Textpattern (TXP) - How to get a page dependent meta description

Maybe the logic can also be used for other Blog/CMS-systems ...!?

The sense of a page dependent meta description is a better acceptance by search engines and the presentation of your site is more nice because many search engines show the meta description tag as a site description in a result page.

I had a Textpattern feature request for a page dependent meta description plug-in but found the TXP solution myself through some research in the Textpattern forum by combining some hints. Here is my solution:

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