在Python中查询rdf/xml

Question

以下代码：

import rdflib.graph as g
graph = g.Graph()
graph.parse('C:\\Python27\\phyton projects\\senticnet-3.0\\senticnet3.rdf.xml', format='xml')
print graph.serialize(format='pretty-xml')

在Python中返回此数据：

^{pr2}$

如何查询此输出的各个元素？在

例如，如何检索apipolarity的值？在

或者，我怎样才能找回所有的apisemantics，例如“爱另一个人”，“亲爱的”。。。？在

编辑

我可以检索以下数据：

qres = result.query(
    """SELECT ?subject ?predicate ?object
        WHERE {
           ?subject ?predicate ?object.
        }""")

for r in qres.result:
    print str(r[0]), str(r[1]), str(r[2])

返回：

http://sentic.net/api/en/concept/a_lot_of_study http://sentic.net/apitext a lot of study
http://sentic.net/api/en/concept/a_lot_of_study http://sentic.net/apiaptitude -0.111
http://sentic.net/api/en/concept/a_lot_of_study http://sentic.net/apiattention -0.005
http://sentic.net/api/en/concept/a_lot_of_study http://sentic.net/apipolarity -0.064
http://sentic.net/api/en/concept/a_lot_of_study http://sentic.net/apipleasantness -0.074

我现在怎样才能把我的问题缩小到一个特定的概念，比如说，它的极性？在

Answer 1

检索概念“a_little”极性的查询示例：

qres = result.query(
     """SELECT ?object
       WHERE {
          ?subject ?predicate ?object
          FILTER (?subject = <http://sentic.net/api/en/concept/a_little>)
          FILTER (?predicate = <http://sentic.net/apipolarity>)
        }""")

for r in qres.result:
    print str(r[0])

编辑

根据Joshua的建议改进解决方案：

^{pr2}$