Split XML file with XSLT 2.0 based on element count - java

Huge XML with the following structure :
<?xml version="1.0" encoding="UTF-8"?>
<productall>
<product type="electronics" date="1-1-2016">
<type name"Androidbased">
<product> InStock </product>
</type>
</product>
<product type="cloths" date="1-12-2008">
<type name"Jeans">
<product> InStock </product>
</type>
</product>
<product type="bags" date="1-12-2008">
<type name"FF">
<product> InStock </product>
</type>
</product>
</productall>
each product type has thousands of records for example electronics are 2000 records and cloths are 8000 records.
I want to split this XML file into multiple XMLs with 1000 records each regardless the type!
I have used XSLT 2.0 based on java & saxon 9 to split it but it doesn't work as it should here is what I did so far :
java -jar sax.jar productall.xml split.xslt
Split.xslt
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="productall" select="1000"></xsl:param>
<xsl:template match="/productall/product[#type]">
<xsl:for-each-group select="product" group-adjacent="(position()-1) idiv $productall">
<xsl:result-document href="part.{current-grouping-key()}.xml">
<productall>
<xsl:copy-of select="current-group()"></xsl:copy-of>
</productall>
</xsl:result-document>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>
The result is printed out on the terminal screen without XML format and no .XML files are generated. Don't know what is wrong the command syntax or the contents of the XSLT file?

The main problem here is your template matches a product element, which means when you do the xsl:for-each-group, you will be positioned on the product element. Then you are selecting product elements, ye the these are not children of the current element, but of the type elements. So, you need to do this...
<xsl:for-each-group select="type/product" group-adjacent="(position()-1) idiv $productall">
However, you say you want multiple XMLs with 1000 records each regardless the type, but the current XSLT does this for each main product separately, meaning you will get duplicate file names.
Perhaps you should include the main product type in the file name?
<result-document href="part.{../../#type}.{current-grouping-key()}.xml">
Or if you really did want to do it regardless of main product type, you should change your main template to match productall instead.
Try this XSLT
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="productall" select="1000"></xsl:param>
<xsl:template match="/productall">
<xsl:for-each-group select="product/type/product" group-adjacent="(position()-1) idiv $productall">
<xsl:result-document href="part.{current-grouping-key()}.xml">
<productall>
<xsl:copy-of select="current-group()"></xsl:copy-of>
</productall>
</xsl:result-document>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>

I think you simply need to change match="/productall/product[#type]" to match="/productall".

