Add @MATCH to metadata for DTD element values

Description

We have test for the values of attributes to ensure the proper format. And for localized data, we have the suite of console checks.

But we don't have tests for unlocalized element values, such as for supplemental data. For example, there is no test that the element value here is a correct unit.
<unitPreference regions="001">square-kilometer</unitPreference>

I suggest adding (and documenting) @MATCH data for element values. Then

{{<!ELEMENT unitPreference ( #PCDATA ) >
<!--@ORDERED-->
}}
could be augmented to something like:

{{<!ELEMENT unitPreference ( #PCDATA ) >
<!--@ORDERED-->
<!--@MATCH:validity/unit-->
}}

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Reporter

Mark Davis

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