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Ok, here is my proposal. Use a link to an external resource with all the information you want attached to that page like:

    <link rel="data" type="data/json" href="http://example.com/recipes/chicken.js" />
    <link rel="data" type="data/xml" href="http://example.com/recipes/chicken.xml" />
The resource can be cached, served static or even included in the page inside a <script data> tag

Here is the html:

    <div itemid="1234">Chicken marsala</div>
    <div itemid="1235">Fried chicken</div>
    <div itemid="1236">Chicken curry</div>
Here is the data island in json:

    {
      head:{
        title:'',
        source:'',
        version:''
      },
      items:[
        {
          id:'1234',
          type:'recipe',
          title:'Chicken marsala',
          ingredients:'here...'
        },
        {
          id:'1235',
          type:'recipe',
          title:'Fried chicken',
          ingredients:'here...'
        }
      ]
    }
Here is the data island in xml:

    <data>
      <head>
        <title>here</title>
        <source></source>
        <version></version>
      </head>
      <items>
        <item id="1234" type="recipe">
          <title>chicken marsala</title>
          <ingredients>here...</ingredients>
        </item>
        <item id="1235" type="recipe">
          <title>fried chicken</title>
          <ingredients>here...</ingredients>
        </item>
      </items>
    </data>


actually that's what rel="alternative" is used for; an alternative representation of the current page. You something like this could be done:

  <link rel="alternative" type="application/event+json" href="http://example.com/events/2010/06/03/schweet.json" />


Actually after reading the microdata spec, there's a application/microdata+json format that would probably work better:

http://dev.w3.org/html5/md/#application-microdata-json

So you'd have an alternative resource

  <link rel="alternative" type="application/microdata+json" href="http://dev.w3.org/html5/md/#application-microdata-json" />
That file would look like this:

   {
    "items": [
    {
      "id": "http://example.com/events/2010/06/03/schweet",
      "type": "http://schema.org/Event",
      "properties": {
        "startDate": ["2010-06-03"],
        "location": [{
          "id": "http://example.com/places/my-crib",
          "type": "http://schmea.org/Place",
          "properties": {
            "url": ["http://example.com/places/my-crib"],
            "address": [{
              "type": "http://schema.org/PostalAddress",
              "properites": {
                "addressLocality": "Knoxville",
                "addressRegion": "TN"
              }
            }]
          }
        }]
      }
    }
    ]
   }
Who knows if Google will actually use that file though.




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