Related

XSL transformation template returns only the last attribute value

Hello and happy new year to the stack overflow community!
This is my first time working with XSL to transform an xml to another xml format.
Thing is i had this whole thing working(or atleast i thought i did) but the downside is it does not return exactly the same output i expected.
the desired input and out are as follows :
Input.xml
<?xml version="1.0"?>
<TestExecutionSummary>
<ExecutionDate>12-okt-2018 15-43-46</ExecutionDate>
<ExecutedTestCases>3</ExecutedTestCases>
<PassedTestCases>2</PassedTestCases>
<FailedTestCases>1</FailedTestCases>
<TimeTaken>00:03:48</TimeTaken>
<Testcases>
<TestCaseStatus name="TC001" status="PASS"/>
<TestCaseStatus name="TC002" status="PASS"/>
<TestCaseStatus name="TC003" status="FAIL"/>
</Testcases>
</TestExecutionSummary>
The output xml
<?xml version="1.0"?>
<testsuite time="548.000" tests="2" errors="0" skipped="0" failures="1">
<testcase classname="CITS" name="TC001"/>
<testcase classname="CITS" name="TC002"/>
<testcase classname="CITS" name="TC003"/>
<failure type="CITS test failure">unknown failure</failure>
</testsuite>
My XSL template is as follows :
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<xsl:output encoding="utf-8" method="xml" version="1.0" indent="yes"/>
<xsl:template match="/">
<testsuite>
<xsl:attribute name="time"><xsl:value-of select="TestExecutionSummary/TimeTaken"/></xsl:attribute>
<xsl:attribute name="tests"><xsl:value-of select="TestExecutionSummary/ExecutedTestCases"/></xsl:attribute>
<xsl:attribute name="errors">0</xsl:attribute>
<xsl:attribute name="skipped">0</xsl:attribute>
<xsl:attribute name="failures"><xsl:value-of select="TestExecutionSummary/FailedTestCases"/></xsl:attribute>
<testcase>
<xsl:for-each select="TestExecutionSummary/Testcases/TestCaseStatus[#status]">
<xsl:attribute name="classname">CITS</xsl:attribute>
<xsl:attribute name="name"><xsl:value-of select="#name"/></xsl:attribute>
</xsl:for-each>
</testcase>
<failure><xsl:attribute name="type">CITS test failure</xsl:attribute>"unknown error"</failure>
</testsuite>
</xsl:template>
</xsl:stylesheet>
But the weird thing i see is this transformation always gives me back this as result and the full list of tests run. The 'xsl:for-each' should loop through the TestCaseStatus node and list the 'name' attributes i thought. But the result is this :
<testsuite time="00:03:48"
tests="3"
errors="0"
skipped="0"
failures="1">
<testcase classname="CITS" name="TC003"/>
<failure type="CITS test failure">"unknown error"</failure>
</testsuite>
As you can see i get back the test-name TC003 only and not TC001 and TC002, which i why i was wondering what i did wrong back there. I am trying to look into sample XSL templates and some tutorials in the meantime but i did not encounter any case in any forum where users encountered this issue. So can anyone point me out please what i did wrong there? Thanks in advance!
JFYI if needed i can also post how am am using the XSL to do the transformation in groovy but i think that works fine as i tried this input and the template on an online transformation site and i had the same result.
You need to move the creation of <testcase> inside the xsl:for-each, rather than outside. Otherwise you are creating just one <testcase> element and then trying to add multiple attributes to that. (If you attempt to add an attribute to an element that already has that attribute, the attribute gets replaced).
<xsl:for-each select="TestExecutionSummary/Testcases/TestCaseStatus[#status]">
<testcase>
<xsl:attribute name="classname">CITS</xsl:attribute>
<xsl:attribute name="name"><xsl:value-of select="#name"/></xsl:attribute>
</testcase>
</xsl:for-each>
Or better still, do this
<xsl:for-each select="TestExecutionSummary/Testcases/TestCaseStatus[#status]">
<testcase classname="CITS" name="{#name}"/>
</xsl:for-each>
Note the use of Attribute Value Templates to create the name attribute.
I'm afraid, you can not have multiple attributes with the same name in a single element.
Maybe you should prepare a comma separated list and put it as the value of the attribute.

