diff --git a/format-master.xml b/format-master.xml
index 92a09fa..0afc012 100755
--- a/format-master.xml
+++ b/format-master.xml
@@ -1217,7 +1217,7 @@
 		
 		@align: The alignment of the quotation paragraph.
 			'left' [default]
-			'center'
+			'center' | 'centre'
 			'right'
 	-->
 	<template name="quotation" match="quotation">
@@ -1232,7 +1232,7 @@
 					<xsl:value-of select="@align"/>
 					<xsl:text>}</xsl:text>
 				</xsl:when>
-				<xsl:when test="@align = 'center'">
+				<xsl:when test="(@align = 'center') or (@align = 'centre')">
 					<xsl:text>\begin{center}\itshape </xsl:text>
 					<xsl:apply-templates/>
 					<xsl:text>\end{center}</xsl:text>
@@ -1308,13 +1308,13 @@
 		
 		@align: The alignment of the table as a whole.
 			'left' [default]
-			'center'
+			'center' | 'centre'
 			'right'
 		
 		@valign (LaTeX only): Vertical alignment of the tabular within
 		the paragraph. 
 			'top'
-			'center' [default]
+			'center' | 'centre' [default]
 			'bottom'
 		
 		@border: Width of cell border for HTML tables.
@@ -1338,7 +1338,7 @@
 					<xsl:when test="(@align = 'left') or (@align = 'right')">
 						<xsl:text>flush</xsl:text><xsl:value-of select="@align"/>
 					</xsl:when>
-					<xsl:when test="@align = 'center'">
+					<xsl:when test="(@align = 'center') or (@align = 'centre')">
 						<xsl:text>center</xsl:text>
 					</xsl:when>
 				</xsl:choose>
@@ -1384,7 +1384,7 @@
 					<xsl:when test="(@align = 'left') or (@align = 'right')">
 						<xsl:text>flush</xsl:text><xsl:value-of select="@align"/>
 					</xsl:when>
-					<xsl:when test="@align = 'center'">
+					<xsl:when test="(@align = 'center') or (@align = 'centre')">
 						<xsl:text>center</xsl:text>
 					</xsl:when>
 				</xsl:choose>
@@ -1424,7 +1424,7 @@
 		
 		@align: The alignment of this particular column.
 			'left' [default]
-			'center'
+			'center' | 'centre'
 			'right'
 		
 		@left-border: Set to '|' to include a column separator to the
@@ -2641,7 +2641,7 @@
 					<xsl:when test="(@align = 'left') or (@align = 'right')">
 						<xsl:text>flush</xsl:text><xsl:value-of select="@align"/>
 					</xsl:when>
-					<xsl:when test="@align = 'center'">
+					<xsl:when test="(@align = 'center') or (@align = 'centre')">
 						<xsl:text>center</xsl:text>
 					</xsl:when>
 				</xsl:choose>
@@ -2658,7 +2658,7 @@
 					<xsl:when test="(@align = 'left') or (@align = 'right')">
 						<xsl:text>flush</xsl:text><xsl:value-of select="@align"/>
 					</xsl:when>
-					<xsl:when test="@align = 'center'">
+					<xsl:when test="(@align = 'center') or (@align = 'centre')">
 						<xsl:text>center</xsl:text>
 					</xsl:when>
 				</xsl:choose>
@@ -2725,7 +2725,7 @@
 					<xsl:when test="(@align = 'left') or (@align = 'right')">
 						<xsl:text>flush</xsl:text><xsl:value-of select="@align"/>
 					</xsl:when>
-					<xsl:when test="@align = 'center'">
+					<xsl:when test="(@align = 'center') or (@align = 'centre')">
 						<xsl:text>center</xsl:text>
 					</xsl:when>
 				</xsl:choose>
@@ -2738,7 +2738,7 @@
 					<xsl:when test="(@align = 'left') or (@align = 'right')">
 						<xsl:text>flush</xsl:text><xsl:value-of select="@align"/>
 					</xsl:when>
-					<xsl:when test="@align = 'center'">
+					<xsl:when test="(@align = 'center') or (@align = 'centre')">
 						<xsl:text>center</xsl:text>
 					</xsl:when>
 				</xsl:choose>
@@ -2770,7 +2770,7 @@
 	<!--
 		Center stuff on the page.
 	-->
-	<template name="center" match="center|centering">
+	<template name="center" match="center|centering|centre|centring">
 		<latex>
 			\begin{center}
 				<xsl:apply-templates/>