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    <font size="4"><font face="monospace">If "block" means multi-line,
        and non-block means single-line, I'm confused as to why we have<br>
        <br>
           public record Mapping(String key, List<Fragment>
        fragments) implements Printable {}<br>
        but<br>
           public record BlockMapping(String key,  List<Printable>
        printables) implements Printable {}<br>
        <br>
        where one has fragments and the other only has Printables. 
        Similarly, we have<br>
        <br>
            public record ValueList(String key, List<ConstantDesc>
        values) implements Fragment {}<br>
            public record BlockList(String key, 
        List<BlockMapping> blockMappings) implements Printable {}<br>
      </font></font><br>
    where again the List element differs.   Is there no way to make the
    block/non-block orthogonal to the payload type?  That would allow us
    to replace the two BlockXxx(...) with different payloads, with a
    Block<T> wrapper as a formatting hint.  <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 7/25/2022 1:51 PM, Adam Sotona
      wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:CY4PR1001MB2150642A76D52BAAF1108DCF8C959@CY4PR1001MB2150.namprd10.prod.outlook.com">
      
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        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Further
            reduction will require additional info about formatting.
            Actual list has very simple printers implementations:<o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">           
          </span><span style="font-family:"Courier
            New",serif;color:#336BDD">switch</span><span style="font-family:"Courier
            New",serif;color:black"> (node) {<o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">               
          </span><span style="font-family:"Courier
            New",serif;color:#336BDD">case</span><span style="font-family:"Courier
            New",serif;color:black">
            <i>Value</i> v -><o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">               
          </span><span style="font-family:"Courier
            New",serif;color:#336BDD">case</span><span style="font-family:"Courier
            New",serif;color:black">
            <i>ValueList</i> vl -><o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">               
          </span><span style="font-family:"Courier
            New",serif;color:#336BDD">case</span><span style="font-family:"Courier
            New",serif;color:black">
            <i>Mapping</i> m <o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">                </span><span style="font-family:"Courier
            New",serif;color:#336BDD">case</span><span style="font-family:"Courier
            New",serif;color:black">
            <i>BlockList</i> bl -><o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">               
          </span><span style="font-family:"Courier
            New",serif;color:#336BDD">case</span><span style="font-family:"Courier
            New",serif;color:black">
            <i>BlockMapping</i> bm -><o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">               
          </span><span style="font-family:"Courier
            New",serif;color:#336BDD">case</span><span style="font-family:"Courier
            New",serif;color:black">
            <i>Comment</i> c -><o:p></o:p></span></p>
        <p class="MsoNormal" style="background:white"><span style="font-family:"Courier
            New",serif;color:black">            }<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Replacing
            all simple values with list of values will wrap everything
            into square brackets and significantly reduce user
            readability.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Or
            dynamic detection of single value in a list will destroy any
            schema for parsing.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Visual
            difference of rendered Mapping and BlockMapping is
            significant in all three formats.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">The
            key here means a mapping key in YAML, object key in JSON and
            element or attribute name in XML, so it defines a key in the
            schemas.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">BlockMapping
            renders as multi-line mapping in YAML, as multi-line object
            in JSON and as multi-line nested elements in XML.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">While
            Mapping renders as single-line flow in YAML, as single-line
            object in JSON and as single  element with attributes only
            in XML.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Dynamic
            detection by content will make the print very unstable and
            unfriendly for user reading (for example one method will be
            collapsed, while the other will expand).<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">I
            don’t see much space for reduction without losing visual
            features.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p></o:p></span></p>
        <div>
          <p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">On 25.07.2022 19:28, "Brian
              Goetz" <a class="moz-txt-link-rfc2396E" href="mailto:brian.goetz@oracle.com"><brian.goetz@oracle.com></a> wrote:<o:p></o:p></span></p>
        </div>
        <p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt"><span style="font-size:11.0pt"><br>
          </span><span style="font-size:13.5pt;font-family:"Courier
            New",serif">That's a good move.  Can we push further? 