Create xmlns attribute in the XML using XSLT Transformation

I am trying to add the xmlns attribute to the resulting XML with a value passed by parameter during XSLT transformation using JDK Transformer (Oracle XML v2 Parser or JAXP) but it always defaults to http://www.w3.org/2000/xmlns/
My source XML
<test/>
My XSLT
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://example.com">
<xsl:param name="myNameSpace" select="'http://neilghosh.com'"/>
<xsl:template match="/">
<process>
<xsl:attribute name="xmlns:neil">
<xsl:value-of select="$myNameSpace"/>
</xsl:attribute>
</process>
</xsl:template>
</xsl:stylesheet>
My Result
<?xml version="1.0"?>
<process xmlns="http://www.w3.org/2000/xmlns/" xmlns:neil="neilghosh.com">
</process>
My Desired Result
<?xml version="1.0"?>
<process xmlns="http://example.com" xmlns:neil="neilghosh.com">
</process>
Firstly, in the XSLT data model, you don't want to create an attribute node, you want to create a namespace node.
Namespace nodes are usually created automatically: if you create an element or attribute in a particular namespace, the requisite namespace node (and hence, when serialized, the namespace declaration) are added automatically by the processor.
If you want to create a namespace node that isn't necessary (because it's not used in the name of any element or attribute) then in XSLT 2.0 you can use xsl:namespace. If you're stuck with XSLT 1.0 then there's a workaround, that involves creating an element in the relevant namespace and then copying its namespace node:
<xsl:variable name="ns">
<xsl:element name="neil:dummy" namespace="{$param}"/>
</xsl:variable>
<process>
<xsl:copy-of select="$ns/*/namespace::neil"/>
</process>
Michael Kay provided you with the correct answer, but based on your comments, you aren't sure how to use it in your transformation.
Here is a complete transformation:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ext="http://exslt.org/common" exclude-result-prefixes="ext">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:param name="pNamespace" select="'neilghosh.com'"/>
<xsl:variable name="vDummy">
<xsl:element name="neil:x" namespace="{$pNamespace}"/>
</xsl:variable>
<xsl:template match="/*">
<xsl:element name="process" namespace="http://example.com">
<xsl:copy-of select="namespace::*"/>
<xsl:copy-of select="ext:node-set($vDummy)/*/namespace::*[.=$pNamespace]"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
When this transformation is applied on the provided XML document:
<test/>
the wanted, correct result is produced:
<process xmlns="http://example.com" xmlns:neil="neilghosh.com" />
Namespace declarations in XML are not attributes even though they look like attributes. In XSLT 2.0 you can use <xsl:namespace name="neil" select="$myNameSpace" /> to add a namespace declaration to the result tree dynamically but that feature is not available in XSLT 1.0.
Don't try to create "xmlns" attributes yourself. Create the namespaces in the XSLT and they will be done automatically.
This XSLT works (tested with Saxon 9.4):
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:neil="neilghosh.com"
xpath-default-namespace="http://example.com"
xmlns="http://example.com" version="2.0">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:param name="myDynamicNamespace" select="'http://neilghosh.com'"/>
<xsl:template match="/">
<xsl:element name="process">
<xsl:namespace name="neil" select="$myDynamicNamespace"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
And gives the following output:
<?xml version="1.0" encoding="UTF-8"?>
<process xmlns="http://example.com" xmlns:neil="http://neilghosh.com"/>
Finally got an workaround which worked with my XSLT Processor (Oracle XML V2 Parser)
I had to transform it to a DOM Document and then persist that DOM to filesystem instead of outputting directly to StreamResult
I used DOMResult in the transform method
Following XSLT fragment worked but there was an extra xmlns:xmlns="http://www.w3.org/2000/xmlns/" which was probably absorbed by Document and did not appear in the final output when I persisted to file system.
<process>
<xsl:attribute name="xmlns">
<xsl:value-of select="'http://example.com'"/>
</xsl:attribute>
<process>
I know this is not the best way to do but given the parse constraint this is the only choice I have now.

Populate XML template-file from XPath Expressions?

