Problem retrieving a list of values with XPATH

Question

Hi,
I am trying to get a list of all 'Fields' (under the SubscriptionList -> EconomicIndicator -> Code) which have 'Provider' =DJ.
I am using the below xpath expression. But It is not working. I tried other variations but none of them return mulitple items.
Can some one please tell me if Iam missing something.
               XPathExpression xPathExpression= xpath.compile("/SubscriptionList/EconomicIndicator[*]/Code[Provider=DJ]/Fields");
               NodeList result = (NodeList)xPathExpression.evaluate(doc, XPathConstants.NODESET);
          for (int i = 0; i < result.getLength(); i++) {
               Element element = (Element)result.item(i);
          System.out.println(element.getNodeValue());
<?xml version="1.0" encoding="UTF-8"?>
<SubscriptionList>
<DefaultEconomicIndicatorName>US ADP Employment Change</DefaultEconomicIndicatorName>
<!--GE IFO - Business Climate-->
<EconomicIndicator>
<Name>GE IFO - Business Climate</Name>
<Active>0</Active>
<OutputFormat></OutputFormat>
<OutputUnits>1</OutputUnits>
<StartDate>2007-06-22T03:50:00</StartDate>
<EndDate>2007-06-22T04:10:00</EndDate>
<Code>
<Provider>BB</Provider>
<Service>Index</Service>
<InstrumentCode>GRIFPBUS</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB1</Provider>
<Service>Index</Service>
<InstrumentCode>GRIFPBUS</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB2</Provider>
<Service>Index</Service>
<InstrumentCode>GRIFPBUS</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB3</Provider>
<Service>Index</Service>
<InstrumentCode>GRIFPBUS</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>RFA</Provider>
<Service>IDN_SELECTFEED</Service>
<InstrumentCode>DEBUSS=ECI</InstrumentCode>
<FID>356</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>DJ</Provider>
<Service></Service>
<InstrumentCode>GM_IFO</InstrumentCode>
<FID></FID>
<Units>1</Units>
<Fields>GM_IFO_BUSSENTIMENT_Cur</Fields>
</Code>
<Code>
<Provider>DJS</Provider>
<Service></Service>
<InstrumentCode>GM_IFO</InstrumentCode>
<FID></FID>
<Units>1</Units>
<Fields>GM_IFO_BUSSENTIMENT_Cur</Fields>
</Code>
</EconomicIndicator>
<!--GE Producer Prices (MoM)-->
<EconomicIndicator>
<Name>GE Producer Prices (MoM)</Name>
<Active>0</Active>
<OutputFormat></OutputFormat>
<OutputUnits>1</OutputUnits>
<StartDate>2007-06-20T01:50:00</StartDate>
<EndDate>2007-06-20T02:10:00</EndDate>
<Code>
<Provider>BB</Provider>
<Service>Index</Service>
<InstrumentCode>GRPFIMOM</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB1</Provider>
<Service>Index</Service>
<InstrumentCode>GRPFIMOM</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB2</Provider>
<Service>Index</Service>
<InstrumentCode>GRPFIMOM</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB3</Provider>
<Service>Index</Service>
<InstrumentCode>GRPFIMOM</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>RFA</Provider>
<Service>IDN_SELECTFEED</Service>
<InstrumentCode>DEPPI=ECI</InstrumentCode>
<FID>356</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
</EconomicIndicator>
<!--UK CBI Industrial Trend-->
<EconomicIndicator>
<Name>UK CBI Trends - Orders</Name>
<Active>0</Active>
<OutputFormat></OutputFormat>
<OutputUnits>1</OutputUnits>
<StartDate>2007-06-21T05:50:00</StartDate>
<EndDate>2007-06-21T06:10:00</EndDate>
<Code>
<Provider>RFA</Provider>
<Service>IDN_SELECTFEED</Service>
<InstrumentCode>GBCBIO=ECI</InstrumentCode>
