Beyond all these suggestions, I always create functions that return grouping
and sort  keys as the logic could be much more sophisticated, especially if
you bring in locale-aware processing.

Cheers,

E.
--
Eliot Kimber
http://contrext.com


o;?On 1/25/19, 9:07 AM, "Graydon graydon@xxxxxxxxx"
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

    On Fri, Jan 25, 2019 at 02:44:50PM -0000, Rick Quatro rick@xxxxxxxxxxxxxx
scripsit:
    >    I am creating a glossary and I want to group entries under each
letter of
    >    the alphabet. I am using this and it is working fine:
    [snip]
    >    However, I want to group entries that start with a symbol or number
all
    >    together under one group. I am not sure what to use for the group-by
    >    attribute so that letters are separate from each other and all of
the
    >    non-letter characters are in the same group. Any suggestions would
be
    >    appreciated. Thank you very much.

    I'd use a Unicode character category match for this:

    <xsl:for-each-group select="glossentry"
       group-by="(substring(upper-case(glossterm),1,1)[matches(.,'\p{Lu}')],'
NON-LETTER-GROUP')[1]">
        <topicref navtitle="{current-grouping-key()}" toc="no">
            ...
        </topicref>
    </xsl:for-each-group>

    What you put in for "NON-LETTER-GROUP" might depend on where or how
    you're sorting the glossary entries.

    -- Graydon