How to print the recursive XML data into CSV file using XSLT

Question

This is my sample XML data having only attributes data and having multiple child nodes,

<FIXML  s="...." v="....">
 <Batch ID="....">
  <MktDef MktID="XEUR" MktSegID="14" EfctvBizDt="2017-05-11" NxtEfctvBizDt="2017-05-15" MktSeg="CONF" MarketSegmentDesc="FUT 8-13 Y. SWISS GOV.BONDS 6%" Sym="CH0002741988" ParentMktSegmID="FBND" Ccy="CHF" MktSegStat="1" USFirmFlag="Y" PartID="2">
    <MtchRules MtchRuleProdCmplx="5" MtchAlgo="PT"/>
    <MtchRules MtchRuleProdCmplx="1" MtchAlgo="PT"/>
    <FlexProdEligs FlexProdEligCmplx="5" FlexProdElig="Y"/>
    <BaseTrdgRules QtSideInd="1" FastMktPctg="0">
        <TickRules TickRuleProdCmplx="1" StartTickPxRng="0" EndTickPxRng="99999.9999" TickIncr="0.01"/>
        <TickRules TickRuleProdCmplx="5" StartTickPxRng="0" EndTickPxRng="99999.9999" TickIncr="0.01"/>
        <QuotSizeRules MinBidSz="1" MinOfrSz="1" FastMktInd="0"/>
        <QuotSizeRules MinBidSz="1" MinOfrSz="1" FastMktInd="1"/>
        <PxRngRules PxRngRuleID="75" PxRngProdCmplx="1" StartPxRng="0" EndPxRng="99999.9999" PxRngValu="0.15"/>
        <PxRngRules PxRngRuleID="347" PxRngProdCmplx="5" StartPxRng="0" EndPxRng="99999.9999" PxRngValu="0.12"/>
     </BaseTrdgRules>
    <MDFeedTyps MDFeedTyp="HS" MDBkTyp="2" MktDepth="10" MDRcvryTmIntvl="120000" SvcLctnID1="224.0.50.102" SvcLctnSubID1="59500" SvcLctnID2="224.0.50.230" SvcLctnSubID2="59500"/>
    <MDFeedTyps MDFeedTyp="HI" MDBkTyp="2" MktDepth="10" MktDepthTmIntvl="0" SvcLctnID1="224.0.50.103" SvcLctnSubID1="59501" SvcLctnID2="224.0.50.231" SvcLctnSubID2="59501"/>
    <MDFeedTyps MDFeedTyp="HI" MDBkTyp="3" MktDepthTmIntvl="0" SvcLctnID1="224.0.114.97" SvcLctnSubID1="59501" SvcLctnID2="224.0.114.113" SvcLctnSubID2="59501"/>
    <MDFeedTyps MDFeedTyp="HS" MDBkTyp="3" SvcLctnID1="224.0.114.96" SvcLctnSubID1="59500" SvcLctnID2="224.0.114.112" SvcLctnSubID2="59500"/>
    <MDFeedTyps MDFeedTyp="L" MDBkTyp="2" MktDepth="5" MktDepthTmIntvl="3500" MDRcvryTmIntvl="30000" SvcLctnID1="224.0.50.89" SvcLctnSubID1="59500" SvcLctnID2="224.0.50.217" SvcLctnSubID2="59500"/>
</MktDef>
<SecDef PriSetPx="158.39">
    <Instrmt ID="408805" Src="M" SecTyp="FUT" Status="1" ProdCmplx="1" CFI="FFMPSX" MatDt="2017-06-08" MMY="201706" Mult="1" ValMeth="FUT" SettlMeth="P" SettlSubMeth="4" PxPrcsn="2" MinPxIncr="0.01" MinPxIncrAmt="10">
        <AID AltID="1048612" AltIDSrc="M"/>
        <AID AltID="XF000001RQD8" AltIDSrc="4"/>
    <Evnt EventTyp="7" Dt="2017-06-08"/>
    </Instrmt>
    <MktSegGrp MktSegID="14">
    <SecTrdgRules>
        <BaseTrdgRules>
            <PxRngRules PxRngRuleID="75"/>
        </BaseTrdgRules>
    </SecTrdgRules>
    </MktSegGrp>
</SecDef>
 .
 .
 .
 .
</Batch>
</FIXML>


"<MktDef> and <SecDef>" will be continued for N number of times.

