Arbitrary table of key/value pairs in a <meta> tag. Any open standard?

Question

Is there an open standard (microformats'ish) that exists for specifying an arbitrary table of key/value pairs in an HTML meta tag?

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So let's say I had a website about color, and had a page about a 5-color palette. I essentially want to express information represented in the page, in a format that can be gobbled up by third-party services. In this case, it's the five colors that make up the palette. Like this:

<meta name="data" content="color1:'#ffffff',color2:'#ff00ff',color3:'#ffff00',color4:'#00ffff',color5:'#00ff00'" />

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I could roll my own specification, but I really hate doing that if there's something already out there. No need to pollute the web, which is already a quagmire of shady standards...

(p.s. I'm well-aware of RDF. I'd like to specify the content in the page itself... and not require loading another document just for the data.)

Answer 1

I don't know of any open standards relating to <meta> content, but I think JSON would be a fine format to use if all you want are simple key/value pairs.

<meta name='data' content='
  {
      "key1": "Some value",
      "key2": "Another value"
  }' />