What would be the best way to populate (or generate) an XML template-file from a mapping of XPath expressions?
The requirements are that we will need to start with a template (since this might contain information not otherwise captured in the XPath expressions).
For example, a starting template might be:
<s11:Envelope xmlns:s11='http://schemas.xmlsoap.org/soap/envelope/'>
<ns1:create xmlns:ns1='http://predic8.com/wsdl/material/ArticleService/1/'>
<article xmlns:ns1='http://predic8.com/material/1/'>
<name>?XXX?</name>
<description>?XXX?</description>
<price xmlns:ns1='http://predic8.com/common/1/'>
<amount>?999.99?</amount>
<currency xmlns:ns1='http://predic8.com/common/1/'>???</currency>
</price>
<id xmlns:ns1='http://predic8.com/material/1/'>???</id>
</article>
</ns1:create>
</s11:Body>
</s11:Envelope>
Then we are supplied, something like:
expression: /create/article[1]/id => 1
expression: /create/article[1]/description => bar
expression: /create/article[1]/name[1] => foo
expression: /create/article[1]/price[1]/amount => 00.00
expression: /create/article[1]/price[1]/currency => USD
expression: /create/article[2]/id => 2
expression: /create/article[2]/description => some name
expression: /create/article[2]/name[1] => some description
expression: /create/article[2]/price[1]/amount => 00.01
expression: /create/article[2]/price[1]/currency => USD
We should then generate:
<ns1:create xmlns:ns1='http://predic8.com/wsdl/material/ArticleService/1/'>
<article xmlns:ns1='http://predic8.com/material/1/'>
<name xmlns:ns1='http://predic8.com/material/1/'>foo</name>
<description>bar</description>
<price xmlns:ns1='http://predic8.com/common/1/'>
<amount>00.00</amount>
<currency xmlns:ns1='http://predic8.com/common/1/'>USD</currency>
</price>
<id xmlns:ns1='http://predic8.com/material/1/'>1</id>
</article>
<article xmlns:ns1='http://predic8.com/material/2/'>
<name>some name</name>
<description>some description</description>
<price xmlns:ns1='http://predic8.com/common/2/'>
<amount>00.01</amount>
<currency xmlns:ns1='http://predic8.com/common/2/'>USD</currency>
</price>
<id xmlns:ns1='http://predic8.com/material/2/'>2</id>
</article>
</ns1:create>
I am implemented in Java, although I would prefer an XSLT-based solution if one is possible.
PS: This question is the reverse of another question I recently asked.
This transformation creates from the "expressions" an XML document that has the structure of the wanted result -- it remains to transform this result into the final result:
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:my="my:my">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:variable name="vPop" as="element()*">
<item path="/create/article[1]/id">1</item>
<item path="/create/article[1]/description">bar</item>
<item path="/create/article[1]/name[1]">foo</item>
<item path="/create/article[1]/price[1]/amount">00.00</item>
<item path="/create/article[1]/price[1]/currency">USD</item>
<item path="/create/article[1]/price[2]/amount">11.11</item>
<item path="/create/article[1]/price[2]/currency">AUD</item>
<item path="/create/article[2]/id">2</item>
<item path="/create/article[2]/description">some name</item>
<item path="/create/article[2]/name[1]">some description</item>
<item path="/create/article[2]/price[1]/amount">00.01</item>
<item path="/create/article[2]/price[1]/currency">USD</item>
</xsl:variable>
<xsl:template match="/">
<xsl:sequence select="my:subTree($vPop/#path/concat(.,'/',string(..)))"/>
</xsl:template>
<xsl:function name="my:subTree" as="node()*">
<xsl:param name="pPaths" as="xs:string*"/>
<xsl:for-each-group select="$pPaths"
group-adjacent=
"substring-before(substring-after(concat(., '/'), '/'), '/')">
<xsl:if test="current-grouping-key()">
<xsl:choose>
<xsl:when test=
"substring-after(current-group()[1], current-grouping-key())">
<xsl:element name=
"{substring-before(concat(current-grouping-key(), '['), '[')}">
<xsl:sequence select=
"my:subTree(for $s in current-group()
return
concat('/',substring-after(substring($s, 2),'/'))
)
"/>
</xsl:element>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="current-grouping-key()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</xsl:for-each-group>
</xsl:function>
</xsl:stylesheet>
When this transformation is applied on any XML document (not used), the result is:
<create>
<article>
<id>1</id>
<description>bar</description>
<name>foo</name>
<price>
<amount>00.00</amount>
<currency>USD</currency>
</price>
<price>
<amount>11.11</amount>
<currency>AUD</currency>
</price>
</article>
<article>
<id>2</id>
<description>some name</description>
<name>some description</name>
<price>
<amount>00.01</amount>
<currency>USD</currency>
</price>
</article>
</create>
Note:
You need to transform the "expressions" you are given into the format used in this transformation -- this is easy and straightforward.
In the final transformation you need to copy every node "as-is" (using the identity rule), with the exception that the top node should be generated in the "http://predic8.com/wsdl/material/ArticleService/1/" namespace. Note that the other namespaces present in the "template" are not used and can be safely ommitted.
This solution requires you to re-organise your XPATH input information slightly, and to allow a 2-step transformation. The first transformation will write the stylesheet, which will be executed in the second transformation - Thus the client is required to do two invocations of the XSLT engine. Let us know if this is a problem.
Step One
Please re-organise your XPATH information into an XML document like so. It should not be difficult to do, and even an XSLT script could be written to do the job.
<paths>
<rule>
<match>article[1]/id[1]</match>
<namespaces>
