Can a given publisher's citations be listed first?

["'William Lupton' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>]

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Hello,

I'd like to sort references so a given publisher's ("BBF") references are
listed first, and am wondering whether it's possible to compare the
publisher variable with "BBF". I tried, but it doesn't seem to work (and
the CSL spec. doesn't appear to indicate that you can do this), so I've
fallen back on using original-publisher (I'll have to make sure that all
the BBF references use this rather than publisher). This works, but I'd
prefer the first approach. Any suggestions?

CSL is attached.

Thanks,
William

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<?xml version="1.0" encoding="utf-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl"
       class="in-text" version="1.0"
       demote-non-dropping-particle="never"
       page-range-format="chicago"
       default-locale="en-GB">
  <!-- This style was originally edited with the Visual CSL Editor
       (https://editor.citationstyles.org/visualEditor/) -->
  <info>
    <title>BBF</title>
    <id>http://www.zotero.org/styles/bbf</id>
    <link rel="self" href="http://www.zotero.org/styles/bbf"/>
    <author>
      <name>William Lupton</name>
      <email>wlupton@broadband-forum.org</email>
    </author>
    <summary>Broadband Forum (BBF) style</summary>
    <updated>2020-03-18T12:35:57+00:00</updated>
    <category/>
  </info>
  <!-- XXX this doesn't work; can't compare strings? -->
  <macro name="publisher-is-bbf">
    <choose>
      <if publisher="BBF">
        <text value="BBF"/>
      </if>
      <else>
        <text value=""/>
      </else>
    </choose>
  </macro>
  <macro name="publisher">
    <choose>
      <if variable="publisher">
        <text variable="publisher"/>
      </if>
      <else>
        <text variable="original-publisher"/>
      </else>
    </choose>
  </macro>
  <citation>
    <!-- XXX This delimiter may not be ideal -->
    <layout delimiter="; ">
      <!-- XXX should remove this? it won't always be what we want -->
      <text variable="title-short" suffix=" "/>
      <group prefix="[" suffix="]">
        <text variable="locator" suffix="/"/>
        <text variable="citation-number"/>
      </group>
    </layout>
  </citation>
  <bibliography entry-spacing="0">
    <sort>
      <!-- XXX would prefer to use this but it doesn't work -->
      <key macro="publisher-is-bbf"/>
      <!-- XXX so am currently using this -->
      <key variable="original-publisher"/>
      <key variable="publisher"/>
      <key variable="call-number"/>
      <key variable="title"/>
    </sort>
    <layout>
      <text variable="citation-number" prefix="[" suffix="]"
            display="left-margin"/>
      <group delimiter=", " display="right-inline">
        <text variable="call-number" text-decoration="underline"/>
        <text variable="title" font-style="italic"/>
        <text macro="publisher"/>
        <date date-parts="year" form="text" variable="issued"/>
        <text variable="URL"/>
      </group>
    </layout>
  </bibliography>
</style>