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Reading a value from XML with namespaces

Posted on 2011-09-13
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Last Modified: 2012-05-12
HI
I have a document with the following root :
<xxx:Envelope xxx:version="yyy">

How do I get the version attribute value from java code ?

Thanks
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Question by:elimesika
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by:for_yan
ID: 36533572
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by:elimesika
ID: 36533581
hi
Thanks for the quick respond , but I didn't found in your example how to get a value that is prefixed by a namespace (xxx:version)  
Please elaborate

Thanks
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by:elimesika
ID: 36533587
also , I would like to get the value with XPATH and not by loping all nodes ....
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by:for_yan
ID: 36533626
Can you post an example of the actual file you want to read ?
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by:elimesika
ID: 36533675
HI
Here it is
I want to get the ovf:version value

Thanks
<?xml version='1.0' encoding='UTF-8'?><ovf:Envelope xmlns:ovf="http://schemas.dmtf.org/ovf/envelope/1/" xmlns:rasd="http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_ResourceAllocationSettingData" xmlns:vssd="http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_VirtualSystemSettingData" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ovf:version="1.0"><References><File ovf:href="f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff" ovf:id="5ee9b198-ba30-44d2-8304-5abe331dc3ff" ovf:size="0" ovf:description="_Master_01/06/2010 17:36:05_template" /></References><Section xsi:type="ovf:NetworkSection_Type"><Info>List of networks</Info><Network ovf:name="Network 1" /></Section><Section xsi:type="ovf:DiskSection_Type"><Info>List of Virtual Disks</Info><Disk ovf:diskId="5ee9b198-ba30-44d2-8304-5abe331dc3ff" ovf:size="0" ovf:actual_size="0" ovf:vm_snapshot_id="dcd8f3a3-4f3b-4727-b2e6-b8e9ec5804d1" ovf:parentRef="" ovf:fileRef="f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff" ovf:format="http://www.vmware.com/specifications/vmdk.html#sparse" ovf:volume-format="RAW" ovf:volume-type="Sparse" ovf:disk-interface="IDE" ovf:disk-type="System" ovf:boot="true" ovf:wipe-after-delete="false" /></Section><Content ovf:id="out" xsi:type="ovf:VirtualSystem_Type"><Name>Master</Name><TemplateId>a36a7ea2-d434-45cb-b32f-7a6c269c97ea</TemplateId><Description></Description><Domain></Domain><CreationDate>2010/06/01 02:36:00</CreationDate><IsAutoSuspend>false</IsAutoSuspend><TimeZone>Israel Standard Time</TimeZone><VmType>0</VmType><default_display_type>0</default_display_type><default_boot_sequence>0</default_boot_sequence><Section ovf:id="a36a7ea2-d434-45cb-b32f-7a6c269c97ea" ovf:required="false" xsi:type="ovf:OperatingSystemSection_Type"><Info>Guest Operating System</Info><Description>WindowsXP</Description></Section><Section xsi:type="ovf:VirtualHardwareSection_Type"><Info>1 CPU, 512 Memeory</Info><System><vssd:VirtualSystemType>XXXX 2.3.0.0</vssd:VirtualSystemType></System><Item><rasd:Caption>1 virtual cpu</rasd:Caption><rasd:Description>Number of virtual CPU</rasd:Description><rasd:InstanceId>1</rasd:InstanceId><rasd:ResourceType>3</rasd:ResourceType><rasd:num_of_sockets>1</rasd:num_of_sockets><rasd:cpu_per_socket>1</rasd:cpu_per_socket></Item><Item><rasd:Caption>512 MB of memory</rasd:Caption><rasd:Description>Memory Size</rasd:Description><rasd:InstanceId>2</rasd:InstanceId><rasd:ResourceType>4</rasd:ResourceType><rasd:AllocationUnits>MegaBytes</rasd:AllocationUnits><rasd:VirtualQuantity>512</rasd:VirtualQuantity></Item><Item><rasd:Caption>Drive 1</rasd:Caption><rasd:InstanceId>5ee9b198-ba30-44d2-8304-5abe331dc3ff</rasd:InstanceId><rasd:ResourceType>17</rasd:ResourceType><rasd:HostResource>f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff</rasd:HostResource><rasd:Parent>00000000-0000-0000-0000-000000000000</rasd:Parent><rasd:Template>00000000-0000-0000-0000-000000000000</rasd:Template><rasd:ApplicationList></rasd:ApplicationList><rasd:StorageId>875bd4ea-88e2-440f-b5cb-2fc1efa3bb60</rasd:StorageId><rasd:StoragePoolId>106a6029-f6f0-4a5d-bb35-82d6b6448420</rasd:StoragePoolId><rasd:CreationDate>2010/06/01 11:25:50</rasd:CreationDate><rasd:LastModified>2010/06/01 11:25:50</rasd:LastModified></Item><Item><rasd:Caption>Ethernet adapter on xxxx</rasd:Caption><rasd:InstanceId>3</rasd:InstanceId><rasd:ResourceType>10</rasd:ResourceType><rasd:ResourceSubType>0</rasd:ResourceSubType><rasd:Connection>xxxx</rasd:Connection><rasd:Name>ddd</rasd:Name><rasd:speed>1000</rasd:speed></Item><Item><rasd:Caption>Ethernet adapter on xxxx</rasd:Caption><rasd:InstanceId>4</rasd:InstanceId><rasd:ResourceType>10</rasd:ResourceType><rasd:ResourceSubType>2</rasd:ResourceSubType><rasd:Connection>xxxx</rasd:Connection><rasd:Name>eth0</rasd:Name><rasd:speed>1000</rasd:speed></Item><Item><rasd:Caption>USB Controller</rasd:Caption><rasd:InstanceId>5</rasd:InstanceId><rasd:ResourceType>23</rasd:ResourceType><rasd:UsbPolicy>Enabled</rasd:UsbPolicy></Item><Item><rasd:Caption>Graphical Controller</rasd:Caption><rasd:InstanceId>6</rasd:InstanceId><rasd:ResourceType>20</rasd:ResourceType><rasd:VirtualQuantity>1</rasd:VirtualQuantity></Item></Section></Content></ovf:Envelope>

