<?xml version="1.0" encoding="Windows-1251"?>

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
	<xsl:output method="xml" />
	
	<xsl:variable name="all-anchor" select="//featureAnchor" />
	<xsl:variable name="all-feature" select="//feature" />
	
	<xsl:template match="/">
		<xsl:apply-templates />
	</xsl:template>
	<xsl:template match="text()">
		<xsl:copy-of select="." />
	</xsl:template>
	<xsl:template match="*">
		<xsl:copy>
			<xsl:copy-of select="@*" />
			<xsl:apply-templates />
		</xsl:copy>
	</xsl:template>
	<xsl:template match="math">
		<xsl:copy>
			<xsl:copy-of select="@*" />
			<xsl:attribute name="number">
				<xsl:choose>
					<xsl:when test="parent::feature">
						<xsl:variable name="id" select="parent::feature/@id" />
						<xsl:value-of select="count($all-anchor[@features=$id]/preceding::math) + count($all-feature[@id=$all-anchor[@features=$id]/preceding::featureAnchor/@features]/math) + count(preceding-sibling::math) + 1" />
					</xsl:when>
					<xsl:otherwise>
						<xsl:value-of select="count(preceding::math) + count($all-feature[@id=current()/preceding::featureAnchor/@features]/math) + 1" />
					</xsl:otherwise>
				</xsl:choose>
			</xsl:attribute>
			<xsl:apply-templates />
		</xsl:copy>
	</xsl:template>
</xsl:stylesheet>