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Thinking XML: Basic XML and RDF techniques for knowledge management

Part 2: Combining files into an RDF model, and basic RDF querying

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Listing 7: Query using regular expressions
  from Ft.Rdf import Util
from Ft.Rdf.Model import REGEX

#Returns an RDF model object, and the database instance it uses for
#persistence (in our case, it's just a memory data structure)
model, db = Util.DeserializeFromUri('issues.rdf')
db.begin()

USER_ID_BASE = 'http://users.rdfinference.org/ril/issue-tracker#'
IT_SCHEMA_BASE = 'http://xmlns.rdfinference.org/ril/issue-tracker#'

print 'Actions assigned to uogbuji:'

#Get all actions with "vote" in the body
actions = Util.GetSubjects(model, IT_SCHEMA_BASE+'body', ".*vote.*",
                           objectFlags=REGEX)

for action in actions:
    #See if this action is assigned to uogbuji
    assignee = Util.GetObject(model, action, IT_SCHEMA_BASE+'assign-to')
    body = Util.GetObject(model, action, IT_SCHEMA_BASE+'body')
    if assignee == USER_ID_BASE+'uogbuji':
        print "*", body

db.commit()

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