How to check if an element exists in the xml using xpath

Question

Below is my element hierarchy  How to check  using xpath  that AttachedXml element is present under CreditReport of Primary Consumer   lt Consumers xmlns  http   xml mycompany com XMLSchema  gt          lt Consumer subjectIdentifier  Primary  gt             lt DataSources gt                  lt Credit gt                      lt CreditReport gt                         lt AttachedXml gt  lt   CDATA  blah blah   gt

User · Answer

take look at my example    lt tocheading language  EN  gt         lt subj-group gt             lt subject gt Editors Choice lt  subject gt             lt subject gt creative common lt  subject gt         lt  subj-group gt    lt  tocheading gt     now how to check if creative common is exist   tocheading subj-group subject text      creative common    hope this help you

User · Answer

The Saxon documentation  though a little unclear  seems to suggest that the JAXP XPath API will return false when evaluating an XPath expression if no matching nodes are found   This IBM article mentions a return value of null when no nodes are matched   You might need to play around with the return types a bit based on this API  but the basic idea is that you just run a normal XPath and check whether the result is a node   false   null   etc   XPathFactory xpathFactory   XPathFactory newInstance NamespaceConstant OBJECT MODEL SAXON   XPath xpath   xpathFactory newXPath    XPathExpression expr   xpath compile   Consumers Consumer DataSources Credit CreditReport AttachedXml    Object result   expr evaluate doc  XPathConstants NODE    if   result    null            do something

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If boolean   is not available  the tool I m using does not  one way to achieve it is     SELECT  id  xpto   OPTION not not  selected      In this case  within the  OPTION  one of the options is the selected one  The  selected  does not have a value    it just exists  while the other OPTION do not have  selected   This achieves the objective

User · Answer

Normally when you try to select a node using xpath your xpath-engine will return null or equivalent if the node doesn t exists    xpath    Consumers Consumer DataSources Credit CreditReport AttachedXml    If your using xsl check out this question for an answer   xpath find if node exists

User · Answer

Use the boolean   XPath function       The boolean function converts its   argument to a boolean as follows          a number is true if and only if   it is neither positive or negative   zero nor NaN   a node-set is true if and only if   it is non-empty   a string is true if and only if   its length is non-zero   an object of a type other than   the four basic types is converted to a   boolean in a way that is dependent on   that type      If there is an AttachedXml in the CreditReport of primary Consumer  then it will return true     boolean  mc Consumers            mc Consumer  subjectIdentifier  Primary                 mc CreditReport mc AttachedXml

User · Answer

Use   boolean       subjectIdentifier  Primary                                       name    AttachedXml                             and                              namespace-uri    http   xml mycompany com XMLSchema

[xml] How to check if an element exists in the xml using xpath?

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