I tried the various suggestions given and still have to do extensive editing of 
OxygenXML docbook to ePub conversions if image scaling is used.

To demonstrate the issue, here is a simple docbook XML file:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="http://docbook.org/xml/5.1/rng/docbook.rng"; 
schematypens="http://relaxng.org/ns/structure/1.0";?>
<?xml-model href="http://docbook.org/xml/5.1/sch/docbook.sch"; 
type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron";?>
<article xmlns="http://docbook.org/ns/docbook"; 
xmlns:xlink="http://www.w3.org/1999/xlink"; version="5.1">
    <info>
        <title>Figure Scaling</title>
        <author>
            <personname>John Doe</personname>
        </author>
        <author>
            <orgname>ABC Publishing</orgname>
        </author>
    </info>
    <sect1>
        <title>The problem</title>
        <para>Image scaled 25%:</para>
        <para><inlinemediaobject>
                <imageobject>
                    <imagedata
                        
fileref="../../../../../Applications/Oxygen%20XML%20Editor/samples/personal-images/michelle.taylor.jpg"
 width="25%"
                    />
                </imageobject>
            </inlinemediaobject></para>
        <para>Image scaled 50%:</para>
        <para><inlinemediaobject>
                <imageobject>
                    <imagedata
                        
fileref="../../../../../Applications/Oxygen%20XML%20Editor/samples/personal-images/michelle.taylor.jpg"
 width="50%"
                    />
                </imageobject>
            </inlinemediaobject></para>
        <para>Image scaled 75%:</para>
        <para><inlinemediaobject>
                <imageobject>
                    <imagedata
                        
fileref="../../../../../Applications/Oxygen%20XML%20Editor/samples/personal-images/michelle.taylor.jpg"
 width="75%"
                    />
                </imageobject>
            </inlinemediaobject></para>
    </sect1>
</article>

__________________

When this is exported, it looks fine on Apple Books but generates errors on 
Epubchecker, since width designation is not allowed in the ePub except as a 
image.style

The OxygenXML generated ebook looks like this:

<?xml version="1.0" encoding="utf-8"?><html 
xmlns="http://www.w3.org/1999/xhtml"; 
xmlns:epub="http://www.idpf.org/2007/ops"; 
xmlns:m="http://www.w3.org/1998/Math/MathML"; 
xmlns:pls="http://www.w3.org/2005/01/pronunciation-lexicon"; 
xmlns:ssml="http://www.w3.org/2001/10/synthesis"; 
xmlns:svg="http://www.w3.org/2000/svg";><head><title>Figure Scaling</title>
    <link rel="stylesheet" type="text/css" href="docbook-epub.css"/>
    <meta name="generator" content="DocBook XSL Stylesheets V1.79.2"/></head>
    <body><header/>
        <section class="article" title="Figure Scaling" id="d0e3"><div 
class="titlepage"><div><div>
            <h1 class="title">Figure Scaling</h1></div><div><div class="author">
                <h3 class="author">John Doe</h3></div></div><div><div 
class="author">
                    <h3 class="author"><span class="orgname">ABC 
Publishing</span></h3></div></div></div><hr/></div>
            <section class="sect1" title="The problem" epub:type="subchapter" 
id="d0e13"><div class="titlepage"><div><div>
                <h2 class="title" style="clear: both">The 
problem</h2></div></div></div>
                   <p>Image scaled 25%:</p>
                   <p><span class="inlinemediaobject"><img 
src="images/michelle.taylor_987157347.jpg" width="25%"/></span></p>
                   <p>Image scaled 50%:</p>
                   <p><span class="inlinemediaobject"><img 
src="images/michelle.taylor_987157347.jpg" width="50%"/></span></p>
                   <p>Image scaled 75%:</p><p><span 
class="inlinemediaobject"><img src="images/michelle.taylor_987157347.jpg" 
width="75%"/></span></p>
            </section>
        </section>
        <footer/>
    </body>
</html>
______________________

This generates errors for each width designation:

E [EPUBCHeck 4.2.4] Error while parsing file: value of attribute “width” is 
invalid; must be an integer

________________________

To fix this I need to add image styles to the CSS:
img.A{width: 25%;}

img.B{width: 50%;}

img.B{width: 75%;}

I can correct the code, but it requires manually changing each image entry, 
which is a real issue if one has 100 or so images. The corrected ePub code 
looks like this:

<?xml version="1.0" encoding="utf-8"?><html 
xmlns="http://www.w3.org/1999/xhtml"; 
xmlns:epub="http://www.idpf.org/2007/ops"; 
xmlns:m="http://www.w3.org/1998/Math/MathML"; 
xmlns:pls="http://www.w3.org/2005/01/pronunciation-lexicon"; 
xmlns:ssml="http://www.w3.org/2001/10/synthesis"; 
xmlns:svg="http://www.w3.org/2000/svg";>
    <head>
        <title>Figure Scaling</title>
        <link rel="stylesheet" type="text/css" href="docbook-epub.css"/><meta 
name="generator" content="DocBook XSL Stylesheets 
V1.79.2"/></head><body><header/>
            <section class="article" title="Figure Scaling" id="d0e3"><div 
class="titlepage"><div><div>
                <h1 class="title">Figure Scaling</h1></div><div><div 
class="author">
                    <h3 class="author">John Doe</h3></div></div><div><div 
class="author">
                        <h3 class="author"><span class="orgname">ABC 
Publishing</span></h3></div></div></div><hr/></div>
                <section class="sect1" title="The problem" 
epub:type="subchapter" id="d0e13"><div class="titlepage"><div><div>
                    <h2 class="title" style="clear: both">The 
problem</h2></div></div></div>
                    <p>Image scaled 25%:</p>
                    <p><span class="inlinemediaobject"><img class="A" 
src="images/michelle.taylor_987157347.jpg"/></span></p>
                    <p>Image scaled 50%:</p>
                    <p><span class="inlinemediaobject"><img class="B" 
src="images/michelle.taylor_987157347.jpg"/></span></p>
                    <p>Image scaled 75%:</p>
                    <p><span class="inlinemediaobject"><img class="C" 
src="images/michelle.taylor_987157347.jpg"/></span></p>
                </section>
            </section>
            <footer/>
        </body>
</html>

Is there a way of scripting this?

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