            We have types here for mapping a key to a:<br>
            <br>
             - list of simple values<br>
             - list of arbitrary fragments <br>
             - list of printables<br>
             - list of list of printable (blocklist)<br>
            <br>
            <br>
          </span><span style="font-size:11.0pt"><o:p></o:p></span></p>
        <div>
          <p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">On 7/25/2022 1:20 PM, Adam Sotona
              wrote:<o:p></o:p></span></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt" lang="EN-US">Or maybe we could
              let the printer to auto-quote as needed by the actual
              value in the context of the actual format
            </span><span style="font-size:11.0pt;font-family:"Apple
              Color Emoji"" lang="EN-US">😊</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt" lang="EN-US">So yes, it can be
              reduced:</span><o:p></o:p></p>
          <pre style="margin-left:108.0pt;background:white"><span style="color:#336BDD">public</span><span style="color:black"> </span><span style="color:#336BDD">sealed</span><span style="color:black"> </span><span style="color:#336BDD">interface</span><span style="color:black"> <b>Printable</b> {</span><o:p></o:p></pre>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black"> String
              <b>key</b>();</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">sealed</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">interface</span><span style="font-family:"Courier
              New",serif;color:black">
              <b><i>Fragment</i></b> </span><span style="font-family:"Courier
              New",serif;color:#336BDD">extends</span><span style="font-family:"Courier
              New",serif;color:black"> Printable {}</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">record</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>Value</i>(String </span><span style="font-family:"Courier
              New",serif;color:#CE54B8">key</span><span style="font-family:"Courier
              New",serif;color:black">,
              <s>String</s> ConstantDesc </span><span style="color:black">value</span><span style="font-family:"Courier
              New",serif;color:black">)
            </span><span style="color:black">implements</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>Fragment</i> {}</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><s><span style="color:black">public</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
              </span><span style="color:black">record</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
                <i>Quoted</i>(String </span></s><s><span style="font-family:"Courier
                New",serif;color:#CE54B8">key</span></s><s><span style="font-family:"Courier
                New",serif;color:black">, String
              </span><span style="color:black">value</span></s><s><span style="font-family:"Courier
                New",serif;color:black">)
              </span><span style="color:black">implements</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
                <i>Fragment</i> {}</span></s><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><s><span style="color:black">public</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
              </span><span style="color:black">record</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
                <i>Decimal</i>(String </span></s><s><span style="font-family:"Courier
                New",serif;color:#CE54B8">key</span></s><s><span style="font-family:"Courier
                New",serif;color:black">,
              </span><span style="color:black">int</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
              </span><span style="color:black">value</span></s><s><span style="font-family:"Courier
                New",serif;color:black">)
              </span><span style="color:black">implements</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
                <i>Fragment</i> {}</span></s><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">record</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>ValueList</i>(String </span><span style="font-family:"Courier
              New",serif;color:#CE54B8">key</span><span style="font-family:"Courier
              New",serif;color:black">, List<<s>String</s></span><span style="color:black">
            </span><span style="font-family:"Courier New
              \;color\:black";color:black">ConstantDesc>
            </span><span style="color:black">values</span><span style="font-family:"Courier
              New",serif;color:black">)
            </span><span style="color:black">implements</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>Fragment</i> {}</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><s><span style="color:black">public</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
              </span><span style="color:black">record</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
                <i>QuotedList</i>(String </span></s><s><span style="font-family:"Courier
                New",serif;color:#CE54B8">key</span></s><s><span style="font-family:"Courier
                New",serif;color:black">, List<String>
              </span><span style="color:black">values</span></s><s><span style="font-family:"Courier
                New",serif;color:black">)
              </span><span style="color:black">implements</span></s><s><span style="font-family:"Courier
                New",serif;color:black">
                <i>Fragment</i> {}</span></s><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">record</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>Mapping</i>(String </span><span style="font-family:"Courier
              New",serif;color:#CE54B8">key</span><span style="font-family:"Courier
              New",serif;color:black">, List<<i>Fragment</i>>
            </span><span style="color:black">fragments</span><span style="font-family:"Courier
              New",serif;color:black">)
            </span><span style="color:black">implements</span><span style="font-family:"Courier
              New",serif;color:black"> Printable {}</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">record</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>BlockMapping</i>(String </span><span style="font-family:"Courier
              New",serif;color:#CE54B8">key</span><span style="font-family:"Courier
              New",serif;color:black">,  List<Printable>
            </span><span style="color:black">printables</span><span style="font-family:"Courier
              New",serif;color:black">)
            </span><span style="color:black">implements</span><span style="font-family:"Courier
              New",serif;color:black"> Printable {}</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">record</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>BlockList</i>(String </span><span style="font-family:"Courier
              New",serif;color:#CE54B8">key</span><span style="font-family:"Courier
              New",serif;color:black">,  List<<i>BlockMapping</i>>
            </span><span style="color:black">blockMappings</span><span style="font-family:"Courier
              New",serif;color:black">)
            </span><span style="color:black">implements</span><span style="font-family:"Courier
              New",serif;color:black"> Printable {}</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:108.0pt;background:white"><span style="font-family:"Courier
              New",serif;color:black">   
            </span><span style="color:black">public</span><span style="font-family:"Courier
              New",serif;color:black">
            </span><span style="color:black">record</span><span style="font-family:"Courier
              New",serif;color:black">
              <i>Comment</i>(String </span><span style="font-family:"Courier
              New",serif;color:#CE54B8">key</span><span style="font-family:"Courier
              New",serif;color:black">)
            </span><span style="color:black">implements</span><span style="font-family:"Courier
              New",serif;color:black"> Printable {}</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:5.0pt;margin-left:0cm"><o:p> </o:p></p>
        </blockquote>
      </div>
    </blockquote>
    <br>
  </body>
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