XMLPaper uses the DocBook format for the paper across all the stages of its lifecycle.
DocBook has special markup for articles and is rich enough to support embedded objects like images, videos, mathematical equations, tables, code blocks and so on. However, DocBook is not the only suitable XML vocabulary - JATS (Journal Article Tag Suite) is also a viable alternative.
Some advantages of using DocBook include:
The authors can focus on creating the content of the paper and leaving it to conference organizers to define the layout and style of the published version of the paper.
The content can be published to multiple formats, such as PDF, web page and e-book. Having the source available, one can re-publish it later as new formats become popular, e.g. audio paper.
Being an open standard format, it is good for archiving purposes. Some academic papers have a longer lifetime that the company than a particular proprietary format.
Being widely used in enterprise content creation, there is wide range of tooling available for XML-related tasks such as editing, collaboration, and publishing.