Remove unwanted Space and returns using XSLT - xslt

Question

I want to remove Space and returns in between the elements only for the particular child element (i.e) for 'math' as mentioned below XML. I tried <xsl:strip-space elements="m:math"/>. But it removes space for all the elements. I am in need to retain the space after <style> element and space before <b> element.
Input XML:
<?xml version="1.0"?>
<chapter xmlns="http://www.w3.org/1998/Math/MathML">
<style>This is style</style>
<math display="block">
<munder>
<mi mathvariant="normal">BASE</mi>
<mi mathvariant="normal">under</mi>
</munder>
<mo>=</mo>
<munder>
<mrow>
<munder>
<mi mathvariant="normal">BASE</mi>
<mi mathvariant="normal">under</mi>
</munder>
</mrow>
<mphantom>
<mi mathvariant="normal">under</mi>
</mphantom>
</munder>
</math>
<b>This is bold</b>
</chapter>
XSLT tried:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML">
<xsl:output method="xml" encoding="UTF-8" indent="no"/>
<xsl:strip-space elements="*"/>
<xsl:template match="#* | node()">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Required Output:
<?xml version='1.0' encoding='UTF-8'?>
<chapter xmlns="http://www.w3.org/1998/Math/MathML"><style>This is style</style> <math display="block"><munder><mi mathvariant="normal">BASE</mi><mi mathvariant="normal">under</mi></munder><mo>=</mo><munder><mrow><munder><mi mathvariant="normal">BASE</mi><mi mathvariant="normal">under</mi></munder></mrow><mphantom><mi mathvariant="normal">under</mi></mphantom></munder></math> <b>This is bold</b></chapter>

Answer 1

EDIT: Though this answer isn't valid for this question I'm keeping it for reference since I have explained significance of each templates in linearize XML code.. And posting the relevant answer as new answer..
You don't need strip-space, this should do..
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="no" omit-xml-declaration="yes"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="text()">
<xsl:value-of select="normalize-space()" />
</xsl:template>
</xsl:stylesheet>
Explanation:
<xsl:output indent="no" omit-xml-declaration="yes"/>
indent = 'no' takes care of removing addition space between two nodes .. omit-xml-declaration removes xml declaration from output XML. This is optional in your case..
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
Copies nodes as is.. except without indentation ..
<xsl:template match="text()">
<xsl:value-of select="normalize-space()" />
</xsl:template>
Coverts unwanted whitespace characters to single-space char .. example:
<node>
there is lots of space
</node>
output will be like this:
<node>there is lots of space</node>

Answer 2

The trick is to insert <xsl:text> </xsl:text> wherever you want ..
Here I'm inserting this text   (which introduces space) before copying every element that comes under node chapter..
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="no" omit-xml-declaration="no"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="//*[parent::node()[name() = 'chapter']]">
<xsl:text> </xsl:text>
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="text()">
<xsl:value-of select="normalize-space()" />
</xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="utf-8"?><chapter xmlns="http://www.w3.org/1998/Math/MathML"> <style>This is style</style> <math display="block"><munder><mi mathvariant="normal">BASE</mi><mi mathvariant="normal">under</mi></munder><mo>=</mo><munder><mrow><munder><mi mathvariant="normal">BASE</mi><mi mathvariant="normal">under</mi></munder></mrow><mphantom><mi mathvariant="normal">under</mi></mphantom></munder></math> <b>This is bold</b></chapter>
You can modify the condition to accommodate the additional space wherever you want..