a dummy noop/skip file; tweaked extract/inline tricks

git-svn-id: https://slps.svn.sourceforge.net/svnroot/slps@841 ab42f6e0-554d-0410-b580-99e487e6eeb2

topics/transformation/normalization/empty.xbgf

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xbgf:sequence xmlns:xbgf="http://planet-sl.org/xbgf" xmlns:bgf="http://planet-sl.org/bgf">
+	<!-- an ugly replacement for a noop/id/skip command that is lacking in xbgf now -->
+	<xbgf:introduce>
+		<bgf:production>
+			<nonterminal>temporary_nonterminal_name_which_is_unique</nonterminal>
+			<bgf:expression>
+				<epsilon/>
+			</bgf:expression>
+		</bgf:production>
+	</xbgf:introduce>
+	<xbgf:eliminate>
+		<nonterminal>temporary_nonterminal_name_which_is_unique</nonterminal>
+	</xbgf:eliminate>
+</xbgf:sequence>

topics/transformation/normalization/subdefs/extract.xslt

@@ -21,7 +21,7 @@
 				<bgf:production>
 					<nonterminal>
 						<xsl:value-of select="$name"/>
-						<xsl:text>-grp-</xsl:text>
+						<xsl:text>_grp_</xsl:text>
 						<xsl:value-of select="position()"/>
 					</nonterminal>
 					<bgf:expression>

topics/transformation/normalization/subdefs/inline.xslt

@@ -4,7 +4,7 @@
 	<xsl:template match="/bgf:grammar">
 		<xbgf:sequence xmlns:bgf="http://planet-sl.org/bgf" xmlns:xbgf="http://planet-sl.org/xbgf">
 			<xsl:for-each select="bgf:production">
-				<xsl:if test="contains(nonterminal,'-grp-')">
+				<xsl:if test="contains(nonterminal,'_grp_')">
 					<xbgf:inline>
 						<xsl:value-of select="nonterminal"/>
 					</xbgf:inline>