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Interpret 'table' signature items more flexibly, automatically adding (Ur) constraints to support a kind of subtyping over (SQL) constraint sets
author Adam Chlipala <adam@chlipala.net>
date Mon, 04 Nov 2013 15:14:23 -0500
parents c125df6fabfc
children
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fun readersChoice r = return <xml><body>
  {case checkUrl r.Url of
       None => <xml>I can't do that, Dave.</xml>
     | Some url => <xml><a href={url}>Your pick, boss</a></xml>}
</body></xml>

fun main () : transaction page = return <xml><body>
  <a href="http://en.wikipedia.org/wiki/Wikipedia:About">Learn</a>
  <br/>

  <form><textbox{#Url}/> <submit action={readersChoice}/></form>
</body></xml>