> Phase 0, XML parse:
>    Resolve entities;
>    Determine source doc encoding
>    Validate (if using a validating parser with validation switched on)
>    Catalog resolution (if appropriate)
>    Build the internal model of the source document
>    Build the internal model of the stylesheet


As a subheader under validation I would add 'Populate defaulted values
if using DTD/XML Schema, thankfully not an issue if using RNG'

:)