XML Entity Declarations for Characters The character entity sets distributed with DocBook XML are direct copies of the official entities located at http://www.w3.org/2003/entities/ They are distributed for historical compatibility and user convenience. The DocBook Technical Committee no longer attempts to maintain these definitions and will periodically update them from the W3C site if and as they are updated there. Please direct all questions or comments about the entities to the individuals or working groups who maintain the official sets.