[_Ra]

Спасибо за ответ! К сожалению, я не силен в php. Задачу решил таким образом:

yandexnews = PAGE
yandexnews {
  typeNum = 110

  10 >
  10 < plugin.tt_news
  10 {
        useHRDates = 1
        useHRDatesSingle = 1
        dontUseBackPid = 1
        general_stdWrap.stripHtml = 1

        displayXML {
          rss2_tmplFile = путь/rss_2_yandex.tmpl
          subheader_stdWrap.crop >
        }
  }
  10.pid_list >
  10.pid_list = 43
  10.singlePid = 42
  10.defaultCode = XML

  config {
    disableAllHeaderCode = 1
    additionalHeaders = Content-type:text/xml
    no_cache = 1
    xhtml_cleaning = 0
  }
}

rss_2_yandex.tmpl :

<!-- ###TEMPLATE_RSS2### begin -->###XML_DECLARATION###
<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:yandex="http://news.yandex.ru">
	<channel>
		<!-- ###HEADER### begin -->
		<title>###SITE_TITLE###</title>
		<link>###SITE_LINK###</link>
		<description>###SITE_DESCRIPTION###</description>
		###SITE_LANG###
		<image>
			<title>###SITE_TITLE###</title>
			<url>###IMG###</url>
			<link>###SITE_LINK###</link>
			<width>###IMG_W###</width>
			<height>###IMG_H###</height>
			<description>###SITE_DESCRIPTION###</description>
		</image>
		###NEWS_LASTBUILD###
		<!-- ###HEADER### end -->
		<!-- ###CONTENT### begin -->
		<!-- ###NEWS### begin -->
		<item>
			<title>###NEWS_TITLE###</title>
			<link>###NEWS_LINK###</link>
			<description>###NEWS_SUBHEADER###</description>
			<yandex:full-text>###NEWS_CONTENT###</yandex:full-text>
                                  ###NEWS_CATEGORY###
			<pubDate>###NEWS_DATE###</pubDate>
			###NEWS_RSS2_ENCLOSURES###
		</item>
		<!-- ###NEWS### end -->
		<!-- ###CONTENT### end -->
	</channel>
</rss><!-- ###TEMPLATE_RSS2### end -->

Посмотрим, примет ли Яндекс такой поток