Split XML file based on a tag using XSLT

Question

I have a need to split an XML file based on a tag inside. Here is the input file will look like. The spli should happen based on Order tag

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<Root>
    <MultiApi>
        <API>
            <Input>
                <Order test="0001" >
                    <OrderLines>
                        <OrderLine test1="123" />
                    </OrderLines>
                </Order>
                <Order test="0002" >
                    <OrderLines>
                        <OrderLine test1="456" />
                    </OrderLines>
                </Order>
                <Order test="0003" >
                    <OrderLines>
                        <OrderLine test1="789" />
                    </OrderLines>
                </Order>
            </Input>
        </API>
    </MultiApi>
    <MultiApi>
        <EOF abc="test" MaxMsgPerFile="1" >
        </EOF>
    </MultiApi>
    </Root>

The output should look like:

<Root>
<MultiApi>
    <API>
        <Input>
            <Order test="0001" >
                <OrderLines>
                    <OrderLine test1="123" />
                </OrderLines>
            </Order>
        </Input>
    </API>
</MultiApi>
<MultiApi>
    <API>
        <Input>
            <Order test="0002" >
                <OrderLines>
                    <OrderLine test1="456" />
                </OrderLines>
            </Order>
        </Input>
    </API>
</MultiApi>
<MultiApi>
    <API>
        <Input>
            <Order test="0003" >
                <OrderLines>
                    <OrderLine test1="789" />
                </OrderLines>
            </Order>
        </Input>
    </API>
</MultiApi>
</Root>

I have tried the below XSL - but was returning null. Any help would be great:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

   <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

      <xsl:variable name="tag">
      <xsl:value-of select="/*/*/EOF/@MaxMsgPerFile"/>
   </xsl:variable>

<xsl:template match="/Root">
    <xsl:copy>


        <xsl:for-each select="MultiApi[not (EOF)]/API/Input/Order[position() mod $tag = 1]">
            <MultiApi>
                <xsl:copy-of select="| . | following-sibling::Order[position() &lt; $tag]"/>

            </MultiApi>
        </xsl:for-each>
    </xsl:copy>
</xsl:template> 

</xsl:stylesheet>

I may not be doing a good job with "following-sibling". Please review and help!

XSLT 1.0 cannot produce multiple files as a result of a single transformation (unless your processor happens to support the EXLT exsl:document extension element). — michael.hor257k
– michael.hor257k, Commented May 9, 2019 at 17:02
I get your point and I just adjusted the question. Thanks @michael.hor257k — F khader
– F khader, Commented May 9, 2019 at 17:34

zx485 · Accepted Answer · 2019-05-09 17:58:16Z

Only requiring one output file, you can easily achieve this with the following stylesheet. The [not(EOF)] predicate on the MultiApi element is not necessary, because the other element does not contain this structure.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:variable name="tag">
        <xsl:value-of select="/*/*/EOF/@MaxMsgPerFile"/>
    </xsl:variable>

    <xsl:template match="/Root">
        <xsl:copy>
            <xsl:for-each select="MultiApi/API/Input/Order">
                <MultiApi>
                    <API>
                        <Input>
                            <xsl:copy-of select="."/>
                        </Input>
                    </API>
                </MultiApi>
            </xsl:for-each>
        </xsl:copy>
    </xsl:template>

</xsl:stylesheet>

Its output is:

<?xml version="1.0" encoding="UTF-8"?>
<Root>
    <MultiApi>
        <API>
            <Input>
                <Order test="0001">
                    <OrderLines>
                        <OrderLine test1="123"/>
                    </OrderLines>
                </Order>
            </Input>
        </API>
    </MultiApi>
    <MultiApi>
        <API>
            <Input>
                <Order test="0002">
                    <OrderLines>
                        <OrderLine test1="456"/>
                    </OrderLines>
                </Order>
            </Input>
        </API>
    </MultiApi>
    <MultiApi>
        <API>
            <Input>
                <Order test="0003">
                    <OrderLines>
                        <OrderLine test1="789"/>
                    </OrderLines>
                </Order>
            </Input>
        </API>
    </MultiApi>
</Root>

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