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:met… (More on Metals)