SWI-Prolog -- Manual

Documentation
- Reference manual
- Packages
  - SWI-Prolog SGML/XML parser
    - Bluffer's Guide
      - ‘Goodies' Predicates
        
        load_sgml/3
        
        load_xml/3
        
        load_html/3

2.1 ‘Goodies' Predicates

These predicates are for basic use of the library, converting entire and self-contained files in SGML, HTML, or XML into a structured term. They are based on load_structure/3.

load_sgml(+Source, -ListOfContent, :Options): Calls load_structure/3 with the given Options, using the default option dialect(sgml)
load_xml(+Source, -ListOfContent, :Options): Calls load_structure/3 with the given Options, using the default option dialect(xml)
load_html(+Source, -ListOfContent, :Options): Calls load_structure/3 with the given Options, using the default options dialect(HTMLDialect), where HTMLDialect is html4 or html5 (default), depending on the Prolog flag html_dialect. Both imply the option shorttag(false). The option dtd(DTD) is passed, where DTD is the HTML DTD as obtained using dtd(html, DTD). See dtd/2.