Daniel Krech, recently updated the Redfoot homepage with some additional documentation on what Redfoot is. It's a very interesting concept for leveraging Python (or any other scriptable language) and RDF as a distributed framework for applications.
Beyond the known advantages of modelling distributed components on an RDF Graph with well defined semantics for how you retrieve programs and execute them it also relies on a hybrid of XML and Python called Kid to facilitate templating of HTML.
The advantages of using a flexible programming language (such as Python) for manipulating XML is well written about (sift through the Copia archives, you'll find plenty). Couple that with a well modelled framework for including and executing remote modules as well as a programmatic access (using a similar idiom) to an underlying RDF Graph and you have yourself a very flexible foundation.
For example. Below is the Kid template used to render the contributers page on rdflib.net:
<div xmlns="http://www.w3.org/1999/xhtml"
xmlns:kid="http://purl.org/kid/ns#">
<?python
FOAF = redfoot.namespace("http://xmlns.com/foaf/0.1/")
DOAP = redfoot.namespace("http://usefulinc.com/ns/doap#")
project = URIRef("%s#" % request.host)
people = []
seen = set()
for property in [DOAP.maintainer, DOAP.developer, DOAP.documenter, DOAP.translator, DOAP.tester,DOAP.helper]:
for person in redfoot.objects(project, property):
if person not in seen:
seen.add(person)
label = redfoot.label(person) or person
relationships = set()
for relationship in redfoot.predicates(project, person):
relationships.add(redfoot.label(relationship))
people.append((label, person, relationships))
people.sort()
?>
<ul>
<li kid:for="label, person, relationships in people">
${label},
${redfoot.value(person, FOAF.nick)},
(${", ".join(relationships)})
</li>
</ul>
</div>Redfoot feels like a hybrid of Narval and the 4Suite repository and represents what is common between the tangential goals of those two projects.
rdflib.net and redfoot.net (as well as some other sites) are examples of applications that run on a Redfoot instance.