Convert two site documents from xdoc to Markdown

modello-plugins/modello-plugin-velocity/src/site/markdown/index.md

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+---
+title: Modello Velocity Plugin
+author: Guillaume Nodet
+---
+
+# Modello Velocity Plugin
+
+Modello Velocity Plugin generates files from the Modello model using [Velocity templates](https://velocity.apache.org/engine/2.3/vtl-reference.html).
+
+# Velocity Processing
+
+The plugin is configured with a list of `template` files to evaluate, rfelative to `velocityBasedir` (which defaults to Maven's `${project.basedir}`).
+
+During template evaluation, `#MODELLO-VELOCITY#SAVE-OUTPUT-TO {relative path to file}` pseudo macro is available to send the rendered content to a file.
+
+The Velocity context contains some variables related to the Modello model context that you can use:
+
+| Variable | Type | Description |
+|---|---|---|
+| parameters configured in the plugin | `String` | The parameters values configured in the plugin as `{key}={value}`. |
+| `version` | `String` | The version of the model being used. |
+| `model` | [`Model`](../../modello-core/apidocs/org/codehaus/modello/model/package-summary.html) | The Modello model. |
+| `Helper` | [`Helper`](apidocs/org/codehaus/modello/plugin/velocity/Helper.html) | A helper tool with classical functions useful to generate content from a Modello model API. |
+| `template` | `String` | the template that is being evaluated. |

src/site/markdown/index.md

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+---
+title: Modello
+author: Hervé Boutemy
+---
+
+# Modello
+
+Modello is a framework for code generation from a simple model.
+Modello generates code from a [simple model format](modello.html): based on a plugin architecture, various types of code and
+descriptors can be generated from the single model, including Java POJOs, XML/JSON/YAML marshallers/unmarshallers, XSD, JSON Schema
+and documentation.
+Starting with 2.1.0, content can even be [generated from Velocity templates](modello-plugins/modello-plugin-velocity/) for maximum flexibility.
+
+<img src="modello-deps.png" width="755" height="357" border="0" usemap="#Modello_dependencies" />
+<map name="Modello_dependencies">
+<area shape="rect" coords="270,321,403,357" href="modello-test/" />
+<area shape="rect" coords="270,264,403,300" href="modello-core/" />
+<area shape="rect" coords="300,191,373,228" href="modello-plugins/modello-plugin-java/" />
+<area shape="rect" coords="431,192,503,228" href="modello-plugins/modello-plugin-xml/" />
+<area shape="rect" coords="14,163,132,199"  href="modello-plugins/modello-plugin-converters/" />
+<area shape="rect" coords="668,163,740,198" href="modello-plugins/modello-plugin-xdoc/" />
+<area shape="rect" coords="570,163,643,199" href="modello-plugins/modello-plugin-xsd/" />
+<area shape="rect" coords="404,93,475,129"  href="modello-plugins/modello-plugin-dom4j/" />
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+<area shape="rect" coords="135,195,219,232" href="modello-plugins/modello-plugin-velocity/" />
+<area shape="rect" coords="0,83,754,239"    href="modello-plugins/" />
+<area shape="rect" coords="258,0,415,35"    href="modello-maven-plugin/" />
+<area shape="rect" coords="449,321,583,356" href="../" />
+<area shape="rect" coords="114,263,240,301" href="https://velocity.apache.org/" />
+<area shape="rect" coords="445,37,620,74"   href="https://maven.apache.org/ref/current/maven-plugin-api/" />
+</map>