simplify_flatten.xsl

<?xml version="1.0" encoding="utf-8"?>

<stylesheet version="2.0"
	xmlns="http://www.w3.org/1999/XSL/Transform"
	xmlns:rng="http://relaxng.org/ns/structure/1.0"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	xmlns:eoa="http://www.edition-open-access.de/ns"
	exclude-result-prefixes="rng xs eoa"
>

	<!-- *************************** -->
	<!-- flatten: -->
	<!-- e.g.: (a | b) | c ~~> a | b | c -->
	<!-- *************************** -->

	<template mode="flatten" match="rng:choice | rng:group | rng:interleave">
		<choose>
			<when test="../name() != name()">
				<copy>
					<apply-templates mode="flatten"/>
				</copy>
			</when>
			<otherwise>
				<apply-templates mode="flatten"/>
			</otherwise>
		</choose>
		<if test="../name != name()"><text>)</text></if>
	</template>

	<!-- default template: copy everything -->
	<template mode="flatten" match="@* | node()">
		<copy>
			<apply-templates mode="flatten" select="@*|node()"/>
		</copy>
	</template>

</stylesheet>