post_install() {
    if [ ! -f /etc/xml/catalog ]; then
        xmlcatalog --noout --create /etc/xml/catalog
    fi

    xmlcatalog --noout --add "rewriteSystem" \
        "http://cdn.docbook.org/release/xsl-nons/1.79.2" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteSystem" \
        "https:://cdn.docbook.org/release/xsl-nons/1.79.2" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteURI" \
        "http://cdn.docbook.org/release/xsl-nons/1.79.2" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteURI" \
        "https:://cdn.docbook.org/release/xsl-nons/1.79.2" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteSystem" \
        "http://cdn.docbook.org/release/xsl-nons/current" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteSystem" \
        "https:://cdn.docbook.org/release/xsl-nons/current" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteURI" \
        "http://cdn.docbook.org/release/xsl-nons/current" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteURI" \
        "https:://cdn.docbook.org/release/xsl-nons/current" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteSystem" \
        "http://docbook.sourceforge.net/release/xsl/current" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
    xmlcatalog --noout --add "rewriteURI" \
        "http://docbook.sourceforge.net/release/xsl/current" \
        "/usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2" \
        /etc/xml/catalog
}
post_upgrade() {
    post_remove
    post_install
}
post_remove() {
    xmlcatalog --noout --del /usr/share/xml/docbook/xsl-stylesheets-nons-1.79.2 /etc/xml/catalog
  
    if [ $(vercmp $1 1.72.0-1) -lt 0 ]; then
        xmlcatalog --noout --del "/usr/share/xml/docbook" /etc/xml/catalog
        xmlcatalog --noout --del "file:///etc/xml/docbook" /etc/xml/catalog
    fi
}