Verbiage from TAG

The most recent architecture document from the TAG includes the
following.  I personally do not understand why SOAP is being called an
architectural style and what a meta-architecture is.
<quote>
4. Interaction
This section will describe the architectural principles and constraints
regarding interactions between components, including such topics as
network protocols and interaction styles, along with interactions
between the Web as a system and the people that make use of it. This
will include the role of architectural styles, such as REST and SOAP,
and the impact of meta-architectures, such as Web Services and the
Semantic Web.
</quote>