Добавить свои мета-данные в head - Joomla 3.x: Общие вопросы

<meta name="DC.Title" content="<?php echo $this->title; ?>">
<meta name="DC.Description" content="<?php echo $this->description; ?>">
<meta name="DC.Identifier" content="<?php echo JURI::current(); ?>">

<meta name="DC.Subject" content="<?php
$document=& JFactory::getDocument();
$metakeywords = $document->getMetaData('keywords');
echo ''.$metakeywords.'';
?>">

<meta name="DC.Description" content="<?php echo $this->keywords; ?>">

$doc = \Joomla\CMS\Factory::getDocument();
echo'<pre>';print_r( $doc );echo'</pre>'.__FILE__.' '.__LINE__;
die(__FILE__ .' '. __LINE__ );

$doc = \Joomla\CMS\Factory::getDocument();
if($doc->getType() == 'html')
{
       $html = '<meta name="DC.Title" content="'.$this->title.'">' ;
       $doc->addCustomTag($html) ;
}

$metakeywords = $this->getMetaData('keywords');
$metaauthor = $this -> getMetaData('author');

   <meta name="DC.Content" content="<?php echo  $metakeywords; ?>">
    <meta name="DC.Creator" content="<?php echo  $metaauthor; ?>">

<meta name="DC.Description" content="<?php echo $this->description; ?>">

<meta name="DC.Content" content="<?php echo $this->keywords; ?>">

JHtml::_('behavior.caption');
 
$fieldValue13 = $this->item->jcfields[13]->rawvalue; 
$fieldValue6 = $this->item->jcfields[6]->rawvalue; 

$fieldValue3 = $this->item->jcfields[3]->rawvalue; 
$fieldValue4 = $this->item->jcfields[4]->rawvalue; 

$dcpublisher = '<meta name="DC.Publisher" content="IWL RAS">';

$dctitle = '<meta name="Dc.Tiltle" content="'.$this->item->title.'">';

$dcabstract = '<meta name="DC.Description"  content="'. $fieldValue6. $fieldValue13 .'">' ; 

$dcmetakeys = '<meta name="DC.Subject"  content="'. $fieldValue3. $fieldValue4 .'">' ; 

$dclanguage ='<meta name="DC.Language" scheme="ISO639-1"  content="'.$this->item->language.'">';  

$dcident = '<meta name="DC.Identifier" content="'. JURI::current().'">';

$document = JFactory::getDocument();

$document->addCustomTag($dcpublisher);
$document->addCustomTag($dctitle);
$document->addCustomTag($dcabstract);
$document->addCustomTag($dcmetakeys);
$document->addCustomTag($dclanguage);
$document->addCustomTag($dcident);

$dclanguage ='<meta name="DC.Language" scheme="ISO639-1"  content="'.$this->item->language.'">';  
$fieldValue1 = $this->item->jcfields[1]->rawvalue; 
$fieldValue27 = $this->item->jcfields[27]->rawvalue; 
$fieldValue29 = $this->item->jcfields[29]->rawvalue; 
$fieldValue13 = $this->item->jcfields[13]->rawvalue; 
$fieldValue31 = $this->item->jcfields[31]->rawvalue; 
$fieldValue33 = $this->item->jcfields[33]->rawvalue; 

$dcauthor1  = '<meta name="DC.Creator" content="'.$fieldValue1.'">'  ;
  
if ($fieldValue27 !== ''){
$dcauthor27  = '<meta name="DC.Creator" content="'.$fieldValue27.'">' ;} 

if ($fieldValue29 !== ''){
$dcauthor29  = '<meta name="DC.Creator" content="'.$fieldValue29.'">' ;} 

$dcauthor13  = '<meta name="DC.Creator" content="'.$fieldValue13.'">' ;

if ($fieldValue31 !== ''){
$dcauthor31  = '<meta name="DC.Creator" content="'.$fieldValue31.'">' ;}

if ($fieldValue33 !== ''){
$dcauthor33  = '<meta name="DC.Creator" content="'.$fieldValue33.'">' ;}

$document = JFactory::getDocument();
$document->addCustomTag($dclanguage);
$lang = JFactory::getLanguage()->getTag();
if ($lang=='ru-RU') {
$document->addCustomTag($dcauthor1);
$document->addCustomTag($dcauthor27);
$document->addCustomTag($dcauthor29);
}
if ($lang=='en-GB') {
$document->addCustomTag($dcauthor13);
$document->addCustomTag($dcauthor31);
$document->addCustomTag($dcauthor33); 
}