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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