<xsd:attribute name="periodicity" id="att.periodicity" type="xsd:positiveInteger">
<xsd:annotation>
<xsd:documentation>
<h:div class="summary" xmlns:h="http://www.w3.org/1999/xhtml">Periodicity of the system.</h:div>
<h:div class="summary" xmlns:h="http://www.w3.org/1999/xhtml">This represents the number of dimensions (or coordinate axes) along periodic behaviour occurs and can be supported by symmetry operators or other transformations. Periodicity must never exceed dimensionality.</h:div>
</xsd:documentation>
</xsd:annotation>
</xsd:attribute>
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