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A rectangle (or "Zone") in an overall page structure ("Page Layout") into which content Modules may be placed. A rectangle has this quality only when it is nested deeply enough that it is to contain Modules directly; contrast this with rectangles that instead contain ("nest") other Zones. A Module Zone is a named "Zone" which can form part of a "Buildlist" entry: a Module "instancename" assigned to a particular "Module Zone." The naming convention is discussed in the documentation.

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Within a Zone on a Page, the Position of a Module is denoted by an appended "underscore_letter" (e.g. _a, _b), to indicate the order of placement, going in simple sequence from top to bottom (following the "flow" of the Zone in the Page).

Within a Zone in a Module, the Position of a "Place-able Element" is denoted not in a basic string naming convention (as above), but instead by the attribute position in the "EZA" recipe XML file: <eza zone="A" position="1" elementName="header"/>. Here too, the Position indicates the order of setting down the "Place-able Elements", going in simple sequence from top to bottom (following the "flow" of the Zone in the Module).

An "application" of XML (the eXtensible Markup Language) is an instance of an XML vocabulary. It is the use (application) of the rules as laid out in the general meta-language XML (a language with which to create other languages, or "vocabularies"), in defining a set of particular rules for an instance of an applied language: a "vocabulary," or set of defined elements and attributes, to be used for a particular purpose.

Examples in this website build system are: BusinessML, StructureML, StructureLayoutML, and SiteHTML. Each of these works with, to one degree or another, the W3C XML application XHTML 1.0 Transitional.