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All it does is output an article thumbnail. I’m really not sure why txp:thumbnail doesn’t appear to work in RC3, but it really didn’t seem necessary with zem_article_thumb, until it broke in one particular instance for some strange reason that I couldn’t figure out.
So, I went back to the txp:article source code to find out how it worked. Basically, it returned the article ID number and added an image url string to locate the image in the default image directory. Since thumbnails are created in Textpattern with the addition of the letter “t”, it was just a simple matter of adding it to the url string.
That’s all it does.
To see how I’ve used it for a thumbnail gallery, you can see my page template