large>
      <image_small></image_small>
      <indexing>1</indexing>
      <subgroups_count>0</subgroups_count>
      <subgroups_total_count>0</subgroups_total_count>
      <items_count>0</items_count>
      <items_total_count>0</items_total_count>
      <seo_title></seo_title>
      <seo_description></seo_description>
      <seo_keywords></seo_keywords>
      <siteuser_group_id>-1</siteuser_group_id>
      <active>1</active>
      <guid>6B85CEEF-48D9-6DB6-16D8-363423BD496D</guid>
      <sns_type_id>0</sns_type_id>
      <url>/shoplist/12/</url>
      <dir>/upload/information_system_16/0/1/2/group_12/</dir>
   </informationsystem_group>