ZPT Basics (part 1) - Anatomy Lesson
( Page 4 of 5 )

There are a number of TALES expressions in the code snippet shown in the previous page - here's the first one:

<title tal:content="template/title">The title</title>

As you've already seen, this means "replace the content enclosed within the <title> element with the result obtained by evaluating the TALES expression [template/title]".

When the template is rendered, this TALES expression will evaluate to the title of the current page, which will appear within the <title> tag, like this:

<title>Hello ZPT!</title>

The second statement is similar, except that this time, the element itself is replaced, together with the content enclosed within it. When the page is rendered, the TAL statement

<h2>Welcome to <span tal:replace="here/title_or_id">content title or
id</span></h2>

will replace the <span>...</span> tags with the results of evaluating the TALES expression within it, like this:

<h2>Welcome to ZPT Basics</h2>

>>> More Zope Articles          >>> More By Harish Kamath, (c) Melonfire