Testing if first child is text or an element?

<?xml version="1.0" encoding="UTF-8"?>
<doc>
  <step >
    <info>
      1 The following collection shows examples of non-checklist
      lists with nested checklists.
      <ul>
         <li>This is an unordered list item with a child
            checklist.
         </li>
      </ul>
    </info>
  </step>
  <step >
    <info>
       <p>2 The following collection shows examples of non-checklist
        lists with nested checklists.</p>
       <ul>
          <li>This is an unordered list item with a child
           checklist.
          </li>
       </ul>
   </info>
  </step>
</doc>

+
1 The following collection shows examples of non-checklist
lists with nested checklists.
* This is an unordered list item with a child
checklist.

2 The following collection shows examples of non-checklist
lists with nested checklists.</p>
* This is an unordered list item with a child

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	xmlns:ping="http://pingidentity.com"
	exclude-result-prefixes="xs"
	expand-text="yes"
	version="3.0">

		<xsl:value-of select="$RETURN"/>
		<xsl:call-template name="list-block-start"/>

		<xsl:choose>
			<xsl:when test="@conref or @keyref or @conkeyref">

			</xsl:when>
			<xsl:otherwise>
				<xsl:value-of select="$RETURN"/>     <!-- added for info block in
					rme1659720630395.dita -->
				<xsl:apply-templates />
			</xsl:otherwise>
		</xsl:choose>

		<xsl:if test="
			ancestor::step ">

			<xsl:choose>
				<!-- collapsed tables in kyt1659720640909.dita -->
				<xsl:when test="ancestor::*[contains(@outputclass, 'collapse')]"/>
				<xsl:otherwise>
					<xsl:value-of select="$RETURN"/>
					<xsl:choose>
						<xsl:when test="local-name()='info'">
							<xsl:choose>
								<xsl:when test="child::*[1] instance of element()">
									<!-- do nothing for info element with content -->
								</xsl:when>
								<xsl:when test="child::*[1] instance of text()">
									<xsl:text>+</xsl:text>
									<xsl:value-of select="$RETURN"/>
								</xsl:when>
							</xsl:choose>
						</xsl:when>
						<xsl:otherwise>
							<xsl:text>+</xsl:text>
						</xsl:otherwise>
					</xsl:choose>

				</xsl:otherwise>
			</xsl:choose>
		</xsl:if>
	</xsl:template>