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by:for_yan
ID: 36533723
Don't know if this is what you want:

    String xmlData1 =    "<?xml version='1.0' encoding='UTF-8'?><ovf:Envelope xmlns:ovf=\"http://schemas.dmtf.org/ovf/envelope/1/\" xmlns:rasd=\"http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_ResourceAllocationSettingData\" " +
                "xmlns:vssd=\"http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_VirtualSystemSettingData\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" " +
                "ovf:version=\"1.0\"><References><File ovf:href=\"f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff\" ovf:id=\"5ee9b198-ba30-44d2-8304-5abe331dc3ff\" " +
                "ovf:size=\"0\" ovf:description=\"_Master_01/06/2010 17:36:05_template\" /></References><Section xsi:type=\"ovf:NetworkSection_Type\">" +
                "<Info>List of networks</Info><Network ovf:name=\"Network 1\" /></Section><Section xsi:type=\"ovf:DiskSection_Type\"><Info>List of Virtual Disks</Info>" +
                "<Disk ovf:diskId=\"5ee9b198-ba30-44d2-8304-5abe331dc3ff\" ovf:size=\"0\" ovf:actual_size=\"0\" ovf:vm_snapshot_id=\"dcd8f3a3-4f3b-4727-b2e6-b8e9ec5804d1\" ovf:parentRef=\"\"" +
                " ovf:fileRef=\"f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff\" ovf:format=\"http://www.vmware.com/specifications/vmdk.html#sparse\"" +
                " ovf:volume-format=\"RAW\" ovf:volume-type=\"Sparse\" ovf:disk-interface=\"IDE\" ovf:disk-type=\"System\" ovf:boot=\"true\" " +
                "ovf:wipe-after-delete=\"false\" /></Section><Content ovf:id=\"out\" xsi:type=\"ovf:VirtualSystem_Type\"><Name>Master</Name>" +
                "<TemplateId>a36a7ea2-d434-45cb-b32f-7a6c269c97ea</TemplateId><Description></Description><Domain>" +
                "</Domain><CreationDate>2010/06/01 02:36:00</CreationDate><IsAutoSuspend>false</IsAutoSuspend>" +
                "<TimeZone>Israel Standard Time</TimeZone><VmType>0</VmType><default_display_type>0</default_display_type>" +
                "<default_boot_sequence>0</default_boot_sequence><Section ovf:id=\"a36a7ea2-d434-45cb-b32f-7a6c269c97ea\" ovf:required=\"false\" xsi:type=\"ovf:OperatingSystemSection_Type\">" +
                "<Info>Guest Operating System</Info><Description>WindowsXP</Description>" +
                "</Section><Section xsi:type=\"ovf:VirtualHardwareSection_Type\">" +
                "<Info>1 CPU, 512 Memeory</Info><System><vssd:VirtualSystemType>XXXX 2.3.0.0</vssd:VirtualSystemType>" +
                "</System><Item><rasd:Caption>1 virtual cpu</rasd:Caption><rasd:Description>Number of virtual CPU</rasd:Description>" +
                "<rasd:InstanceId>1</rasd:InstanceId><rasd:ResourceType>3</rasd:ResourceType><rasd:num_of_sockets>1</rasd:num_of_sockets>" +
                "<rasd:cpu_per_socket>1</rasd:cpu_per_socket></Item><Item><rasd:Caption>512 MB of memory</rasd:Caption>" +
                "<rasd:Description>Memory Size</rasd:Description>" +
                "<rasd:InstanceId>2</rasd:InstanceId><rasd:ResourceType>4</rasd:ResourceType><rasd:AllocationUnits>MegaBytes</rasd:AllocationUnits>" +
                "<rasd:VirtualQuantity>512</rasd:VirtualQuantity></Item><Item><rasd:Caption>Drive 1</rasd:Caption>" +
                "<rasd:InstanceId>5ee9b198-ba30-44d2-8304-5abe331dc3ff</rasd:InstanceId><rasd:ResourceType>17</rasd:ResourceType>" +
                "<rasd:HostResource>f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff</rasd:HostResource>" +
                "<rasd:Parent>00000000-0000-0000-0000-000000000000</rasd:Parent>" +
                "<rasd:Template>00000000-0000-0000-0000-000000000000</rasd:Template>" +
                "<rasd:ApplicationList></rasd:ApplicationList><rasd:StorageId>875bd4ea-88e2-440f-b5cb-2fc1efa3bb60</rasd:StorageId>" +
                "<rasd:StoragePoolId>106a6029-f6f0-4a5d-bb35-82d6b6448420</rasd:StoragePoolId>" +
                "<rasd:CreationDate>2010/06/01 11:25:50</rasd:CreationDate><rasd:LastModified>2010/06/01 11:25:50</rasd:LastModified>" +
                "</Item><Item><rasd:Caption>Ethernet adapter on xxxx</rasd:Caption><rasd:InstanceId>3</rasd:InstanceId>" +
                "<rasd:ResourceType>10</rasd:ResourceType><rasd:ResourceSubType>0</rasd:ResourceSubType><rasd:Connection>xxxx</rasd:Connection>" +
                "<rasd:Name>ddd</rasd:Name><rasd:speed>1000</rasd:speed></Item><Item><rasd:Caption>Ethernet adapter on xxxx</rasd:Caption><rasd:InstanceId>4</rasd:InstanceId><rasd:ResourceType>10</rasd:ResourceType><rasd:ResourceSubType>2</rasd:ResourceSubType>" +
                "<rasd:Connection>xxxx</rasd:Connection><rasd:Name>eth0</rasd:Name><rasd:speed>1000</rasd:speed></Item><Item><rasd:Caption>USB Controller</rasd:Caption><rasd:InstanceId>5</rasd:InstanceId><rasd:ResourceType>23</rasd:ResourceType><rasd:UsbPolicy>Enabled</rasd:UsbPolicy>" +
                "</Item><Item><rasd:Caption>Graphical Controller</rasd:Caption><rasd:InstanceId>6</rasd:InstanceId><rasd:ResourceType>20</rasd:ResourceType>" +
                "<rasd:VirtualQuantity>1</rasd:VirtualQuantity></Item></Section></Content></ovf:Envelope>";




