<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<n:invisible xmlns="http://www.w3.org/1999/xhtml" lang="en" xmlns:n="http://nevow.com/ns/nevow/0.1">
<p>
As you can see the macro has been expanded since
you can see this message in the template inside the main
div. Macros are expanded only during the first load at precompile
time. Expanding a macro means that each macro marked tag is
substituted with the result of a macro_somename call. In this case
the result is this text. This is particularly useful when you want
to create something alike MasterPage, or you want to dynamically
load some code for different components of a page, but only one
time. It may seem that macros solve the same problems that
Fragments do, this is true but only to a certain degree. While
Fragments are rendered each time, macros are only rendered
once and before everything else. Use macros when you
need to transform the main template once (or each time the
main template changes on disk)
</p>
<p n:render="advice" />
<p><a href="child">a child</a></p>
</n:invisible>-
root authored5664f5f3