-<xsd:schema elementFormDefault="qualified" attributeFormDefault="unqualified" targetNamespace="http://www.witsml.org/schemas/131/addendum/combo" version="1.3.1">
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 <xsd:include schemaLocation="typ_dataTypes.xsd"/>
 <xsd:include schemaLocation="attgrp_uid.xsd"/>
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-<xsd:complexType name="cs_productVolumelPortDifference" final="#all">
-<xsd:annotation>
 <xsd:documentation>Product Volume Port Differential characteristics.</xsd:documentation>
 </xsd:annotation>
-<xsd:sequence>
-<xsd:element name="port" type="witsml:refNameString" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>A port on the other end of an internal connection. This should always be specified if a Product Flow Network is being referenced by this report. If this is not specified then there is an assumption that there is only one other port for the unit. For example, if this end of the connection represents an inlet port then the implied other end is the outlet port for the unit.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="presDiff" type="witsml:pressureMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The differential pressure between the ports.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="tempDiff" type="witsml:thermodynamicTemperatureMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The differential temperature between the ports.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="chokeSize" type="witsml:lengthMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The size of the choke. This characterizes the overall unit with respect to the flow restriction between the ports. The restriction might be implemented using a valve or an actual choke.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="chokeRelative" type="witsml:lengthPerLengthMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The relative size of the choke restriction. This characterizes the overall unit with respect to the flow restriction between the ports. The restriction might be implemented using a valve or an actual choke.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
 </xsd:sequence>
-<xsd:attributeGroup ref="witsml:attgrp_uid">
-<xsd:annotation>
 <xsd:documentation>The unique identifier of the recurring element.</xsd:documentation>
 </xsd:annotation>
 </xsd:attributeGroup>
 </xsd:complexType>
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 </xsd:schema>