tal:replace syntax:
argument ::= (['text'] | 'structure') expression
The tal:replace statement replaces an element with dynamic
content. It replaces the statement element with either text or a
structure (unescaped markup). The body of the statement is an
expression with an optional type prefix. The value of the
expression is converted into an escaped string if you prefix the
expression with text or omit the prefix, and is inserted
unchanged if you prefix it with structure. Escaping consists of
converting "&" to "&", "<" to "<", and
">" to ">".
If the value is nothing, then the element is simply removed. If the value is default, then the element is left unchanged.
The two ways to insert the title of a template:
<span tal:replace="template/title">Title</span>
<span tal:replace="text template/title">Title</span>
Inserting HTML/XML:
<div tal:replace="structure table" />
Inserting nothing:
<div tal:replace="nothing">This element is a comment.</div>