<xsd:attributeGroup id="attGp.atomMap" name="atomMap">
    <xsd:attribute id="att.atomMap" name="atomMap" type="idType">
        <xsd:annotation>
            <xsd:documentation>
                <h:div class="summary" xmlns:h="http://www.w3.org/1999/xhtml">A reference to a map providing mappings between atoms</h:div>
                <h:div class="description" xmlns:h="http://www.w3.org/1999/xhtml">The map will normally be contained within the same document and referenced by its ID. It will contain a list of links with from and to attributes linking atoms. The topology of the linking is defined by the application - it could be overlay of molecular fragments, reactant/product mapping, etc. The reserved phrase "USE_IDS" assume that the sets of atoms are of equal size and have 1:1 mapping between each id. This is another way of saying that the atoms mapped by a given ID are "the same atom". </h:div>
            </xsd:documentation>
        </xsd:annotation>
    </xsd:attribute>
</xsd:attributeGroup>