[xsl] separating string values without tokenize()

I am sure this has been addressed here previously, but I can't find what 
I'm looking for in the archive.
I have this string:

'R0052, R0055, R0057'

I need to create this XML output:

<xref figid="R0052"/>, <xref figid="R0055"/>, <xref figid="R0057"/>

I am restricted to using XSL 1.0. (this is an easy problem for 2.0, but 
I cannot use the tokenize() function).
This specific string has three values, but the string could contain two 
or more comma (and space) delimited values.
How do I get this done with XSLT 1.0?

Charlie O

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