        InputSource source = new InputSource(new StringReader(xmlData1));

        XPath xPath = XPathFactory.newInstance().newXPath();

        NodeList list = null;
         NodeList list1 = null;
        try {
            xPath.setNamespaceContext(new NamespaceContext() {
                public String getNamespaceURI(String prefix) {
                    return "http://schemas.dmtf.org/ovf/envelope/1/";
                }
                public String getPrefix(String namespaceURI) {
                    return "ovf";
                }
                public Iterator getPrefixes(String namespaceURI) {
                    throw new UnsupportedOperationException("Not supported yet.");
                }
            });

   

             list = (NodeList) xPath.evaluate("//ovf:Envelope",  source, XPathConstants.NODESET);


        } catch (Exception ex) {
            System.out.println(ex.getMessage());
            ex.printStackTrace();
        }
        for (int i = 0; i < list.getLength(); i++) {
            NamedNodeMap atr =  list.item(i).getAttributes();
            for(int j=0; j<atr.getLength(); j++){
                System.out.println(atr.item(j).getNodeName());
                  System.out.println(atr.item(j).getNodeValue());
                  System.out.println(atr.item(j).getNamespaceURI());
            }
            
           // System.out.println(atr);
            
            System.out.println(list.item(i).getTextContent());
        }


        

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Output:

ovf:version
1.0
http://schemas.dmtf.org/ovf/envelope/1/
xmlns:ovf
http://schemas.dmtf.org/ovf/envelope/1/
http://www.w3.org/2000/xmlns/
xmlns:rasd
http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_ResourceAllocationSettingData
http://www.w3.org/2000/xmlns/
xmlns:vssd
http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_VirtualSystemSettingData
http://www.w3.org/2000/xmlns/
xmlns:xsi
http://www.w3.org/2001/XMLSchema-instance
http://www.w3.org/2000/xmlns/
List of networksList of Virtual DisksMastera36a7ea2-d434-45cb-b32f-7a6c269c97ea2010/06/01 02:36:00falseIsrael Standard Time000Guest Operating SystemWindowsXP1 CPU, 512 MemeoryXXXX 2.3.0.01 virtual cpuNumber of virtual CPU1311512 MB of memoryMemory Size24MegaBytes512Drive 15ee9b198-ba30-44d2-8304-5abe331dc3ff17f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff00000000-0000-0000-0000-00000000000000000000-0000-0000-0000-000000000000875bd4ea-88e2-440f-b5cb-2fc1efa3bb60106a6029-f6f0-4a5d-bb35-82d6b64484202010/06/01 11:25:502010/06/01 11:25:50Ethernet adapter on xxxx3100xxxxddd1000Ethernet adapter on xxxx4102xxxxeth01000USB Controller523EnabledGraphical Controller6201

