Plantinga 2003, Introduction, ¶4: ‘Commercial formats, including STEP and the Logos Library System (LLS), are not designed for integration with the Internet, and preparing texts for these systems requires expensive software, beyond the means of most individuals. Publication in one of these formats may also be controlled by the company or consortium in question. As a result, few public-domain or on-line texts are available in these formats.’ Plantinga, Harry (2003-01-20), ThML: Theological Markup Language version 1.04, Christian Classics Ethereal Library, retrieved 2007-01-06.
"The Vision". CCEL. Christian Classics Ethereal Library. 2006-09-19. Retrieved 2007-01-06. There are 650 XML documents
