====== Фильтрация по годам ======
  - Вставляем код решения в ТДС перед вызовом метода show():<code php>$oCore_QueryBuilder_Select = Core_QueryBuilder::select("extract( year from datetime) as res" )
	->from('informationsystem_items')
	->where('informationsystem_id', '=', Core_Array::get(Core_Page::instance()->libParams, 'informationsystemId'))
	->where('informationsystem_group_id', '=', $Informationsystem_Controller_Show->group)
	->where('active', '=', 1)
	->where('deleted', '=', 0)
	->groupby('res')
;
$aYears = $oCore_QueryBuilder_Select->execute()->asAssoc()->result();


$yearsXML = Core::factory('Core_Xml_Entity')->name('years');
foreach ($aYears as $aYear)
{
 $yearsXML->addEntity(
		Core::factory('Core_Xml_Entity')
			->name('year')->value($aYear['res'])
	);
}

$Informationsystem_Controller_Show->addEntity($yearsXML);
// /KAD

// KAD: фильтрация по годам

$year = (int)Core_Array::getGet("year", 0);

if ($year)
{
	$datefrom = $year . "-01-01 00:00:00";
	$dateto = ($year+1) . "-01-01 00:00:00";

	if (!$Informationsystem_Controller_Show->item)
	{
		$Informationsystem_Controller_Show->informationsystemItems()->queryBuilder()
			->where('datetime', '>', $datefrom) 
			->where('datetime', '<', $dateto);
		
		$Informationsystem_Controller_Show->addEntity(Core::factory('Core_Xml_Entity')->name('year')->value($year));
	}
}</code>
  - В xsl там где нужен вывод годов, вставляем код:<code>
			<xsl:for-each select="years/year">
				<xsl:sort select="." order="descending"/>
				<a href="?year={.}">
					<xsl:if test="/informationsystem/year = .">
						<xsl:attribute name="class">active</xsl:attribute>
					</xsl:if>
					<xsl:value-of select="."/></a>
			</xsl:for-each>
</code>