Used for attributes of type "quantity", "string" or "boolean". Allows assertion of one or more units, ranges, fraction digits or fixed values. Valid
combinations of attributes are: <li>
<ul>@unit @minInclude @maxInclude @fractionDigits</ul>
<ul>@currency @minInclude @maxInclude @fractionDigits</ul>
<ul>@minLength @maxLength</ul>
<ul>@value</ul>
</li>
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