<namespace prefix="ns1">http://predic8.com/wsdl/material/ArticleService/1/</namespace>
<!-- The namespace node declares a namespace that is used in the match expression.
There can be many of these. It is not required to define the s11: namespace,
nor the ns1 namespace. -->
</namespaces>
<replacement>1</replacement>
</rule>
<rule>
<match>article[1]/description[1]</match>
<namespaces/>
<replacement>bar</replacement>
</rule>
... etc ...
</paths>
Solution constraints
In the above rules document we are constrained so that:
The match is implicitly prefixed 'expression: /create/'. Don't put that explicitly.
All matches must begin like article[n] where n is some ordinal number.
We can't have zero rules.
Any prefixes that you use in the match, other than s11="http://schemas.xmlsoap.org/soap/envelope/" and ns1="http://predic8.com/wsdl/material/ArticleService/1/". (Note: I don't think it is valid for namespaces to end in '/' - but not sure about that), are defined in the namespaces node.
The above is the input document to the step one transformation. Apply this document to this style-sheet ...
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:step2="http://www.w3.org/1999/XSL/Transform-step2"
xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:ns1="http://predic8.com/wsdl/material/ArticleService/1/"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes='xsl'>
<xsl:output method="xml" indent="yes" encoding="UTF-8" />
<xsl:namespace-alias stylesheet-prefix="step2" result-prefix="xsl"/>
<xsl:template match="/">
<step2:stylesheet version="2.0">
<step2:output method="xml" indent="yes" encoding="UTF-8" />
<step2:variable name="replicated-template" as="element()*">
<step2:apply-templates select="/" mode="replication" />
</step2:variable>
<step2:template match="#*|node()" mode="replication">
<step2:copy>
<step2:apply-templates select="#*|node()" mode="replication" />
</step2:copy>
</step2:template>
<step2:template match="/s11:Envelope/s11:Body/ns1:create/article" mode="replication">
<step2:variable name="replicant" select="." />
<step2:for-each select="for $i in 1 to
{max(for $m in /paths/rule/match return
xs:integer(substring-before(substring-after($m,'article['),']')))}
return $i">
<step2:for-each select="$replicant">
<step2:copy>
<step2:apply-templates select="#*|node()" mode="replication" />
</step2:copy>
</step2:for-each>
</step2:for-each>
</step2:template>
<step2:template match="#*|node()">
<step2:copy>
<step2:apply-templates select="#*|node()"/>
</step2:copy>
</step2:template>
<step2:template match="/">
<step2:apply-templates select="$replicated-template" />
</step2:template>
<xsl:apply-templates select="paths/rule" />
</step2:stylesheet>
</xsl:template>
<xsl:template match="rule">
<step2:template match="s11:Envelope/s11:Body/ns1:create/{match}">
<xsl:for-each select="namespaces/namespace">
<xsl:namespace name="{#prefix}" select="." />
</xsl:for-each>
<step2:copy>
<step2:apply-templates select="#*"/>
<step2:value-of select="'{replacement}'"/>
<step2:apply-templates select="*"/>
</step2:copy>
</step2:template>
</xsl:template>
</xsl:stylesheet>
Step Two
Apply your soap envelope file, as an input document, to the style-sheet which was output from step one. The result is the original soap document, altered as required. This is a sample of a step two style-sheet, with just the first rule (/create/article[1]/id => 1) being considered for the sake of simplicity of illustration.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/"
version="2.0">
<xsl:output method="xml" indent="yes" encoding="UTF-8"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template xmlns:ns1="http://predic8.com/wsdl/material/ArticleService/1/"
match="/s11:Envelope/s11:Body/ns1:create[1]/article[1]/id[1]">
<xsl:copy>
<xsl:apply-templates select="#*"/>
<xsl:value-of select="'1'"/>
<xsl:apply-templates select="*"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
More solution constraints
The template document must contain at least one /s11:Envelope/s11:Body/ns1:create/article . Only the article node is replicated (deeply) as required by rules. Other than than it can be any structure.
The template document cannot contain nested levels of the s11:Envelope/s11:Body/ns1:create node.
Explanation
You will notice that your XPATH expressions are not far removed from a match condition of template. Therefore it is not too difficult to write a stylesheet which re-expresses your XPATH and replacement values as template rules. When writing a style-sheet writing style-sheet the xsl:namespace-alias enables us to disambiguate "xsl:" as an instruction and "xsl:" as intended output. When XSLT 3.0 comes along, we are quiet likely to be able to reduce this algorithm into one step, as it will allow dynamic XPATH evaluation, which is really the nub of your problem. But for the moment we must be content with a 2-step process.
The second style-sheet is a two-phase transformation. The first stage replicates the template from the article level, as many times as needed by the rules. The second phase parses this replicated template, and applies the dynamic rules substituting text values as indicated by the XPATHs.
UPDATE
My original post was wrong. Thanks to Dimitre for pointing out the error. Please find updated solution above.
After-thought
If a two-step solultion is too complicated, and you are running on a wintel platform, you may consider purchasing the commercial version of Saxon. I believe that the commercial version has a dynamic XPATH evaluation function. I can't give you such a solution because I don't have the commercial version. I imagine a solution using an evaluate() function would be a lot simpler. XSLT is just a hobby for me. But if you are using XSLT for business purposes, the price is quiet reasonable.

