-<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="typ_catalog_interval.xsd"/>
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-<xsd:complexType name="cs_perforation">
-<xsd:sequence>
-<xsd:element name="type" type="witsml:PerforationType" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The type of mechanism used to create the perforations.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="shotCount" type="witsml:positiveCount" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The total number of perforations in the interval.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="shotDensity" type="witsml:perLengthMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The shot density of the perforated interval in number of perforations per length.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="shotDiameter" type="witsml:lengthMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The diameter of the perforation entrance holes.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="shotLength" type="witsml:lengthMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The average length of the perforations measured from the casing to the end of the perforation.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="shotAngle" type="witsml:planeAngleMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The angular range of perforations created by a perforating gun set up for directional shooting, expressed clockwise from north. If perforations are from due north to due east, the angle is 90 degrees.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="shotPhase" type="witsml:planeAngleMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The angle between perforations with respect to the centerline of the wellbore. Examples are 120 deg. for perforations oriented at 0, 120 and 240 deg., and 180 deg. for perforations oriented at opposite sides of the wellbore.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="crushZoneDiameter" type="witsml:lengthMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The assumed diameter of the crushed zone in each perforation in the interval.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="crushDamageRatio" type="witsml:unitlessQuantity" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The ratio of the crush zone permeability to the damaged zone permeability around the perforations.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="gunSize" type="witsml:lengthMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The length of the gun.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="gunType" type="witsml:kindString" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The type of gun used to create the perforation.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="chargeSize" type="witsml:massMeasure" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The size of the explosive charge.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="chargeType" type="witsml:kindString" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>The type of explosive charge.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="formationName" type="witsml:nameString" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>Name of formation penetrated.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
-<xsd:element name="lithostratigraphicName" type="witsml:nameString" minOccurs="0" maxOccurs="1">
-<xsd:annotation>
 <xsd:documentation>Name of formation, regionally dependent.</xsd:documentation>
 </xsd:annotation>
 </xsd:element>
 </xsd:sequence>
 </xsd:complexType>
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 </xsd:schema>