Unique particle attribution rule bit me - why?

[Mike Himstead]

Hi,

I try to write some schemas for interaction of a Java web app with a mainframe application. While we write the schemas the document structure is more or less given by an interface we have to use. We use a given third party library that does all the dirty work for us (connecting to host etc.), what we have to do is to create XML documents representing requests to and responses from the mainframe.

We use XMLBeans for compiling schemas and generating Java sources. Right now I'm stuck with a compilation problem. My IDE (RAD 7) gives the following error:

compileXMLSchema:
     [echo] Compiling XML Schema files to ../Java Generated
  [xmlbean] D:\Projekte\iPAD-Teilapps\bpa-aip\dl10him_dev\bpa-aip\Java Source\de\volkswagen\ipad\aip\integration\schema\XI_MAPOSTKORB_getDataEk.xsd:19:8: error: cos-nonambig: Content model violates the unique particle attribution rule.
  [xmlbean] Time to build schema type system: 1.657 seconds
  [xmlbean] BUILD FAILED

BUILD FAILED

A schema:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
		targetNamespace="http://volkswagen.de/ipad/aip/integration/xml/bind/XIMessage" 
		xmlns="http://volkswagen.de/ipad/aip/integration/xml/bind/XIMessage" 
		elementFormDefault="qualified">
		
	<xs:include schemaLocation="XI_AbstractMessage.xsd" />
	<xs:include schemaLocation="XI_MAPOSTKORB_filterEk.xsd" />	
	
	<xs:complexType name="MAPOSTKORBgetDataEkFilter">
   		<xs:complexContent>
   			<xs:extension base="MAPOSTKORBFilterEkType"/>
   		</xs:complexContent>
   	</xs:complexType>

   	<xs:complexType name="MAPOSTKORBgetDataEkZeile">
   		<xs:complexContent>
   			<xs:extension base="ZeileType">
   				<xs:sequence>
   					<xs:element name="Vorgang" type="fieldWithMode" minOccurs="0"/>
					<xs:element name="Status" type="fieldWithMode" minOccurs="0"/>
					<xs:element name="Bezeichnung" type="fieldWithMode" minOccurs="0"/>
					<xs:element name="MaWert" type="fieldWithMode" minOccurs="0"/>
					<xs:element name="Datum" type="fieldWithMode" minOccurs="0"/>
   					<xs:element name="Code" type="fieldWithMode" minOccurs="0"/>
   					<xs:element name="Bezeichnung" type="fieldWithMode" minOccurs="0"/>
   				</xs:sequence>
   			</xs:extension>
   		</xs:complexContent>
   	</xs:complexType>
		
</xs:schema>

and one of the included schemas:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
		targetNamespace="http://volkswagen.de/ipad/aip/integration/xml/bind/XIMessage" 
		xmlns="http://volkswagen.de/ipad/aip/integration/xml/bind/XIMessage" 
		elementFormDefault="qualified">
	
	<xs:include schemaLocation="XI_METADATA_Daten.xsd" />
	<xs:include schemaLocation="XI_MALIST_getData.xsd" />
	<xs:include schemaLocation="XI_MAPOSTKORB_getDataEk.xsd" />	
	
<!-- simple types -->
	<xs:simpleType name="userIdType">
		<xs:restriction base="xs:string">
			<xs:pattern value="[0-9A-Z]{7,8}"/>
		</xs:restriction>
	</xs:simpleType>
	
	<xs:simpleType name="timestampType">
		<xs:restriction base="xs:string">
			<xs:pattern value="[2-9][0-9]{3}-[0-1][0-9]-[0-3][0-9]-[0-2][0-9]\.[0-5][0-9]\.[0-5][0-9]\.[0-9]{6}"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name="LocaleType">
		<xs:restriction base="xs:string">
			<xs:enumeration value="deDE"/>
		</xs:restriction>
	</xs:simpleType>
<!-- end simple types -->
	
<!-- complex types -->

	<xs:complexType name="fieldWithMode">
		<xs:simpleContent>
			<xs:extension base="xs:string">
				<xs:attribute name="mode">
					<xs:simpleType>
						<xs:restriction base="xs:string">
							<xs:enumeration value="P" />
							<xs:enumeration value="U" />
							<xs:enumeration value="E" />
						</xs:restriction>
					</xs:simpleType>
				</xs:attribute>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>
	
