Creation of Dynamic elements through XSLT - xslt

Question

<mL>
<s>1</s>
<dt>2022-01-01-01.00.00</dt>
<q>10</q>
</mL>
<mL>
<s>2</s>
<dt>2022-01-01-02.00.00</dt>
<q>11</q>
</mL>
<mL>
<s>3</s>
<dt>2022-01-02-01.00.00</dt>
<q>12</q>
</mL>
<mL>
<s>4</s>
<dt>2022-01-02-02.00.00</dt>
<q>13</q>
</mL>
and I have to transform this structure into something like this based on the changing dates and the time intervals for e.g. in first 2 set of ml tags we can observe <s>1</s> and <s>2</s> have <dt>2022-01-02-01.00.00</dt> and <dt>2022-01-02-02.00.00</dt> here "2022-01-02" is date and "01.00.00" & "02.00.00" are time intervals, and we have to create the no of elements based on these intervals, only check the sample down here.
<Interval>
<IntervalEnding_01.00.00>10</IntervalEnding_01.00.00>
<IntervalEnding_02.00.00>11</IntervalEnding_02.00.00>
</Interval>
<Interval>
<IntervalEnding_01.00.00>12</IntervalEnding_01.00.00>
<IntervalEnding_02.00.00>13</IntervalEnding_02.00.00>
</Interval>
I tried using a template
<xsl:template name="SplitInterval">
<!--xsl:element name="Report_Period_date"-->
<xsl:for-each select="ns1:idGrp/ns1:mL">
<xsl:element name="{concat('IntervalEnding','_', substring (ns1:dt, 1, 4 ),substring (ns1:dt, 6, 2 ),substring (ns1:dt, 9, 2 ),'_',substring (ns1:dt, 12, 2 ),substring (ns1:dt, 15, 2 ))}">
<xsl:value-of select="ns1:q"/>
</xsl:element>
</xsl:for-each>
<!--/xsl:element-->
</xsl:template>
but I am only able to print like without the root Interval tag
<IntervalEnding_01.00.00>12</IntervalEnding_01.00.00>
<IntervalEnding_02.00.00>13</IntervalEnding_02.00.00>
But I need to print like below
<Interval>
<IntervalEnding_01.00.00>12</IntervalEnding_01.00.00>
<IntervalEnding_02.00.00>13</IntervalEnding_02.00.00>
</Interval>

Answer 1

I am guessing (!) you are trying to do something like:
XML (well-formed!!)
<root>
<mL>
<s>1</s>
<dt>2022-01-01-01.00.00</dt>
<q>10</q>
</mL>
<mL>
<s>2</s>
<dt>2022-01-01-02.00.00</dt>
<q>11</q>
</mL>
<mL>
<s>3</s>
<dt>2022-01-02-01.00.00</dt>
<q>12</q>
</mL>
<mL>
<s>4</s>
<dt>2022-01-02-02.00.00</dt>
<q>13</q>
</mL>
</root>
XSLT 1.0
<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:template match="/root">
<output>
<xsl:for-each select="mL[position() mod 2 = 1]">
<Interval>
<xsl:for-each select=". | following-sibling::mL[1]">
<xsl:element name="IntervalEnding_{substring(dt, 12)}">
<xsl:value-of select="q"/>
</xsl:element>
</xsl:for-each>
</Interval>
</xsl:for-each>
</output>
</xsl:template>
</xsl:stylesheet>
Result
<?xml version="1.0" encoding="UTF-8"?>
<output>
<Interval>
<IntervalEnding_01.00.00>10</IntervalEnding_01.00.00>
<IntervalEnding_02.00.00>11</IntervalEnding_02.00.00>
</Interval>
<Interval>
<IntervalEnding_01.00.00>12</IntervalEnding_01.00.00>
<IntervalEnding_02.00.00>13</IntervalEnding_02.00.00>
</Interval>
</output>