Challenge 2.5

challenge2-5-Result.xml

<result>
    <r>
        <position>3</position>
        <content>
            <div class="b">
                <div class="c">
                    <b>...</b>
                    <!-- мы тут -->
                </div>
            </div>
        </content>
    </r>
    <r>
        <position>1</position>
        <content></content>
    </r>
    <r>
        <position>4</position>
        <content>
            <i class="b">
                <div class="GR">
                    <span></span>
                </div>
                <div class="b">
                    <div class="c">
                        <c>
                            <!-- мы тут -->
                            <test>
                                <ololo>...</ololo>
                            </test>
                        </c>
                    </div>
                    <div class="GR">
                        <span></span>
                    </div>    
                </div>     
            </i>
        </ololo>
    </div>
</div>

challenge2-5-Source.xml

<div>
    <div class="a">
        <i>
            <div class="b">
                <div class="c">
                    <b>...</b>
                    <!-- мы тут -->
                </div>
            </div>
        </i>
    </div>
    <div class="a">
        <div>
            <d>...</d>
            <!-- мы тут -->
        </div>
    </div>
    <div>
        <ololo>
            <i class="b">
                <div class="GR">
                    <span></span>
                </div>
                <div class="b">
                    <div class="c">
                        <c>
                            <!-- мы тут -->
                            <test>
                                <ololo>...</ololo>
                            </test>
                        </c>
                    </div>
                    <div class="GR">
                        <span></span>
                    </div>
                </div>
            </i>
        </ololo>
    </div>
</div>

challenge2-5.xsl

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/>
	<xsl:template match="/">
            <result>
                <xsl:apply-templates/>
            </result>
	</xsl:template>
	<xsl:template match="b | c | d">
            <r>
                <xsl:variable name="index">
                    <xsl:apply-templates select="ancestor::*[not(@class)][1]" mode="count">
                        <xsl:with-param name="pId" select="generate-id()"/>
                    </xsl:apply-templates>
                </xsl:variable>
                <position>
                    <xsl:value-of select="$index"/>
                </position>
                <content>
                    <xsl:copy-of select="ancestor::*[position() &lt; number($index)][last()]"/>
                </content>
	    </r>
	</xsl:template>
	<xsl:template match="*" mode="count">
	    <xsl:param name="pId"/>
	    <xsl:value-of select="
                count(
		    descendant::*
                        [descendant-or-self::*[generate-id() = $pId]]
                        [not(ancestor::*[generate-id() = $pId])]
		    )
	        "/>
	</xsl:template>
</xsl:stylesheet>