<FID>356</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
</EconomicIndicator>
<!--UK CBI Industrial Trend-->
<EconomicIndicator>
<Name>UK CBI Distributive - Trades</Name>
<Active>0</Active>
<OutputFormat></OutputFormat>
<OutputUnits>1</OutputUnits>
<StartDate>2007-06-21T05:50:00</StartDate>
<EndDate>2007-06-21T06:10:00</EndDate>
<Code>
<Provider>RFA</Provider>
<Service>IDN_SELECTFEED</Service>
<InstrumentCode>GBCBIS=ECI</InstrumentCode>
<FID>356</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
</EconomicIndicator>
<!--US Unit Labor Costs-->
<EconomicIndicator>
<Name>US Unit Labor Costs</Name>
<Active>0</Active>
<OutputFormat></OutputFormat>
<OutputUnits>1</OutputUnits>
<StartDate>2007-09-06T08:20:00</StartDate>
<EndDate>2007-09-06T08:40:00</EndDate>
<Code>
<Provider>BB</Provider>
<Service>Index</Service>
<InstrumentCode>COSTNFR%</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB1</Provider>
<Service>Index</Service>
<InstrumentCode>COSTNFR%</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB2</Provider>
<Service>Index</Service>
<InstrumentCode>COSTNFR%</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>BB3</Provider>
<Service>Index</Service>
<InstrumentCode>COSTNFR%</InstrumentCode>
<FID>PX_LAST</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>RFA</Provider>
<Service>IDN_SELECTFEED</Service>
<InstrumentCode>USLCTS=ECI</InstrumentCode>
<FID>356</FID>
<Units>1</Units>
<Fields></Fields>
</Code>
<Code>
<Provider>DJ</Provider>
<Service></Service>
<InstrumentCode>US_PROD2_REV</InstrumentCode>
<FID></FID>
<Units>1</Units>
<Fields>US_PROD2_REV_UNITLABORCOST_CurQChgPct</Fields>
</Code>
<Code>
<Provider>DJS</Provider>
<Service></Service>
<InstrumentCode>US_PROD2_REV</InstrumentCode>
<FID></FID>
<Units>1</Units>
<Fields>US_PROD2_REV_UNITLABORCOST_CurQChgPct</Fields>
</Code>
</EconomicIndicator>
</SubscriptionList>

Answer 1

Hi DrClap,
I have a similar problem again. This time I am trying to extract a list of values from a xsd. Below is the code that I am using.
          try{
               djxsd = new FileInputStream("djei-3.1.xsd");
               XPathFactory factory = XPathFactory.newInstance();
               XPath xpath = factory.newXPath();
               SimpleNamespaceContext nsContext = new SimpleNamespaceContext();
               xpath.setNamespaceContext(nsContext);
               nsContext.addNamespace("xs", "http://www.w3.org/2001/XMLSchema");
               nsContext.addNamespace("xsi","http://www.w3.org/2001/XMLSchema-instance");
               +//String exp = "//xs:element/@name/text()";+               
String exp = "/xs:schema/xs:group/xs:sequence/xs:element";
               XPathExpression xPathExpression= xpath.compile(exp);
               NodeList result = (NodeList)xPathExpression.evaluate(doc, XPathConstants.NODESET);
               FileOutputStream outputfile = new FileOutputStream("log.txt");
          for (int i = 0; i < result.getLength(); i++) {
               Element element = (Element)result.item(i);
               String output = element.getTextContent().trim();
               if(output.length() > 0)
                    outputfile.write(output.getBytes());
                    //System.out.println(output);
Highlighted in Itlalics is the actual expression that I want to use. For some reason this is not working .. it returns nothing.
The other expression works. Please let me know if there is anything wrong with the expression.
