[xsl] Grouping consecutive page numbers for index (xslt 1.0)

[Kevin Bird <kevin.bird@xxxxxxxxxxxxxxxxxxxxxxx>]

Hello,

Would really appreciate some guidance with the following problem.
I'm stuck with XSLT 1.0.
Any pointers as to the best approach would help.

INPUT:
<pages>
	<page>1</page>
	<page>2</page>
	<page>3</page>
	<page>6</page>
	<page>12</page>
	<page>13</page>
	<page>14</page>
	<page>15</page>
	<page>16</page>
</pages>

DESIRED OUTPUT:
<pages>
	<page>1-3</page>
	<page>6</page>
	<page>12-16</page>
</pages>

Regards.

--
Kevin