[GitHub] [daffodil-site] tuxji commented on a diff in pull request #90: WIP: User doc on packaging and plugins. Drafts

[GitBox <gi...@apache.org>]

tuxji commented on code in PR #90:
URL: https://github.com/apache/daffodil-site/pull/90#discussion_r1020806126


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site/extensions.adoc:
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@@ -0,0 +1,60 @@
+:page-layout: page
+:url-asciidoctor: http://asciidoctor.org
+:keywords: plugins layering UDF charset
+// ///////////////////////////////////////////////////////////////////////////
+//
+// This file is written in AsciiDoc.
+//
+// If you can read this comment, your browser is not rendering asciidoc automatically.
+//
+// You need to install the asciidoc plugin to Chrome or Firefox
+// so that this page will be properly rendered for your viewing pleasure.
+//
+// You can get the plugins by searching the web for 'asciidoc plugin'
+//
+// You will want to change plugin settings to enable diagrams (they're off by default.)
+//
+// You need to view this page with Chrome or Firefox.
+//
+// ///////////////////////////////////////////////////////////////////////////
+//
+// When editing, please start each sentence on a new line.
+// See https://asciidoctor.org/docs/asciidoc-recommended-practices/#one-sentence-per-line[one sentence-per-line writing technique.]
+// This makes textual diffs of this file useful in a similar way to the way they work for code.
+//
+// //////////////////////////////////////////////////////////////////////////
+
+= DFDL Language Extensions in Daffodil
+
+Daffodil contains numerous extensions to the DFDL v1.0 language.
+
+Many of these have been, or will be proposed for inclusion in a future version of the DFDL standard. 
+
+This page provides a central starting point for the documentation of these extension features.
+
+== About Daffodil Plugins
+
+To provide some new advanced format capabilities such as checksums, compressed or encoded data regions, and user-defined-functions, DFDL schemas sometimes must use Daffodil-specific extensions and incorporate Daffodil plugins that provide the small algorithmic aspects needed by these formats.
+
+There are 2 kinds of plugins today supported by Daffodil 3.3.0
+
+- Layering Transformer (e.g., unzip/zip, verify/recompute checksums)
+- User Defined Function (UDF) (e.g., convert mean-sea-level elevation to height-above-ellipsoid)
+
+There is one additional kind of plugin that will be supported by Daffodil 3.4.0

Review Comment:
   Daffodil 3.4,0 has been released so you can update this PR accordingly.



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