	<xs:complexType name="ZeileType" abstract="true">
		<xs:sequence>
            <xs:element name="TimeStamp" type="timestampType" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="Nr" type="xs:positiveInteger"/>
    </xs:complexType>

	<xs:complexType name="DatenType">
			<xs:sequence>
				<xs:element name="Meta" type="METAType" />
				<xs:choice>
					<xs:group ref="MALISTsumDataDaten" />
					<xs:group ref="MALISTgetDataDaten" />
				</xs:choice>
			</xs:sequence>
    </xs:complexType>
    
	<xs:complexType name="AVREKDatenType">
			<xs:sequence>
				<xs:element name="Meta" type="METAType" />
				<xs:choice>
					<xs:group ref="MAPOSTKORBcountDataEkDaten" />
					<xs:group ref="MAPOSTKORBgetDataEkDaten" />
				</xs:choice>
			</xs:sequence>
    </xs:complexType>   
    
    <xs:group name="MAPOSTKORBcountDataEkDaten">
    	<xs:sequence>
			<xs:element name="Count" type="xs:long" minOccurs="0"/>
		</xs:sequence>
    </xs:group> 
        
    <xs:group name="MAPOSTKORBgetDataEkDaten">
    	<xs:sequence>
			<xs:element name="Zeile" type="MAPOSTKORBgetDataEkZeile"
		            		minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
    </xs:group>    
    
    <xs:group name="MALISTsumDataDaten">
    	<xs:sequence>			
			<xs:element name="Count" type="xs:long" minOccurs="0"/>
			<xs:element name="MaWert" type="xs:double" minOccurs="0" default="0"/>
		</xs:sequence>
    </xs:group>
    
    <xs:group name="MALISTgetDataDaten">  
    	<xs:sequence>
			<xs:element name="Zeile" type="MALISTgetDataZeile"
		            		minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
    </xs:group>
    
    <xs:complexType name="FilterType" abstract="true">
		<xs:sequence>
            <xs:element name="TimeStamp" type="timestampType" minOccurs="0"/>
        </xs:sequence>
    </xs:complexType>
    
	<xs:complexType name="GeschaeftsobjektBaseType" abstract="true">		
   		<xs:attribute name="Methode" type="xs:string" use="required"/>
		<xs:attribute name="UserId" type="userIdType" use="required"/>
		<xs:attribute name="Startzeile" type="xs:positiveInteger"/>
		<xs:attribute name="Zeilen" type="xs:positiveInteger"/>
		<xs:attribute name="Vorhabentyp" type="xs:string" />
		<xs:attribute name="FirstEntry" type="xs:string" />
		<xs:attribute name="Waehrung" type="xs:string" />
	</xs:complexType>
	    
	<xs:complexType name="MALISTResponse">
		<xs:complexContent>
			<xs:extension base="GeschaeftsobjektBaseType">
				<xs:sequence minOccurs="0" maxOccurs="1">
	   			<xs:element name="Filter" type="MALISTgetDataFilter" minOccurs="0" />
	   			<xs:element name="Daten" type="DatenType" minOccurs="0" />
	   		</xs:sequence>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>
	
	<xs:complexType name="MALISTRequest">
		<xs:complexContent>
			<xs:extension base="GeschaeftsobjektBaseType">
				<xs:sequence>
					<xs:element name="Filter" type="MALISTgetDataFilter" />
				</xs:sequence>
			</xs:extension>
		</xs:complexContent>
   	</xs:complexType>
   	
	<xs:complexType name="MAPOSTKORBResponse">
		<xs:complexContent>
			<xs:extension base="GeschaeftsobjektBaseType">
				<xs:sequence minOccurs="0" maxOccurs="1">
	   			<xs:element name="Filter" type="MAPOSTKORBgetDataEkFilter" minOccurs="0" />
	   			<xs:element name="Daten" type="AVREKDatenType" minOccurs="0" />
	   		</xs:sequence>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>   	
   	
	<xs:complexType name="MAPOSTKORBRequest">
		<xs:complexContent>
			<xs:extension base="GeschaeftsobjektBaseType">
				<xs:sequence>
					<xs:element name="Filter" type="MAPOSTKORBgetDataEkFilter" />
				</xs:sequence>
			</xs:extension>
		</xs:complexContent>
   	</xs:complexType>   	
   	
