Allow doc sigles to be only 2 chars long
diff --git a/xslt/epub2i5.xsl b/xslt/epub2i5.xsl
index 685c276..3098242 100644
--- a/xslt/epub2i5.xsl
+++ b/xslt/epub2i5.xsl
@@ -236,8 +236,8 @@
<xsl:message terminate="yes">ERROR: No author found for ISBN: <xsl:value-of select="$isbn"/></xsl:message>
</xsl:if>
- <xsl:if test="not(matches($sigle, '^[A-Z]{3}[0-9]{2}/[A-Z]{3}\.[0-9]{5}$'))">
- <xsl:message terminate="yes">ERROR: Strange sigle »<xsl:value-of select="$sigle"/>« for ISBN: <xsl:value-of select="$isbn"/></xsl:message>
+ <xsl:if test="not(matches($sigle, '^[A-Z]{3}[0-9]{2}/[A-Z]{2,3}\.[0-9]{5}$'))">
+ <xsl:message terminate="yes">ERROR: Invalid sigle »<xsl:value-of select="$sigle"/>« for ISBN: <xsl:value-of select="$isbn"/></xsl:message>
</xsl:if>
<idsDoc TEIform="TEI.2" type="text" version="1.0">