Add support for CC By-NC-SA. This is not actually used by the East
London dataset, but it's a perfectly cromulent Creative Commons
licence. (My guess is that the uses CC By-ND-SA are typos for this,
since that licence is invalid but used, this one is valid but unused,
and they are only two bits, one code-point or one key-position
different.)
<xsl:when test="starts-with(., 'http://creativecommons.org/licenses/by-nc/')">
CC By-NC
</xsl:when>
+ <xsl:when test="starts-with(., 'http://creativecommons.org/licenses/by-nc-sa/')">
+ CC By-NC-SA
+ </xsl:when>
<xsl:when test="starts-with(., 'http://creativecommons.org/licenses/by-nc-nd/')">
CC By-NC-ND
</xsl:when>