diff --git a/proposal/myrmidon/src/manifest/builtin-ant-descriptor.xml b/proposal/myrmidon/src/manifest/builtin-ant-descriptor.xml
index ad94f1c84..aaaaf2b7a 100644
--- a/proposal/myrmidon/src/manifest/builtin-ant-descriptor.xml
+++ b/proposal/myrmidon/src/manifest/builtin-ant-descriptor.xml
@@ -4,6 +4,8 @@
 
     <listener name="default" classname="org.apache.myrmidon.listeners.DefaultProjectListener"/>
     <aspect name="noop" classname="org.apache.myrmidon.aspects.NoopAspectHandler"/>
+    <project-builder name="ant" classname="org.apache.myrmidon.components.builder.DefaultProjectBuilder"/>
+    <project-builder name="ati" classname="org.apache.myrmidon.components.builder.XSLProjectBuilder"/>
 
     <!-- basic tasks/datatypes/coverters required in most environments -->
     <task name="pattern" classname="org.apache.myrmidon.framework.TypeInstanceTask" />
diff --git a/proposal/myrmidon/src/manifest/builtin-ant-roles.xml b/proposal/myrmidon/src/manifest/builtin-ant-roles.xml
index 3fc668e11..e58c8bc4b 100644
--- a/proposal/myrmidon/src/manifest/builtin-ant-roles.xml
+++ b/proposal/myrmidon/src/manifest/builtin-ant-roles.xml
@@ -1,6 +1,7 @@
 <roles>
-  <role shorthand="task"           name="org.apache.myrmidon.api.Task"/>
-  <role shorthand="data-type"      name="org.apache.myrmidon.api.DataType"/>
-  <role shorthand="listener"       name="org.apache.myrmidon.listeners.ProjectListener"/>
-  <role shorthand="aspect"         name="org.apache.myrmidon.aspects.AspectHandler"/>
+  <role shorthand="task"             name="org.apache.myrmidon.api.Task"/>
+  <role shorthand="data-type"        name="org.apache.myrmidon.api.DataType"/>
+  <role shorthand="listener"         name="org.apache.myrmidon.listeners.ProjectListener"/>
+  <role shorthand="aspect"           name="org.apache.myrmidon.aspects.AspectHandler"/>
+  <role shorthand="project-builder"  name="org.apache.myrmidon.components.builder.ProjectBuilder"/>
 </roles>
\ No newline at end of file