>>===== MODE =====>>
bibliography
<<===== MODE =====<<

An alternative means of counting authors, from CSL 1.0 design
discussions.

>>===== SCHEMA =====>>
0.9 experimental
<<===== SCHEMA =====<<


>>===== RESULT =====>>
Book One
Book Two
Book Three
<<===== RESULT =====<<


>>===== CSL =====>>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" xml:lang="en">

    <macro name="author-one">
        <names variable="author" end="1">
            <name name-as-sort-order="first"/>
            <substitute>
                <names variable="editor"/>
            </substitute>
        </names>
    </macro>

    <!-- If the name counts of multiple variables total,
         something like this would capture the name count
         of alternative variables, imitating a substitute
         construct.
    -->
    <macro name="author-count">
        <choose>
            <if variable="author" count-min="1" count-max="1">
                <text value="1"/>
            </if>
            <else-if variable="author " count-min="2" count-max="2">
                <text value="2"/>
            </else-if>
            <else-if variable="author" count-min="3">
                <text value="3"/>
            </else-if>
            <else>
                <choose>
                    <if variable="editor" count-min="1" count-max="1">
                        <text value="1"/>
                    </if>
                    <else-if variable="editor" count-min="2" count-max="2">
                        <text value="2"/>
                    </else-if>
                    <else-if variable="editor" count-min="3">
                        <text value="3"/>
                    </else-if>
                    <else>
                        <text value="0"/>
                    </else>
                </choose>
            </else>
        </choose>
    </macro>

    <macro name="author-all">
        <names variable="author">
            <name/>
            <substitute>
                <names variable="editor"/>
            </substitute>
        </names>
    </macro>
    <macro name="year">
        <date>
            <date-part name="year"/>
        </date>
    </macro>

    <citation>
        <layout>
            <text value="Ignore me"/>
        </layout>
    </citation>

    <bibliography>
        <option name="names-count-max" value="3"/>
        <sort>
            <key macro="author-one"/>
            <key macro="author-count"/>
            <key macro="author-all"/>
            <key macro="year"/>
        </sort>
        <layout>
            <text variable="title"/>
        </layout>        
    </bibliography>

</style>
<<===== CSL =====<<


>>===== INPUT =====>>
[
 {
   "id":"item-1",
   "type": "book",
   "author": [
        { "name":"Doe, John" },
   ],
   "issued": {"year": "2000"},
   "title": "Book One"
 },
 {
   "id":"item-2",
   "type": "book",
   "author": [
        { "name":"Doe, John" },
        { "name":"Doe, Jake" },
        { "name":"Jones, Robert" }
   ],
   "issued": {"year": "2000"},
   "title": "Book Three"
 },
 {
   "id":"item-3",
   "type": "book",
   "editor": [
        { "name":"Doe, John" },
        { "name":"Roe, Jane" },
   ],
   "issued": {"year": "2000"},
   "title": "Book Two"
 }
]
<<===== INPUT =====<<