Hi list,

I'm attempting to make a stylized border around paragraphs that can span pages. The border runs along the side and the top. (Ideally the top border wouldn't repeat, but that's a minor issue.) The issue I'm having is that the title for the text doesn't always appear. Instead, there's a small gap along the top border where the title should be.

Am I going about this the wrong way?

% SOT
\startbuffer[demo]
<html>
<body>
<div class="concurrent" data-title="Berth 5" data-location="San Diego">
Text Goes Here
</div>
<div class="concurrent" data-title="Road" data-location="Beale AFB">
Different Text Goes Here
</div>
</body>
</html>
\stopbuffer

\startxmlsetups xml:xhtml
  \xmlsetsetup{\xmldocument}{*}{-}
  \xmlsetsetup{\xmldocument}{html|body}{xml:*}
  \xmlsetsetup{\xmldocument}{div}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:xhtml}

\startxmlsetups xml:html
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:body
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:div
  \setvariable{div}{\xmlatt{#1}{class}}{#1}
  \start[\xmlatt{#1}{class}]\xmlflush{#1}\stop
\stopxmlsetups

\startusableMPgraphic{GraphicConcurrent}
  begingroup;
    string legend;

    picture title;
    picture border;
    picture bg;

    numeric tw;
    numeric th;

    legend := \MPstring{concurrent};

    title := nullpicture;
    border := nullpicture;
    bg := textext( "\strut " & legend );

    tw := xpart lrcorner bg - xpart llcorner bg;
    th := ypart ulcorner bg - ypart llcorner bg;

    addto title also image(
      fill unitsquare
        xysized (tw + 8, th)
        shifted ulcorner multipars[1]
        shifted 28 right
        shifted 8 down
        withcolor white;
        
      draw
        textext.drt( legend )
        shifted ulcorner multipars[1]
        shifted 32 right
        shifted 3 down;
    );

    addto border also image(
      for i = 1 upto nofmultipars:
        draw
          llcorner multipars[i] --
          ulcorner multipars[i] shifted 8 down ..
          ulcorner multipars[i] shifted 8 right --
          urcorner multipars[i]
          withpen pencircle scaled 0.75 withcolor black;
      endfor; 
    );

    draw image(
      draw border;
      draw title;
    );
  endgroup;
\stopusableMPgraphic

\definetextbackground[TextConcurrentFrame][
  mp=GraphicConcurrent,
  frame=off,
  topoffset=1em,
  leftoffset=1em,
  location=paragraph,
]

\definestartstop[concurrent][
  before={%
    \blank[big]%
    LEGEND: \xmlatt{\getvariable{div}{concurrent}}{data-title}%
    \blank[big]%
    \setMPtext{concurrent}{\xmlatt{\getvariable{div}{concurrent}}{data-title}}
    \startTextConcurrentFrame},
  after={\stopTextConcurrentFrame\blank[big]},
]

\starttext
  \xmlprocessbuffer{main}{demo}{}
\stoptext
% EOT
If I change the following line:

legend := \MPstring{concurrent};

to:

legend := "some string";

Then the title "some string" is repeated. It seems like the value for \MPstring{concurrent} is being cached in some situations and ignored in others.

Essentially, I'm trying to visually offset multiple paragraphs using a left-hand vertical rule along with a top horizontal rule that has a title. Each new "concurrent" section needs its own header that doesn't repeat.

Is there a ConTeXt-way to accomplish this feat?

Cheers!