Java Style XML one node per line and no whitespace

Just fooling with removing whitespace but keeping each node on its own line from an xml document when adding and removing elements from xml in java and I'm having trouble understanding XML Style Sheets.
Here is what's happening so far.
Firstly I have the following XML,
<jobs>
<job>Job 1</job>
<job>Job 2</job>
<job>Job 3</job>
<job>Job 4</job>
</jobs>
Then I remove one of the elements and it ends up looking like this with the whitespacewhere the element was,
<jobs>
<job>Job 1</job>
<job>Job 3</job>
<job>Job 4</job>
</jobs>
So I tried applying the following style sheet I found,
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" omit-xml-declaration="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Which makes the xml appear on one line because it removes all whitespace. But I'm trying to keep the file readable too.
<jobs><job>Job 1</job><job>Job 2</job><job>Job 3</job><job>Job 4</job></jobs>
I was wondering if anyone has a style sheet to achieve this?
You need to add indent="yes" to <xsl:output:
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/>
(Also, you might want to switch to XSL Version 2.0)
Hope this helps

XPATH: select subset of xml file

In my case, I have:
<booklist>
<book id="1">
</book>
<book id="2">
</book>
<book id="3">
</book>
......
</booklist>
How can i just return:
<booklist>
<book id="1">
</book>
</booklist>
if I use /booklist/book[#id=1], I can only get
<book id="1">
</book>
But I also need the document element.
Thanks
Rather than selecting the element that you do want, try excluding the elements that you don't want.
If you are just using XPATH, this will select all of the elements except for the book elements who's #id is not equal to 1 (i.e. <booklist><book id="1" /></booklist>).
//*[not(self::book[#id!='1'])]
If you want an XSLT solution, this stylesheet has an empty template that matches all of the <book> elements that do not have #id="1", which prevents them from being copied into the output.
Everything else (document node <booklist> and <book id="1">) will match the identity template, which copies forward.
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<!--Empty template to prevent book elements
that do not have #id="1" from being
copied into the output -->
<xsl:template match="book[#id!='1']" />
<!--identity template to copy all nodes and attributes to output -->
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
How can i just return:
< booklist >
< book id=1 >
< /book >
< /booklist >
XPath is a query language. Evaluating an XPath expression cannot change the structure of the XML document.
This is why the answer is: No, with XPath this is not possible!
Whenever you want to transform an XML document (which is exactly the case here), the probably best solution is to use XSLT -- a language which was designed especially for processing and transforming tree-structured data.
Here is a very simple XSLT solution:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="book[not(#id=1)]"/>
</xsl:stylesheet>
When this transformation is applied to the provided XML file, the wanted, correct result is produced:
<booklist>
<book id="1"/>
</booklist>
When you try to select a sub-element, only this will be returned.

Categories