title: A modification in layout-masters.xsl in original plugin not shown in output PDF file
body: <p>I made modification in <code>layout-masters.xsl</code> and added the <code>layout-masters.xsl</code> in <code>catalog.xml</code>. However, the change does not appear in the output PDF file. How can I get it to recognize the modification?</p>
  
  <p>If I directly modify <code>layout-masteres</code> in <code>org.dita.pdf2</code> the modification appears to the output PDF file. Therefore, it seems like <code>layout-masters-attr.xsl</code> is working correctly, but somehow fo is not referring to <code>layout-masteres.xsl</code> in my plugin.</p>
  
  <p>The <code>layout-masteres.xsl</code> file:</p>
  
  <pre><code>&lt;!-- First page--&gt;
  &lt;fo:simple-page-master master-name="front-matter-first" xsl:use-attribute-sets="simple-page-master"&gt;
      &lt;fo:region-body xsl:use-attribute-sets="region-body.first"/&gt;
      &lt;fo:region-before region-name="first-body-header" xsl:use-attribute-sets="region-before.first"/&gt;
      &lt;fo:region-after region-name="first-body-footer" xsl:use-attribute-sets="region-after"/&gt;
  &lt;/fo:simple-page-master&gt;
  
  &lt;fo:simple-page-master master-name="front-matter-last" xsl:use-attribute-sets="simple-page-master"&gt;
      &lt;fo:region-body xsl:use-attribute-sets="region-body.first"/&gt;
      &lt;fo:region-before  region-name="last-frontmatter-header" xsl:use-attribute-sets="region-before.first"/&gt;
      &lt;fo:region-after region-name="last-frontmatter-footer" xsl:use-attribute-sets="region-after"/&gt;
  &lt;/fo:simple-page-master&gt;
  </code></pre>
  
  <p>The <code>layout-masteres-attrs.xsl</code> file:</p>
  
  <pre><code>&lt;!--first page without header (pale blue) --&gt;
  &lt;xsl:attribute-set name="region-body.first"&gt;
    &lt;xsl:attribute name="margin-top"&gt;
      &lt;xsl:value-of select="$page-margin-top-first"/&gt;
    &lt;/xsl:attribute&gt;
  &lt;xsl:attribute name="margin-bottom"&gt;
  &lt;xsl:value-of select="$page-margin-bottom"/&gt;
  &lt;/xsl:attribute&gt;
  &lt;xsl:attribute name="{if ($writing-mode = 'lr') then 'margin-left' else 'margin-right'}"&gt;
  &lt;xsl:value-of select="$page-margin-inside"/&gt;
  &lt;/xsl:attribute&gt;
  &lt;xsl:attribute name="{if ($writing-mode = 'lr') then 'margin-right' else 'margin-left'}"&gt;
      &lt;xsl:value-of select="$page-margin-outside"/&gt;
  &lt;/xsl:attribute&gt;
  &lt;xsl:attribute name="background-color"&gt;#84f9ff&lt;/xsl:attribute&gt;
  &lt;/xsl:attribute-set&gt;
  </code></pre>
  
  <p>The <code>catalog.xml</code> file:</p>
  
  <pre><code>&lt;?xml version='1.0' encoding='utf-8'?&gt;
  &lt;catalog prefer="system" xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"&gt;
      &lt;uri name="cfg:fo/attrs/custom.xsl" uri="fo/attrs/custom.xsl" /&gt;
      &lt;uri name="cfg:fo/xsl/custom.xsl" uri="fo/xsl/custom.xsl" /&gt;
      &lt;uri name="cfg:fo/font-mappings.xsl" uri="fo/font-mappings.xsl" /&gt;
      &lt;uri name="cfg:fo/layout-masters.xsl" uri="fo/layout-masters.xsl" /&gt;
  &lt;/catalog&gt;
  </code></pre>