4RDF scopes in practice

#What Joe's Web catalog says
SOURCE1 = "http://joewebcat.net"
RDF1 = """
<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:dc="http://purl.org/dc/elements/1.1/">
  <rdf:Description about="http://www.w3.org">
    <dc:title>W3C</dc:title>
    <dc:description>A consortium for promoting Web standards</dc:description>
    <dc:format>text/html</dc:format>
    <dc:language>en</dc:language>
  </rdf:Description>
</rdf:RDF>
"""

#What Tito's directory entry says
SOURCE2 = "http://titoworld.net"
RDF2 = """
<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:dc="http://purl.org/dc/elements/1.1/">
  <rdf:Description about="http://www.w3.org">
    <dc:title>The World Wide Web Consortium</dc:title>
    <dc:description>The World Wide Web Consortium (W3C) develops interoperable technologies (specifications, guidelines, software, and tools) to lead the Web to its full potential.</dc:description>
    <dc:format>text/xhtml</dc:format>
    <dc:language>en</dc:language>
  </rdf:Description>
</rdf:RDF>
"""

NSMAP = {
  "dc": "http://purl.org/dc/elements/1.1/",
}

from Ft.Rdf import Util
from Ft.Xml import Domlette
from Ft.Rdf.Serializers.Dom import Serializer

#Use the memory driver
#Create the first model by reading in the source doc
model, db = Util.DeserializeFromString(RDF1, scope=SOURCE1)
#To use the Postgres driver (Pygres required), uncomment the following 2 lines
#from Ft.Rdf.Drivers import Postgres
#model, db = Util.DeserializeFromString(RDF1, driver=Postgres, dbName='scopetest', create=1, scope=SOURCE1)
#Use "dropdb ft__scopetest" to clean up

reader = Domlette.NonvalidatingReader
doc = reader.parseString(RDF2, SOURCE2)
ser = Serializer()
ser.deserialize(model, doc, scope=SOURCE2)

#Show all statements in the model
stmts = model.complete(None, None, None)
for stmt in stmts:
    print stmt

#As an illustration, show all the statements sorted back into scopes
stmt_dict = {}
for stmt in stmts:
    if not stmt_dict.has_key(stmt.scope): stmt_dict[stmt.scope] = []
    stmt_dict[stmt.scope].extend([stmt])
    print; print

for key in stmt_dict.keys():
    print
    print "Scope: ", key
    print "-"*50
    for stmt in stmt_dict[key]:
        print stmt

print

#Now query the title of the W3C Web site
result = Util.VersaQuery("@'http://www.w3.org' - dc:title -> *", model, nsMap=NSMAP)
print "@'http://www.w3.org' - dc:title -> * result: ", result

#Hmm.  Now let us say we only want to see what Joe had to say
result = Util.VersaQuery("@'http://www.w3.org' - dc:title -> *", model, scope=SOURCE1, nsMap=NSMAP)
print "@'http://www.w3.org' - dc:title -> * result (scoped): ", result