	<xs:attributeGroup name="XICommandAttributeGroup">
		<xs:attribute name="skz" type="xs:string" use="required"/>
		<xs:attribute name="cmd" type="xs:string" use="required"/>
		<xs:attribute name="ver" use="required">
			<xs:simpleType>
				<xs:restriction base="xs:string">
					<xs:pattern value="[0-9][0-9]"/>
				</xs:restriction>
			</xs:simpleType>
		</xs:attribute>
	</xs:attributeGroup>
	
	<xs:complexType name="JioutType">
		<xs:choice>
			<xs:element name="MALIST" type="MALISTResponse" />
			<xs:element name="MAPOSTKORB" type="MAPOSTKORBResponse" />
		</xs:choice>
	</xs:complexType>
	
	<xs:complexType name="XIResultType">
		<xs:sequence>
			<xs:element name="jicontrol">
				<xs:complexType>
					<xs:sequence>
						<xs:element name="Result">
							<xs:complexType>
								<xs:attribute name="rc" type="xs:integer" use="required"/>
								<xs:attribute name="sc" type="xs:string" use="required"/>
								<xs:attribute name="msg" type="xs:string" use="required"/>
								<xs:attribute name="elapsedTime" use="required">
									<xs:simpleType>
										<xs:restriction base="xs:decimal">
											<xs:totalDigits value="15"/>
											<xs:fractionDigits value="2"/>
											<xs:minInclusive value="0.01"/>
											<xs:maxInclusive value="9999999999999.99"/>
										</xs:restriction>
									</xs:simpleType>
								</xs:attribute>
							</xs:complexType>
						</xs:element>
					</xs:sequence>
				</xs:complexType>
			</xs:element>
			<xs:element name="jiout" type="JioutType"/>
		</xs:sequence>
		<xs:attributeGroup ref="XICommandAttributeGroup"/>
	</xs:complexType>
	
	<xs:complexType name="JictrlinType">
		<xs:choice>
			<xs:element name="MALIST" type="MALISTRequest" />
			<xs:element name="MAPOSTKORB" type="MAPOSTKORBRequest" />
		</xs:choice>
	</xs:complexType>
	
	<xs:complexType name="XICommandType">
		<xs:sequence>
			<xs:element name="jixml">
				<xs:complexType>
					<xs:sequence>
						<xs:element name="jictrlin" type="JictrlinType"/>
					</xs:sequence>
				</xs:complexType>
			</xs:element>
		</xs:sequence>
		<xs:attributeGroup ref="XICommandAttributeGroup"/>
	</xs:complexType>
	
	<xs:complexType name="XIHeaderType">
        <xs:sequence>
            <xs:element name="RequestId" type="timestampType"/>
            <xs:element name="Locale" type="LocaleType"/>
        </xs:sequence>
	</xs:complexType>

	<xs:complexType name="XIDCAType">
		<xs:sequence>
			<xs:element name="XICMD">
				<xs:complexType>
					<xs:attributeGroup ref="XICommandAttributeGroup"/>
					<xs:attribute name="upd" type="timestampType"/>
				</xs:complexType>
			</xs:element>
		</xs:sequence>
	</xs:complexType>
	
<!-- end complex types -->

	<xs:group name="XIResultGroup">
		<xs:sequence>
			<xs:element name="XIDCA" type="XIDCAType"/>
			<xs:element name="XIResult" type="XIResultType"/>
		</xs:sequence>
	</xs:group>

<!-- elements -->
	<xs:element name="XIContainer">
		<xs:complexType>
			<xs:sequence>
				<xs:element name="XIHeader" type="XIHeaderType"/>
				<xs:choice>
					<xs:element name="XICommand" type="XICommandType"/>
					<xs:group ref="XIResultGroup"/>
				</xs:choice>
			</xs:sequence>
		</xs:complexType>
	</xs:element>
<!-- end elements -->
</xs:schema>

As you can see, MAPOSTKORBgetDataEkZeile is based on ZeileType. While ZeileType is rather simple, MAPOSTKORBgetDataEkZeile consists of several elements none of them mandatory. The basic idea behind ZeilenType (and element Zeile) is we use Zeile(nType) for every response, but each response's Zeile may consist of different elements thus it is defined by a different complexType. In this specific case, we want to use MAPOSTKORB's MAPOSTKORBgetDataEkZeile for two response's. Since its elements aren't mandatory this should work, but we get the error mentioned above.

So, what's the problem here? May be a basic, simple explanation of UPA rule is helpfull, I guess I just don't understand this constraint.

[Mike Himstead]

Duh, forget it, there's a duplicate line in the first schema ("Bezeichnung"). After removing the line compilation works.