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Author Comment

by:elimesika
ID: 36533731
HI

Thanks again

If I want the output  to be only "1.0" (the value of ovf:version in the document)
Is there a direct way to access this value in XPATH without looping all notes ?
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Expert Comment

by:for_yan
ID: 36533741
    String xmlData1 =    "<?xml version='1.0' encoding='UTF-8'?><ovf:Envelope xmlns:ovf=\"http://schemas.dmtf.org/ovf/envelope/1/\" xmlns:rasd=\"http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_ResourceAllocationSettingData\" " +
                "xmlns:vssd=\"http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_VirtualSystemSettingData\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" " +
                "ovf:version=\"1.0\"><References><File ovf:href=\"f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff\" ovf:id=\"5ee9b198-ba30-44d2-8304-5abe331dc3ff\" " +
                "ovf:size=\"0\" ovf:description=\"_Master_01/06/2010 17:36:05_template\" /></References><Section xsi:type=\"ovf:NetworkSection_Type\">" +
                "<Info>List of networks</Info><Network ovf:name=\"Network 1\" /></Section><Section xsi:type=\"ovf:DiskSection_Type\"><Info>List of Virtual Disks</Info>" +
                "<Disk ovf:diskId=\"5ee9b198-ba30-44d2-8304-5abe331dc3ff\" ovf:size=\"0\" ovf:actual_size=\"0\" ovf:vm_snapshot_id=\"dcd8f3a3-4f3b-4727-b2e6-b8e9ec5804d1\" ovf:parentRef=\"\"" +
                " ovf:fileRef=\"f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff\" ovf:format=\"http://www.vmware.com/specifications/vmdk.html#sparse\"" +
                " ovf:volume-format=\"RAW\" ovf:volume-type=\"Sparse\" ovf:disk-interface=\"IDE\" ovf:disk-type=\"System\" ovf:boot=\"true\" " +
                "ovf:wipe-after-delete=\"false\" /></Section><Content ovf:id=\"out\" xsi:type=\"ovf:VirtualSystem_Type\"><Name>Master</Name>" +
                "<TemplateId>a36a7ea2-d434-45cb-b32f-7a6c269c97ea</TemplateId><Description></Description><Domain>" +
                "</Domain><CreationDate>2010/06/01 02:36:00</CreationDate><IsAutoSuspend>false</IsAutoSuspend>" +
                "<TimeZone>Israel Standard Time</TimeZone><VmType>0</VmType><default_display_type>0</default_display_type>" +
                "<default_boot_sequence>0</default_boot_sequence><Section ovf:id=\"a36a7ea2-d434-45cb-b32f-7a6c269c97ea\" ovf:required=\"false\" xsi:type=\"ovf:OperatingSystemSection_Type\">" +
                "<Info>Guest Operating System</Info><Description>WindowsXP</Description>" +
                "</Section><Section xsi:type=\"ovf:VirtualHardwareSection_Type\">" +
