In the schema file the descriptions of the elements <getdcdata>, and <setdcdata> were corrected according to their occurence:
old: <xs:element name="getdcdata" type="getdcdataType"/>, or <xs:element name="setdcdata" type="setdcdataType"/>
new: <xs:element name="getdcdata" type="getdcdataType" minOccurs="0" maxOccurs="1"/>, or <xs:element name="setdcdata" type="setdcdataType" minOccurs="0" maxOccurs="1"/>
Additionally, in some examples errors in numeric values were corrected which crept in due to sloppy "copy & paste" work.