diff --git a/format-master.xml b/format-master.xml
index f9ee6be..28ca112 100755
--- a/format-master.xml
+++ b/format-master.xml
@@ -216,6 +216,21 @@
 		<html><xsl:text disable-output-escaping="yes">&amp;#961;</xsl:text></html>
 	</template>
 
+	<template name="element-sign" match="element-sign|element|element-of|is-element-of|is-an-element-of">
+		<latex>\ensuremath{\in}</latex>
+		<html><xsl:text disable-output-escaping="yes">&amp;#8712;</xsl:text></html>
+	</template>
+	
+	<template name="subset-sign" match="subset-sign|subset|subset-of|is-subset-of|is-a-subset-of">
+		<latex>\ensuremath{\subset}</latex>
+		<html><xsl:text disable-output-escaping="yes">&amp;#8834;</xsl:text></html>
+	</template>
+
+	<template name="superset-sign" match="superset-sign|superset|superset-of|is-superset-of|is-a-superset-of">
+		<latex>\ensuremath{\supset}</latex>
+		<html><xsl:text disable-output-escaping="yes">&amp;#8835;</xsl:text></html>
+	</template>
+
 	<template name="LaTeX" match="LaTeX|latex">
 		<latex>{\LaTeX}</latex>
 		<html>L<SUP>A</SUP>T<SUB>E</SUB>X</html>
