get nodes for a value of element in that nodes

[karthi...@gmail.com]

Hi,

dont know if this is correct forum to post. kindly ignore if this is wrong place to post. i am in need of help on below libxml2, xpath stuff

i have the below xml file

<?xml version="1.0"?>

<License version="1">

<ActivationInfo>

<ActivationDate></ActivationDate>

<IssueDate>22-Dec-2015</IssueDate>

</ActivationInfo>

<MachineInfo>

<MachineName></MachineName>

<SoftwareIds></SoftwareIds>

</MachineInfo>

<LicenseKeys>

<LicenseKey>

<LicenseVersion>1</LicenseVersion>

<FeatureName>PLI_FEATURE1</FeatureName>

<LicenseType>PERMANENT</LicenseType>

<CustomProperties>

<CustomProperty>

<key>LICENSETYPE</key>

<value>EVAL</value>

</CustomProperty>

<CustomProperty>

<key>CAPACITY</key>

<value>10</value>

</CustomProperty>

<CustomProperty>

<key>CAPACITY_UNIT</key>

<value>TB</value>

</CustomProperty>

</CustomProperties>

</LicenseKey>

<LicenseKey>

<FeatureName>PLI_FEATURE2</FeatureName>  

<LicenseType expirationDate="01-Jan-2017">EVALUATION</LicenseType>

<CustomProperties>

<CustomProperty>

<key>LICENSETYPE</key>

<value>EVAL</value>

</CustomProperty>

<CustomProperty>

<key>CAPACITY</key>

<value>10</value>

</CustomProperty>

<CustomProperty>

<key>CAPACITY_UNIT</key>

<value>TB</value>

</CustomProperty>

</CustomProperties>

</LicenseKey>

<LicenseKey>

<FeatureName>PLI_FEATURE3</FeatureName>  

<LicenseType>SUBSCRIPTION</LicenseType>      

<CustomProperties>

<CustomProperty>

<key>LICENSETYPE</key>

<value>EVAL</value>

</CustomProperty>

<CustomProperty>

<key>CAPACITY</key>

<value>10</value>

</CustomProperty>

<CustomProperty>

<key>CAPACITY_UNIT</key>

<value>TB</value>

</CustomProperty>

<CustomProperty>

<key>START_DATE</key>

<value>10-Jun-2015</value>

</CustomProperty>

<CustomProperty>

<key>END_DATE</key>

<value>09-Jun-2016</value>

</CustomProperty>

<CustomProperty>

<key>GRACE_PERIOD</key>

<value>23-Jun-2016</value>

</CustomProperty>

</CustomProperties>

</LicenseKey>

</LicenseKeys>

</License>

i need to generate a set of sub nodes/ elements as output for every FeatureName we pass as input.

Example, if we pass PLI_FEATURE3 as input, the output should be set of node where this feature name is present. here it should display the last <LicenseKey>...</LicenseKeys> complete information.

Please help me to get this output. attached is the sample xml.

Thanks