XML : XSLT 1.0 How to convert < > to Adobe InDesign namespace

InDesign supports special formatting attributes, which let me embed a reference to a paragraph, character, table, or cell style in an XML file. When the XML file is imported and laid out, InDesign uses the referenced style to format that element. But how to convert < and > etc. to aid namespace.

This is my input:

   <article>      <para>&lt;em&gt;Eheniendel il &lt;strong&gt;evel&lt;/strong&gt;&lt;/em&gt;mos illanit atatur &lt;strong&gt;reptatiat&lt;/strong&gt;</para>      <para>Os veles qui ne voluptaquam, quid qui &lt;strong&gt;rehendi&lt;/strong&gt;.</para>      <para>Berchicide &lt;strong&gt;reperumet&lt;/strong&gt; ilicitatin &lt;em&gt;cus&lt;/em&gt;</para>      <para>Dellabores ant. &lt;em&gt;Arte&lt;/em&gt; Dandae si &lt;strong&gt;rectur&lt;/strong&gt;?</para>      <para>Am, voloribus doluptatem aut, &lt;em&gt;cor&lt;/em&gt; aut &lt;em&gt;conse&lt;/em&gt;</para>    

I need such output:

  <article>      <para>          <em aid:cstyle="italic">Eheniendel il <em aid:cstyle="bold-italic">evel</em>          </em>mos illanit atatur <em aid:cstyle="bold">reptatiat</em>      </para>      <para>Os veles qui ne voluptaquam, quid qui <em aid:cstyle="bold">rehendi</em>.</para>      <para>Berchicide <em aid:cstyle="bold">reperumet</em> ilicitatin <em aid:cstyle="italic">cus</em>      </para>      <para>Dellabores ant. <em aid:cstyle="italic">Arte</em> Dandae si <em aid:cstyle="bold">rectur</em>?</para>      <para>Am, voloribus doluptatem aut, <em aid:cstyle="italic">cor</em> aut <em aid:cstyle="italic">conse</em>      </para>  </article>    

I need to convert:

  &lt;em&gt; to <en aid:csytle = "italic">  &lt;strong&gt; to <en aid:csytle = "bold">  &lt;strong&gt;&lt;em&gt; or &lt;em&gt;&lt;strong&gt; to  <en aid:csytle = "bold-italic">    

I made my xslt 1.0 stylesheet which works with normal xml elements like <em> end <strong>. How to improve it to my input?

  <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"  xmlns:aid="http://ns.adobe.com/AdobeInDesign/4.0/"  xmlns:aid5="http://ns.adobe.com/AdobeInDesign/5.0/">    <xsl:output method="xml" indent="yes"/>  <xsl:strip-space elements="*"/>    <xsl:template match="@* | node()">      <xsl:copy>          <xsl:apply-templates select="@* | node()" />      </xsl:copy>  </xsl:template>    <xsl:template match="/root">      <root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xmlns:aid="http://ns.adobe.com/AdobeInDesign/4.0/"          xmlns:aid5="http://ns.adobe.com/AdobeInDesign/5.0/">          <xsl:apply-templates select="@* | node()"/>      </root>  </xsl:template>    <xsl:template match="strong">       <xsl:element name="em">            <xsl:attribute name="aid:cstyle">              <xsl:value-of select="'bold'"/>          </xsl:attribute>       <xsl:apply-templates/>         </xsl:element>  </xsl:template>    <xsl:template match="em">      <xsl:element name="em">            <xsl:attribute name="aid:cstyle">              <xsl:value-of select="'italic'"/>          </xsl:attribute>          <xsl:apply-templates/>      </xsl:element>  </xsl:template>    <xsl:template match="em[../../strong]|strong[../../em]">      <xsl:element name="em">          <xsl:attribute name="aid:cstyle">              <xsl:value-of select="'bold-italic'"/>          </xsl:attribute>          <xsl:apply-templates/>      </xsl:element>  </xsl:template>