# daps > An open source program for transforming DocBook XML into output formats such as HTML or PDF. > More information: . - Check if a DocBook XML file is valid: `daps -d {{path/to/file.xml}} validate` - Convert a DocBook XML file into PDF: `daps -d {{path/to/file.xml}} pdf` - Convert a DocBook XML file into a single HTML file: `daps -d {{path/to/file.xml}} html --single` - Display help: `daps --help` - Display version: `daps --version`