                "<Info>1 CPU, 512 Memeory</Info><System><vssd:VirtualSystemType>XXXX 2.3.0.0</vssd:VirtualSystemType>" +
                "</System><Item><rasd:Caption>1 virtual cpu</rasd:Caption><rasd:Description>Number of virtual CPU</rasd:Description>" +
                "<rasd:InstanceId>1</rasd:InstanceId><rasd:ResourceType>3</rasd:ResourceType><rasd:num_of_sockets>1</rasd:num_of_sockets>" +
                "<rasd:cpu_per_socket>1</rasd:cpu_per_socket></Item><Item><rasd:Caption>512 MB of memory</rasd:Caption>" +
                "<rasd:Description>Memory Size</rasd:Description>" +
                "<rasd:InstanceId>2</rasd:InstanceId><rasd:ResourceType>4</rasd:ResourceType><rasd:AllocationUnits>MegaBytes</rasd:AllocationUnits>" +
                "<rasd:VirtualQuantity>512</rasd:VirtualQuantity></Item><Item><rasd:Caption>Drive 1</rasd:Caption>" +
                "<rasd:InstanceId>5ee9b198-ba30-44d2-8304-5abe331dc3ff</rasd:InstanceId><rasd:ResourceType>17</rasd:ResourceType>" +
                "<rasd:HostResource>f4448fd6-59ec-4af2-bc13-92cc87bcdb78/5ee9b198-ba30-44d2-8304-5abe331dc3ff</rasd:HostResource>" +
                "<rasd:Parent>00000000-0000-0000-0000-000000000000</rasd:Parent>" +
                "<rasd:Template>00000000-0000-0000-0000-000000000000</rasd:Template>" +
                "<rasd:ApplicationList></rasd:ApplicationList><rasd:StorageId>875bd4ea-88e2-440f-b5cb-2fc1efa3bb60</rasd:StorageId>" +
                "<rasd:StoragePoolId>106a6029-f6f0-4a5d-bb35-82d6b6448420</rasd:StoragePoolId>" +
                "<rasd:CreationDate>2010/06/01 11:25:50</rasd:CreationDate><rasd:LastModified>2010/06/01 11:25:50</rasd:LastModified>" +
                "</Item><Item><rasd:Caption>Ethernet adapter on xxxx</rasd:Caption><rasd:InstanceId>3</rasd:InstanceId>" +
                "<rasd:ResourceType>10</rasd:ResourceType><rasd:ResourceSubType>0</rasd:ResourceSubType><rasd:Connection>xxxx</rasd:Connection>" +
                "<rasd:Name>ddd</rasd:Name><rasd:speed>1000</rasd:speed></Item><Item><rasd:Caption>Ethernet adapter on xxxx</rasd:Caption><rasd:InstanceId>4</rasd:InstanceId><rasd:ResourceType>10</rasd:ResourceType><rasd:ResourceSubType>2</rasd:ResourceSubType>" +
                "<rasd:Connection>xxxx</rasd:Connection><rasd:Name>eth0</rasd:Name><rasd:speed>1000</rasd:speed></Item><Item><rasd:Caption>USB Controller</rasd:Caption><rasd:InstanceId>5</rasd:InstanceId><rasd:ResourceType>23</rasd:ResourceType><rasd:UsbPolicy>Enabled</rasd:UsbPolicy>" +
                "</Item><Item><rasd:Caption>Graphical Controller</rasd:Caption><rasd:InstanceId>6</rasd:InstanceId><rasd:ResourceType>20</rasd:ResourceType>" +
                "<rasd:VirtualQuantity>1</rasd:VirtualQuantity></Item></Section></Content></ovf:Envelope>";




