Everything about Metals totally explained
The
Macro
Expansion
Template
Attribute
Language complements
TAL, providing
macros which allow the reuse of code across template files. Both were created for
Zope but are used in other
Python projects as well.
Overview
METAL complements
TAL with the ability to reuse code. It allows the developer to define and use macros, which in turn may have
slots; when using a macro, variational content can be specified for a slot.
When generating
XML documents, the XML namespace must be specified
(
xmlns:metal="http://xml.zope.org/namespaces/metal").
Attributes
The following attributes are recognised, normally requiring a „
metal:“ prefix:
define-macro » creates a macro
; define-slot » creates a slot inside a macro
use-macro » uses a macro (normally given via a TALES path expression)
; fill-slot » when using a macro, replaces the default content of the given slot
extend-macro » since Zope v3: extends a macro, comparable to subclassing, by redefining of slots
Normally, just one of those is used at a time.
In cases when no tag is present which lends itself to take the attributes, and in special cases when more than one METAL attribute is needed, special METAL tags can be used, making the „metal:“ prefix optional. E. g. (sketched with Roundup in mind):
<html metal:define-macro="icing">
...
<metal:myslot define-slot="optional-form"/>
...
</html>
<html metal:use-macro="templates/page/macros/icing">
<form metal:fill-slot="optional-form" action="."
tal:attributes="action context/designator">
...
</form>
</html>
Usage
TAL/
TALES/METAL are used by the following projects:
Further Information
Get more info on 'Metals'.
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