This attribute is only a placeholder so that all the ISM attributes are not shown
in the schemaGuide for every element. If you refer to the documentation of the
attribute group it will say what attributes should be here.
<xs:element name="relatedResources" type="RelatedResourcesType"><xs:annotation><xs:appinfo><mdr:definition>Each relatedResources element represents a single type of relationship between the resource described in the enclosing ddms:Resource and other identified resources.</mdr:definition></xs:appinfo></xs:annotation></xs:element>