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→Metadata: added discussion of additional prolog elements
The `category` element describes one or more categories that this command is part of. A command topic can have multiple `category` elements.
The `keywords` element can support one or more `keyword` elements, to tag commands that fall into more than one area.
The `prodinfo` element contains metadata about how this command topic related to the entire project. The `prodname` element generally links the command to ConTeXt, while the `vrmlist` allows tracking of version (whatever makes sense) and release (which might be useful for production/experimental commands, etc.).
These elements can be used for conditional processing. For example, we could instruct the DITA processor to only include topics that are user-focused, etc.
In addition to the formal metadata, the `prolog` also supports two other pieces of information: the `source` element, and the `critdates` element.
The `source` element may be useful here to describe a full (non-rooted?) path to the source file in the standard ConTeXt distribution.
The `critdates` element can contain `created` and `revised` elements to capture creating, modification, and expiry dates. This element can be used progamatically to identify documentation that is scheduled for an edit.
==== Syntax ====
