Code contribution – hope you can add into next release

Hi, this is not a bug but a contribution, couldn’t find anywhere else to put it.

Basically my scenario is that I need to add some extra tags inside each <loc> – in my case it is alternate lang tags, but there are lots of possibilities for other people (this is also one of the ideas on your uservoice)

By simply applying a filter to the xml as it is being rendered this becomes a simple task of hooking to the filter in another plugin.
1 extra line of code in your core adds a huge amount of customisation options.

If you will consider adding this into your core then great, otherwise I will have to make a fork to distribute to my users (which I would rather not!)

class GoogleSitemapGeneratorPage

public function Render() {

		if($this->_url == "/" || empty($this->_url)) return '';

		$r = "";
		$r .= "\t<url>\n";
		$r .= "\t\t<loc>" . $this->EscapeXML($this->_url) . "</loc>\n";
		if($this->_lastMod > 0) $r .= "\t\t<lastmod>" . date('Y-m-d\TH:i:s+00:00', $this->_lastMod) . "</lastmod>\n";
		if(!empty($this->_changeFreq)) $r .= "\t\t<changefreq>" . $this->_changeFreq . "</changefreq>\n";
		if($this->_priority !== false && $this->_priority !== "") $r .= "\t\t<priority>" . number_format($this->_priority, 1) . "</priority>\n";
		$r .= "\t</url>\n";
		return $r;
	}

And I have changed to:

public function Render() {

		if($this->_url == "/" || empty($this->_url)) return '';

		$r = "";
		$r .= "\t<url>\n";
		$c = "\t\t<loc>" . $this->EscapeXML($this->_url) . "</loc>\n";
		if($this->_lastMod > 0) $r .= "\t\t<lastmod>" . date('Y-m-d\TH:i:s+00:00', $this->_lastMod) . "</lastmod>\n";
		if(!empty($this->_changeFreq)) $r .= "\t\t<changefreq>" . $this->_changeFreq . "</changefreq>\n";
		if($this->_priority !== false && $this->_priority !== "") $r .= "\t\t<priority>" . number_format($this->_priority, 1) . "</priority>\n";
		$r.= apply_filters("sm_render_xml", $c, $this->_url);
		$r .= "\t</url>\n";
		return $r;
	}

https://wordpress.org/plugins/google-sitemap-generator/