# Extension points in `org.dita.base`

The `org.dita.base` plug-in provides common extension points that are available to extend processing in all transformations that DITA Open Toolkit supports.

ant.import
  Adds an Ant import to the main Ant build file.
depend.preprocess.chunk.pre
  Runs an Ant target before the `chunk` step in the pre-processing stage.
depend.preprocess.clean-temp.pre
  Runs an Ant target before the `clean-temp` step in the pre-processing stage.
depend.preprocess.coderef.pre
  Runs an Ant target before the `coderef` step in the pre-processing stage.
depend.preprocess.conref.pre
  Runs an Ant target before the `conref` step in the pre-processing stage.
depend.preprocess.conrefpush.pre
  Runs an Ant target before the `conrefpush` step in the pre-processing stage.
depend.preprocess.copy-files.pre
  Runs an Ant target before the `copy-files` step in the pre-processing stage.
depend.preprocess.copy-flag.pre
  Runs an Ant target before the `copy-flag` step in the pre-processing stage.
depend.preprocess.copy-html.pre
  Runs an Ant target before the `copy-html` step in the pre-processing stage.
depend.preprocess.copy-image.pre
  Runs an Ant target before the `copy-image` step in the pre-processing stage.
depend.preprocess.copy-subsidiary.pre
  Runs an Ant target before the `copy-subsidiary` step in the pre-processing stage.
depend.preprocess.debug-filter.pre
  Runs an Ant target before the `debug-filter` step in the pre-processing stage.
depend.preprocess.gen-list.pre
  Runs an Ant target before the `gen-list` step in the pre-processing stage.
depend.preprocess.keyref.pre
  Runs an Ant target before the `keyref` step in the pre-processing stage.
depend.preprocess.maplink.pre
  Runs an Ant target before the `maplink` step in the pre-processing stage.
depend.preprocess.mappull.pre
  Runs an Ant target before the `mappull` step in the pre-processing stage.
depend.preprocess.mapref.pre
  Runs an Ant target before the `mapref` step in the pre-processing stage.
depend.preprocess.move-meta-entries.pre
  Runs an Ant target before the `move-meta-entries` step in the pre-processing stage.
depend.preprocess.post
  Runs an Ant target after the pre-processing stage.
depend.preprocess.pre
  Runs an Ant target before the pre-processing stage.
depend.preprocess.topicpull.pre
  Runs an Ant target before the `topicpull` step in the pre-processing stage.
dita.basedir-resource-directory
  Flag to use basedir as resource directory
dita.catalog.plugin-info
  Plug-in XML catalog information
dita.conductor.lib.import
  Adds a Java library to the DITA-OT classpath.
dita.conductor.plugin
  Ant conductor plug-in information
dita.conductor.target
  Adds an Ant import to the main Ant build file.
  Attention:
  This extension point is deprecated; use `ant.import` instead.
dita.conductor.target.relative
  Adds an Ant import to the main Ant build file.
  Tip:
  As of DITA-OT 3.0, the `ant.import` extension point can be used instead.
dita.conductor.transtype.check

  Adds a new value to the list of valid transformation types.

  Tip:
  This extension point is still supported for backwards compatibility, but since DITA-OT 2.1, any new customizations should instead use the `<transtype>` element in the Plug-in descriptor file to define a new transformation.
dita.html.extensions
  HTML file extension
dita.image.extensions
  Image file extension
dita.parser
  Custom DITA parser
dita.preprocess.conref.param
  Content reference XSLT parameters
dita.preprocess.debug-filter.param
  Debug filter module parameters
dita.preprocess.map-reader.param
  Debug filter module parameters
dita.preprocess.mappull.param
  Map pull XSLT parameters
dita.preprocess.mapref.param
  Map reference XSLT parameters
dita.preprocess.topic-reader.param
  Debug filter module parameters
dita.preprocess.topicpull.param
  Topic pull XSLT parameters
dita.resource.extensions
  Resource file extension
dita.specialization.catalog
  Adds the content of a catalog file to the main DITA-OT catalog file.
  Attention:
  This extension point is deprecated; use `dita.specialization.catalog.relative` instead.
dita.specialization.catalog.relative
  Adds the content of a catalog file to the main DITA-OT catalog file.
dita.transtype.print
  Defines a transformation as a print type.
dita.xsl.conref
  Content reference XSLT import
dita.xsl.maplink
  Map link XSLT import
dita.xsl.mappull
  Map pull XSLT import
dita.xsl.mapref
  Map reference XSLT import
dita.xsl.messages
  Adds new diagnostic messages to DITA-OT.
dita.xsl.strings
  Generated text
dita.xsl.topicpull
  Topic pull XSLT import
package.support.email
  Specifies the e-mail address of the person who provides support for the DITA-OT plug-in.
package.support.name
  Specifies the person who provides support for the DITA-OT plug-in.
package.version
  Specifies the version of the DITA-OT plug-in.