I'd like to share with others a discovery I made about using meta tags for other purposes than SEO.
My issue was to have a number of articles shown in exactly the order I wanted them to be listed. I also wanted that certain articles shoule be shown as subarticles under main articles (sorted as parents and children). it could be done simple to make a list of links, but then one would have to alter that list every time one added an article. I got the solution when I became aware of the PHP function get_meta_tags(). That function will find and list all the meta tags in an HTML document. - So I added lines like these to my documents:
<meta name="title" content="Title of the document"> <meta name="parent" content="0"> <meta name="number" content="8">
<meta name="title" content="Title of the document"> <meta name="parent" content="8"> <meta name="number" content="8c">
The first of these documents will have no parent; it's a main document. The second will have document no. 8 as parent, and it will be (maybe) no. 3 child under no. 8.
Now let some PHP find all the files in a folder, use the get_meta_tags for each file, make arrays out of the results together with the url of each file, and multisort the arrays. Then let PHP present the list, properly indenting the children. I shall not go into detail here about the PHP. My main object is to draw attention to a nice way of using meta tags. One can see an example of this use at geltzer.dk/nigeria. Here also some folders have been made to show in the order I want it, but that is another matter.