Description: Every step in the pre-process pipeline defines an extension point before and after the step, to allow plug-ins to integrate additional processing. This allows a plug-in to insert a new step before any pre-processing step, as well as before or after the entire preprocess pipeline.

# Adding Ant targets to the pre-process pipeline

Every step in the pre-process pipeline defines an extension point before and after the step, to allow plug-ins to integrate additional processing. This allows a plug-in to insert a new step before any pre-processing step, as well as before or after the entire preprocess pipeline.

The group of preprocessing steps defines extension points before and after the full preprocessing chain.

`depend.preprocess.pre`
  Preprocessing pre-target; extending this target runs your Ant target before the full preprocess routine begins.
`depend.preprocess.post`
  Preprocessing post-target; extending this target runs your Ant target after the full preprocess routine completes.

In addition, there are extension points to execute an Ant target before individual preprocessing steps.

`depend.preprocess.clean-temp.pre`
  Clean temp pre-target
`depend.preprocess.gen-list.pre`
  Generate list pre-target
`depend.preprocess.debug-filter.pre`
  Debug and filter pre-target
`depend.preprocess.conrefpush.pre`
  Content reference push pre-target
`depend.preprocess.move-meta-entries.pre`
  Move meta entries pre-target
`depend.preprocess.conref.pre`
  Content reference pre-target
`depend.preprocess.coderef.pre`
  Code reference pre-target
`depend.preprocess.mapref.pre`
  Map reference pre-target
`depend.preprocess.keyref.pre`
  Resolve key reference pre-target
`depend.preprocess.mappull.pre`
  Map pull pre-target
`depend.preprocess.chunk.pre`
  Chunking pre-target
`depend.preprocess.maplink.pre`
  Map link pre-target
`depend.preprocess.move-links.pre`
  Move links pre-target
`depend.preprocess.topicpull.pre`
  Topic pull pre-target
`depend.preprocess.copy-files.pre`
  Copy files pre-target
`depend.preprocess.copy-image.pre`
  Copy images pre-target
`depend.preprocess.copy-html.pre`
  Copy HTML pre-target
`depend.preprocess.copy-flag.pre`
  Copy flag pre-target
`depend.preprocess.copy-subsidiary.pre`
  Copy subsidiary pre-target
`depend.preprocess.copy-generated-files.pre`
  Copy generated files pre-target

## Example

The following feature adds "myAntTargetBeforeChunk" Ant target to be executed before the chunk step in preprocessing. It assumes that an Ant file defining that target has already been integrated.

    <plugin id="com.example.extendchunk">
      <feature extension="depend.preprocess.chunk.pre" value="myAntTargetBeforeChunk"/>
    </plugin>

When integrated, the Ant target "myAntTargetBeforeChunk" will be added to the Ant dependency list so that it always runs immediately before the Chunk step.

Parent topic: Creating DITA-OT plug-ins