Self axis

      <xsl:stylesheet
                  xmlns:c="111"
                  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                  version="2.0">
            <xsl:output  method="xml"
                        indent="yes"
                        omit-xml-declaration="yes"/>

            <xsl:template  match="/">
                  <xxx>
                        <xsl:apply-templates  select="/*"/>
                  </xxx>
                  <yyy>
                        <xsl:apply-templates  select="/*/*"/>
                  </yyy>
            </xsl:template>

            <xsl:template  match="*">
                  <zzz  name="{name()}"
                              position="{position()}">
                        <xsl:choose>
                              <xsl:when  test="self::c:aaa">
                                    <MATCH/>
                              </xsl:when>
                              <xsl:otherwise>
                                    <NOTHING/>
                              </xsl:otherwise>
                        </xsl:choose>
                  </zzz>
            </xsl:template>

      </xsl:stylesheet>

      <aaa
                  xmlns:a="111"
                  xmlns:b="111">
            <a:aaa/>
            <b:aaa/>
            <a:aaa
                        xmlns:a="222"/>
      </aaa>

      <xxx
                  xmlns:c="111">
            <zzz  name="aaa"
                        position="1">
                  <NOTHING/>
            </zzz>
      </xxx>
      <yyy
                  xmlns:c="111">
            <zzz  name="a:aaa"
                        position="1">
                  <MATCH/>
            </zzz>
            <zzz  name="b:aaa"
                        position="2">
                  <MATCH/>
            </zzz>
            <zzz  name="a:aaa"
                        position="3">
                  <NOTHING/>
            </zzz>
      </yyy>