Jasper Report how to get a sibling node with parameter of another sibling? - xpath

Question

I am working on a new Jaspert Report. It should print all data of a xml text.
The xml text looks like this:
<?xml version="1.0" encoding="ISO-8859-1"?>
<invoice:invoiceMessage>
<invoice>
<invoiceIdentification></invoiceIdentification>
<seller>
<address>
<name></name>
<city></city>
<cityCode></cityCode>
</address>
</seller>
</invoice>
</invoice:invoiceMessage>
And the Jasper Report looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 7.1.0.final using JasperReports Library version 6.4.3 -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="main_report_xml1" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="24a4119c-6e8f-4411-bbb5-c069ab379330">
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Sample DB"/>
<property name="ireport.jasperserver.url" value="http://10.100.10.236/jasperserver-pro/"/>
<property name="ireport.jasperserver.user" value="reko"/>
<property name="ireport.jasperserver.reportUnit" value="/Reko/main_report_xml1"/>
<subDataset name="pageHeader" uuid="cf87fcbb-cbcd-4c3b-bf87-3cf147854adb">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Sample DB"/>
<queryString language="xPath">
<![CDATA[//seller/address]]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.xpath.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="streetAdressOne" class="java.lang.String">
<property name="net.sf.jasperreports.xpath.field.expression" value="streetAdressOne"/>
<fieldDescription><![CDATA[streetAdressOne]]></fieldDescription>
</field>
<field name="cityCode" class="java.lang.String">
<property name="net.sf.jasperreports.xpath.field.expression" value="cityCode"/>
<fieldDescription><![CDATA[cityCode]]></fieldDescription>
</field>
<field name="city" class="java.lang.String">
<property name="net.sf.jasperreports.xpath.field.expression" value="city"/>
<fieldDescription><![CDATA[city]]></fieldDescription>
</field>
</subDataset>
<parameter name="xmlString" class="java.lang.String" isForPrompting="false">
<defaultValueExpression><![CDATA[xmlText]]></defaultValueExpression>
</parameter>
<parameter name="XML_INPUT_STREAM" class="java.io.InputStream">
<defaultValueExpression><![CDATA[new java.io.ByteArrayInputStream($P{xmlString}.getBytes("ISO-8859-1"))]]></defaultValueExpression>
</parameter>
<queryString language="xPath">
<![CDATA[/invoiceMessage/invoice[invoiceIdentification/entityIdentification=9000009029]]]>
</queryString>
<field name="value" class="java.lang.String">
<fieldDescription><![CDATA[creationDateTime]]></fieldDescription>
</field>
<pageHeader>
<band height="38"/>
</pageHeader>
<columnHeader>
<band height="31" splitType="Stretch"/>
</columnHeader>
<detail>
<band height="488" splitType="Stretch">
<componentElement>
<reportElement positionType="Float" stretchType="RelativeToTallestObject" x="0" y="21" width="552" height="30" isRemoveLineWhenBlank="true" uuid="fc7d22c7-8c60-4ecb-974f-c842becc4bf7"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="pageHeader" uuid="1e20fa2b-bb3a-475f-b721-5a13d3c374eb">
<datasetParameter name="XML_DATE_PATTERN">
<datasetParameterExpression><![CDATA[$P{XML_DATE_PATTERN}]]></datasetParameterExpression>
</datasetParameter>
<datasetParameter name="XML_NUMBER_PATTERN">
<datasetParameterExpression><![CDATA[$P{XML_NUMBER_PATTERN}]]></datasetParameterExpression>
</datasetParameter>
<datasetParameter name="XML_LOCALE">
<datasetParameterExpression><![CDATA[$P{XML_LOCALE}]]></datasetParameterExpression>
</datasetParameter>
<datasetParameter name="XML_TIME_ZONE">
<datasetParameterExpression><![CDATA[$P{XML_TIME_ZONE}]]></datasetParameterExpression>
</datasetParameter>
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JRXmlDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("//*[entityIdentification=9000009029]/parent::*/seller")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30">
<textField isStretchWithOverflow="true">
<reportElement stretchType="RelativeToTallestObject" x="0" y="0" width="552" height="15" uuid="eac696b9-e20f-48a3-b70d-b186f5e649d6"/>
<textFieldExpression><![CDATA[$F{name}]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
My question is:
What should my dataSourceExpression in the componentElement be, so I can get the data out of it?
I also have some data in the invoice node that I need to show and thats why i set it like this in the query string. And I need to filter by the parameter that is stored inside of invoiceIdentification node.