THE XSD FILE
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" elementFormDefault="qualified">
     <xs:element name="DJEconomicIndicator">
          <xs:complexType>
               <xs:sequence minOccurs="0" maxOccurs="unbounded">
                    <xs:group ref="allgroup"/>
               </xs:sequence>
               <xs:attributeGroup ref="TopGrp-Attributes"/>
          </xs:complexType>
     </xs:element>
     <xs:group name="allgroup">
          <xs:sequence>
               <!-- ==================== CPI ========================== -->
               <xs:element name="US_CPI_CurMonChgPct" minOccurs="0">
                    <xs:annotation>
                         <xs:documentation> US Consumer Price Index </xs:documentation>
                         <xs:appinfo> CPI </xs:appinfo>
                    </xs:annotation>
                    <xs:complexType>
                         <xs:annotation>
                              <xs:appinfo> MoM Pct Change (Current Period) </xs:appinfo>
                         </xs:annotation>
                         <xs:simpleContent>
                              <xs:extension base="xs:double">
                                   <xs:attributeGroup ref="common-month"/>
                                   <xs:attributeGroup ref="common-attributes"/>
                              </xs:extension>
                         </xs:simpleContent>
                    </xs:complexType>
               </xs:element>
               <xs:element name="US_CPI_ExpMonChgPct" minOccurs="0">
                    <xs:annotation>
                         <xs:documentation> US Consumer Price Index </xs:documentation>
                         <xs:appinfo> CPI </xs:appinfo>
                    </xs:annotation>
                    <xs:complexType>
                         <xs:annotation>
                              <xs:appinfo> Forecast MoM Pct Change (Current Period) </xs:appinfo>
                         </xs:annotation>
                         <xs:simpleContent>
                              <xs:extension base="xs:double">
                                   <xs:attributeGroup ref="common-month"/>
                                   <xs:attributeGroup ref="common-attributes"/>
                              </xs:extension>
                         </xs:simpleContent>
                    </xs:complexType>
               </xs:element>
               <!-- ==================CPI Unrounded==================== -->
               <xs:element name="US_CPI_Unrounded_CurMonChgPct" minOccurs="0">
                    <xs:annotation>
                         <xs:documentation> US Consumer Price Index </xs:documentation>
                         <xs:appinfo> CPI UnRounded</xs:appinfo>
                    </xs:annotation>
                    <xs:complexType>
                         <xs:annotation>
                              <xs:appinfo> MoM Pct Change (Current Period) </xs:appinfo>
                         </xs:annotation>
                         <xs:simpleContent>
                              <xs:extension base="xs:double">
                                   <xs:attributeGroup ref="common-month"/>
                                   <xs:attributeGroup ref="common-attributes"/>
                              </xs:extension>
                         </xs:simpleContent>
                    </xs:complexType>
               </xs:element>
               <!-- ==================CPI Core Index==================== -->
               <xs:element name="US_CPI_Core_CurMonChgPct" minOccurs="0">
                    <xs:annotation>
                         <xs:documentation> US Consumer Price Index </xs:documentation>
                         <xs:appinfo> CPI Core </xs:appinfo>
                    </xs:annotation>
                    <xs:complexType>
                         <xs:annotation>
                              <xs:appinfo> MoM Pct Change (Current Period) </xs:appinfo>
                         </xs:annotation>
                         <xs:simpleContent>
                              <xs:extension base="xs:double">
                                   <xs:attributeGroup ref="common-month"/>
                                   <xs:attributeGroup ref="common-attributes"/>
                              </xs:extension>
                         </xs:simpleContent>
                    </xs:complexType>
               </xs:element>
               <xs:element name="US_CPI_Core_ExpMonChgPct" minOccurs="0">
                    <xs:annotation>
                         <xs:documentation> US Consumer Price Index </xs:documentation>
                         <xs:appinfo> CPI Core </xs:appinfo>
                    </xs:annotation>
                    <xs:complexType>
                         <xs:annotation>
                              <xs:appinfo> Forecast MoM Pct Change (Current Period) </xs:appinfo>
                         </xs:annotation>
                         <xs:simpleContent>
                              <xs:extension base="xs:double">
                                   <xs:attributeGroup ref="common-month"/>
                                   <xs:attributeGroup ref="common-attributes"/>
                              </xs:extension>
                         </xs:simpleContent>
                    </xs:complexType>
               </xs:element>