The : tells dryml to replace a particular parameter in the tag.  Depending 
on the tag, there may or may not be a default parameter, which is what gets 
content if no parameter is specified.

So:

<form>
  <field-list ... />
</form>

Is equivalent to (roughly):

<form>
  <default:>
    <field-list ... />
  </default:>
</form>

If default, or any other parameter you ask it to replace, is not defined, 
dryml silenty drops the content.  That's what you're seeing with the 
show-page.

One other potential point of confusion is that the : is also used as a field 
attribute shortcut.

<view:title /> is the same as <view field="title" />

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