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In order to add fallbacks support we need to be able to match starting tags to ending tags in order to retrieve the content.

Example

<div data-sd="property">
    Content
    <div data-sd="property">
        Content
    </div>
    <meta data-sd="property" content="Content" />
</div>

First match

    Content
    <div data-sd="property">
        Content
    </div>
    <meta data-sd="property" content="Content" />

Second match

        Content

Third match

                                      Content

The problem

• Match self-contained tags
• Match starting tags to ending tags
• Match nested starting tags to ending tags
• Ordered matches, up → down matches flow

The solutions

• It's nearly impossible to solve that problem with regex, see why: https://stackoverflow.com/questions/701166/can-you-provide-some-examples-of-why-it-is-hard-to-parse-xml-and-html-with-a-reg
• Use a HTML DOM parser, but the PHP DOMDocument class filters the HTML, so it changes the content
• Use a HTML DOM parser, third-party library

Is there any Joomla parser library to solve that problem?

The problem

If you wish to declare multiple properties for an item, you should be able to do so using itemprop="property1 property2 property3".

With the current setup, only property1 would be parsed and the rest discarded. It might also be the case that I have a specific property which is in something other than position 1, and if the item in position 1 is valid they will never be parsed.

Source: http://www.w3.org/TR/2009/WD-html5-20090825/microdata.html

Example:

An element introducing a property can also introduce multiple properties at once, to avoid duplication when some of the properties have the same value.

Here we see an item with two properties, "favorite-color" and "favorite-fruit", both set to the value "orange":

<div item>
<span itemprop="favorite-color favorite-fruit">orange</span>
</div>

Example use 'in the wild'

http://www.seatrade-global.com/news/americas/would-selling-apl-logistics-be-good-for-nol.html

<span itemprop="CopyrightHolder publisher provider">Seatrade Communications Limited</span>

http://www.google.com/webmasters/tools/richsnippets?q=http%3A%2F%2Fwww.seatrade-global.com%2Fnews%2Famericas%2Fwould-selling-apl-logistics-be-good-for-nol.html

This validates as:

copyrightholder: Seatrade Communications Limited
publisher: Seatrade Communications Limited
provider: Seatrade Communications Limited

Possible workarounds

Perhaps consider some kind of logic which states if the first item is valid, use it, then check other items and add them if they are valid, exclude if they are not. If the first item is not valid it should naturally move to the next one.

TinyMCE strips that information, example:
<meta data-sd="dataPublished" content="ISO" />
is removed from the content by the editor.