        InputSource source = new InputSource(new StringReader(xmlData1));

        XPath xPath = XPathFactory.newInstance().newXPath();

        NodeList list = null;
         NodeList list1 = null;
        try {
            xPath.setNamespaceContext(new NamespaceContext() {
                public String getNamespaceURI(String prefix) {
                    return "http://schemas.dmtf.org/ovf/envelope/1/";
                }
                public String getPrefix(String namespaceURI) {
                    return "ovf";
                }
                public Iterator getPrefixes(String namespaceURI) {
                    throw new UnsupportedOperationException("Not supported yet.");
                }
            });

       

             list = (NodeList) xPath.evaluate("//ovf:Envelope",  source, XPathConstants.NODESET);


        } catch (Exception ex) {
            System.out.println(ex.getMessage());
            ex.printStackTrace();
        }
        for (int i = 0; i < list.getLength(); i++) {
            NamedNodeMap atr =  list.item(i).getAttributes();
            for(int j=0; j<atr.getLength(); j++){
                if(atr.item(j).getNodeName().indexOf("version") > -1)
                {
                     System.out.println(atr.item(j).getNodeName());
                        System.out.println(atr.item(j).getNodeValue());
                }

       
            }
            
    
        }

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Output:

ovf:version
1.0

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Accepted Solution

by:
mccarl earned 500 total points
ID: 36533853
> If I want the output  to be only "1.0" (the value of ovf:version in the document) Is there a direct way to access this value in XPATH without looping all notes ?

Yes. As above but change line 61 to the following...

String version = xPath.evaluate("/ovf:Envelope/@ovf:version",  source);


... and get rid of everything in the for loop (lines 68 to 81)
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LVL 19

Author Closing Comment

by:elimesika
ID: 36533868
Thanks a lot !!!
0

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