Sample XSLT file:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" >
  <xsl:output method="text" omit-xml-declaration="yes" indent="no"/>

  <xsl:template match="/">
     <xsl:text>MktID,MktSegID,PxRngRuleID,PxRngProdCmplx,StartPxRng,EndPxRng,PxRngValu,</xsl:text>

<xsl:for-each select="FIXML/Batch/MktDef">
  <xsl:value-of select="concat(@MktID,',',@MktSegID,',',ancestor::FIXML/Batch/MktDef/BaseTrdgRules/PxRngRules/@PxRngRuleID,',',@PxRngProdCmplx,',',@StartPxRng,',',@EndPxRng,',',@PxRngValu,'&#xA;')"/>
</xsl:for-each>

  </xsl:template>
</xsl:stylesheet>

Java code to convert XML data to csv:

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.w3c.dom.Document;

class Xml2Csv {

    public static void main(String args[]) throws Exception {
        File stylesheet = new File("style.xsl");
        //File xmlSource = new File("Testing-1.xml");
        File xmlSource = new File("95FILRDF01PUBLI20170511XEUR6NJ92000.xml");

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(xmlSource);

        StreamSource stylesource = new StreamSource(stylesheet);
        Transformer transformer = TransformerFactory.newInstance().newTransformer(stylesource);
        Source source = new DOMSource(document);
        System.out.println(source.toString());
        System.out.println("Hello");
        Result outputTarget = new StreamResult(new File("PxRngRules.csv"));
        transformer.transform(source, outputTarget);

    }
}

Here I want to get the output in the format below.

MktID   MktSegID    PxRngRuleID PxRngProdCmplx  StartPxRng  EndPxRng    PxRngValu
XEUR    19629            75           1            0    99999.9999  0.15
XEUR    65               75           1            0    99999.9999  0.15
XEUR    66               75           1            0    99999.9999  0.15
XEUR    67               75           1            0    99999.9999  0.15

The problem I is I am only getting first "PxRngRules" tag data. I am unable to get the all the occurrences of "PxRngRules".

Answer 1

I may have misunderstood your requirement, but you could try this XSLT, if you wanted multiple lines for each PxRngRules under a MktDef

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" >
  <xsl:output method="text"/>

  <xsl:template match="/">
    <xsl:text>MktID,MktSegID,PxRngRuleID,PxRngProdCmplx,StartPxRng,EndPxRng,PxRngValu</xsl:text>
    <xsl:text>&#xA;</xsl:text>
    <xsl:for-each select="FIXML/Batch/MktDef">
      <xsl:variable name="mktDef" select="concat(@MktID,',',@MktSegID)" />
      <xsl:choose>
        <xsl:when test="BaseTrdgRules/PxRngRules">
          <xsl:for-each select="BaseTrdgRules/PxRngRules">
            <xsl:value-of select="concat($mktDef, ',', @PxRngRuleID,',',@PxRngProdCmplx,',',@StartPxRng,',',@EndPxRng,',',@PxRngValu,'&#xA;')"/>    
          </xsl:for-each>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="concat($mktDef, ',,,,,&#xA;')"/>    
        </xsl:otherwise>
      </xsl:choose>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

If there was always going to be at least one PxRngRules for each MktDef (or if you didn't want output MktDef elements with no PxRngRules you could simplify the code to this

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" >
  <xsl:output method="text"/>

  <xsl:template match="/">
    <xsl:text>MktID,MktSegID,PxRngRuleID,PxRngProdCmplx,StartPxRng,EndPxRng,PxRngValu</xsl:text>
    <xsl:text>&#xA;</xsl:text>
    <xsl:for-each select="FIXML/Batch/MktDef">
      <xsl:variable name="mktDef" select="concat(@MktID,',',@MktSegID)" />
      <xsl:for-each select="BaseTrdgRules/PxRngRules">
        <xsl:value-of select="concat($mktDef, ',', @PxRngRuleID,',',@PxRngProdCmplx,',',@StartPxRng,',',@EndPxRng,',',@PxRngValu,'&#xA;')"/>    
      </xsl:for-each>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>