MPLUGIN-33: Unrecognized tag when trying to fork lifecycle from an ant-based mojo

o generated the metadata xsd and documentation
o updated modello to 1.0-alpha-20
o update the documentation 

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@684087 13f79535-47bb-0310-9956-ffa450edef68

maven-plugin-tools-model/pom.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <!--
   ~ Licensed to the Apache Software Foundation (ASF) under one
@@ -37,7 +37,7 @@
       <plugin>
         <groupId>org.codehaus.modello</groupId>
         <artifactId>modello-maven-plugin</artifactId>
-        <version>1.0-alpha-18</version>
+          <version>1.0-alpha-20</version>
         <configuration>
           <models>
             <model>src/main/mdo/plugin-metadata.mdo</model>
@@ -46,10 +46,28 @@
         </configuration>
         <executions>
           <execution>
+            <id>site-docs</id>
+            <phase>pre-site</phase>
             <goals>
+              <goal>xsd</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>xsd</id>
+            <phase>pre-site</phase>
+            <goals>
+              <goal>xsd</goal>
+            </goals>
+            <configuration>
+              <outputDirectory>${project.reporting.outputDirectory}</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>standard</id>
+            <goals>
+              <goal>java</goal>
               <goal>xpp3-reader</goal>
               <goal>xpp3-writer</goal>
-              <goal>java</goal>
             </goals>
           </execution>
         </executions>

maven-plugin-tools-model/src/site/apt/index.apt

@@ -29,3 +29,13 @@
 Introduction
 
  The Maven Plugin Tool Model is model to extract descriptors information from plugins.
+
+ The following are generated from this model:
+
+  * {{{./apidocs/index.html}Java sources}} with Reader and Writers for the Xpp3 XML parser
+
+  * A {{{plugin-metadata.html}Descriptor Reference}}
+
+  * An {{{./plugin-metadata-1.0.0.xsd}XSD}}.
+
+  []