Search and Find/Replace Features
Oxygen XML Author includes advanced search capabilities to help you locate documents and resources. The search features are powered by Apache Lucene. Apache Lucene is a free open source information retrieval software library. You can perform simple text searches or more complex searches using the Apache Lucene - Query Parser Syntax.
Note: 
  When Oxygen XML Author performs the indexing of resources,
      referenced content is not taken into account. For example, when DITA documents are indexed,
      the content referenced in a 
@conref or @conkeyref attribute is
      not parsed. The files that make up the index are stored on disk in the 
        [user_home_directory]\AppData\Roaming\com.oxygenxml.author\lucene 
      folder.