As stated previously, the original proceedings used the DocBook XSLT 1.0 stylesheets. [XSLT10-STYLESHEETS] The restyling continued to use the XSLT 1.0 stylesheets because:
There was an existing customisation for the sponsor logo pages and the credits page
People were already familiar with using the customization (not least because at least one of them had written it)
At the time, the DocBook XSLT 2.0 stylesheets had not gained much traction, and the XSLT 3.0 (xslTNG) stylesheets were not publicly available
The initial approach had been to change very little, up until the Garamond font proved unsuitable and it was decided to be consistent with the Markup UK website
The style changes are made using the mechanisms that are provided in the DocBook stylesheets.