<xsd:attributeGroup id="attGp.xMin" name="xMin">
    <xsd:attribute id="att.xMin" name="xMin" type="xsd:double">
        <xsd:annotation>
            <xsd:documentation>
                <h:div class="summary" xmlns:h="http://www.w3.org/1999/xhtml">Minimum xValue.</h:div>
                <h:div class="description" xmlns:h="http://www.w3.org/1999/xhtml">Annotates x-axis data with a minimum 
                value. This need not be algorithmically deducible from the data 
                and is typically used for the extent of a _peak_ or _peakGroup_. 
                It uses xUnits or the same units as the data. There may or may not 
                be a _xMax_ attribute but if so xMin should be less than or equals 
                to it.</h:div>
            </xsd:documentation>
        </xsd:annotation>
    </xsd:attribute>
</xsd:attributeGroup>