<div>From this IG</div></td></tr>
</table>



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  <a name="inv"> </a>
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  <h4>Constraints</h4>
<table class="list">
<tr><td width="60"><b>Id</b></td><td><b>Grade</b></td><td><b>Path(s)</b></td><td><b>Détails</b></td><td><b>Requirements</b></td></tr>
<tr><td>ele-1</td><td>error</td><td>**ALL** elements</td><td>All FHIR elements must have a @value or children<br/>: hasValue() or (children().count() &gt; id.count())</td><td><