PHP, XML and HTML-Tags

Hi, I am using successfully the PHP XML-parser. But I have one problem. I like to include html tags into the texts and I don't want them to be interpreted by the parser. But I can't prevent it. It tried &lt; and &rt;, but they get interpreted as "<" and ">", and so I get an error message by the parser. I tried including the html stuff in comments, but then they are completely lost, which is of course normal behaviour. I tried quoting with backslash, e.g. \<p\>, but in vain as well. I would be very happy and thankful, if anybody could help me. Best wishes Bernard