/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 413 by jonathan, Wed Feb 19 16:52:04 2003 UTC revision 1408 by frank, Mon Jul 14 09:38:29 2003 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
4  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
# Line 13  Parser for thuban session files. Line 13  Parser for thuban session files.
13    
14  __version__ = "$Revision$"  __version__ = "$Revision$"
15    
16  import sys, string, os  import string, os
17    
18  import xml.sax  import xml.sax
19  import xml.sax.handler  import xml.sax.handler
20  from xml.sax import make_parser, ErrorHandler  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21    
22  from Thuban import _  from Thuban import _
23  from Thuban.common import *  
24    from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
25         FIELDTYPE_STRING
26    
27    from Thuban.Model.color import Color, Transparent
28    
29  from Thuban.Model.session import Session  from Thuban.Model.session import Session
30  from Thuban.Model.map import Map  from Thuban.Model.map import Map
31  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer, RasterLayer
 from Thuban.Model.color import Color  
32  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
33    from Thuban.Model.range import Range
34  from Thuban.Model.classification import Classification, \  from Thuban.Model.classification import Classification, \
35      ClassDataDefault, ClassDataPoint, ClassDataRange, ClassDataMap      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
36        ClassGroupProperties
37    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
38    from Thuban.Model.table import DBFTable
39    from Thuban.Model.transientdb import TransientJoinedTable
40    
41    class LoadError(Exception):
42        pass
43    
44    from Thuban.Model.xmlreader import XMLReader
45    import resource
46    
47  def parse_color(color):  def parse_color(color):
48      """Return the color object for the string color.      """Return the color object for the string color.
# Line 39  def parse_color(color): Line 52  def parse_color(color):
52      """      """
53      color = string.strip(color)      color = string.strip(color)
54      if color == "None":      if color == "None":
55          result = Color.None          result = Transparent
56      elif color[0] == '#':      elif color[0] == '#':
57          if len(color) == 7:          if len(color) == 7:
58              r = string.atoi(color[1:3], 16) / 255.0              r = string.atoi(color[1:3], 16) / 255.0
# Line 53  def parse_color(color): Line 66  def parse_color(color):
66          raise ValueError(_("Invalid color specification %s") % color)          raise ValueError(_("Invalid color specification %s") % color)
67      return result      return result
68    
69    class AttrDesc:
70    
71  class ProcessSession(xml.sax.handler.ContentHandler):      def __init__(self, name, required = False, default = "",
72                     conversion = None):
73            if not isinstance(name, tuple):
74                fullname = (None, name)
75            else:
76                fullname = name
77                name = name[1]
78            self.name = name
79            self.fullname = fullname
80            self.required = required
81            self.default = default
82            self.conversion = conversion
83    
84            # set by the SessionLoader's check_attrs method
85            self.value = None
86    
87    
88    class SessionLoader(XMLReader):
89    
90        def __init__(self):
91            """Inititialize the Sax handler."""
92            XMLReader.__init__(self)
93    
     # Dictionary mapping element names (or (URI, element name) pairs for  
     # documents using namespaces) to method names. The methods should  
     # accept the same parameters as the startElement (or startElementNS)  
     # methods. The start_dispatcher is used by the default startElement  
     # and startElementNS methods to call a method for the open tag of an  
     # element.  
     start_dispatcher = {}  
   
     # end_dispatcher works just like start_dispatcher but it's used by  
     # endElement and endElementNS. The method whose names it maps to  
     # should accept the same parameters as endElement and endElementNS.  
     end_dispatcher = {}  
   
   
     def __init__(self, directory):  
         """Inititialize the Sax handler.  
   
         The directory parameter should be the directory containing the  
         session file. It's needed to interpret embedded relative  
         filenames.  
         """  
         self.directory = directory  
         self.chars = ''  
94          self.theSession = None          self.theSession = None
95          self.aMap = None          self.aMap = None
96          self.aLayer = None          self.aLayer = None
97    
98      def startElementNS(self, name, qname, attrs):          # Map ids used in the thuban file to the corresponding objects
99          """Call the method given for name in self.start_dispatcher          # in the session
100          """          self.idmap = {}
101          if name[0] is None:  
102              method_name = self.start_dispatcher.get(name[1])          dispatchers = {
103          else:              'session'       : ("start_session",        "end_session"),
104              # Dispatch with namespace              'fileshapesource': ("start_fileshapesource", None),
105              method_name = self.start_dispatcher.get(name)              'derivedshapesource': ("start_derivedshapesource", None),
106          if method_name is not None:              'filetable': ("start_filetable", None),
107              getattr(self, method_name)(name, qname, attrs)              'jointable': ("start_jointable", None),
108    
109                'map'           : ("start_map",            "end_map"),
110                'projection'    : ("start_projection",     "end_projection"),
111                'parameter'     : ("start_parameter",      None),
112                'layer'         : ("start_layer",          "end_layer"),
113                'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
114                'classification': ("start_classification", "end_classification"),
115                'clnull'        : ("start_clnull",         "end_clnull"),
116                'clpoint'       : ("start_clpoint",        "end_clpoint"),
117                'clrange'       : ("start_clrange",        "end_clrange"),
118                'cldata'        : ("start_cldata",         "end_cldata"),
119                'table'         : ("start_table",          "end_table"),
120                'labellayer'    : ("start_labellayer",     None),
121                'label'         : ("start_label",          None)}
122    
123            # all dispatchers should be used for the 0.8 and 0.9 namespaces too
124            for xmlns in ("http://thuban.intevation.org/dtds/thuban-0.8.dtd",
125                          "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd"):
126                for key, value in dispatchers.items():
127                    dispatchers[(xmlns, key)] = value
128    
129      def endElementNS(self, name, qname):          XMLReader.AddDispatchers(self, dispatchers)
         """Call the method given for name in self.end_dispatcher  
         """  
         if name[0] is None:  
             method_name = self.end_dispatcher.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.end_dispatcher.get(name)  
         if method_name is not None:  
             getattr(self, method_name)(name, qname)  
130    
131      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
132          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'),
133      start_dispatcher['session'] = "start_session"                                                          None)))
134    
135      def end_session(self, name, qname):      def end_session(self, name, qname):
136          pass          pass
137      end_dispatcher['session'] = "end_session"  
138        def check_attrs(self, element, attrs, descr):
139            """Check and convert some of the attributes of an element
140    
141            Parameters:
142               element -- The element name
143               attrs -- The attrs mapping as passed to the start_* methods
144               descr -- Sequence of attribute descriptions (AttrDesc instances)
145    
146            Return a dictionary containig normalized versions of the
147            attributes described in descr. The keys of that dictionary are
148            the name attributes of the attribute descriptions. The attrs
149            dictionary will not be modified.
150    
151            If the attribute is required, i.e. the 'required' attribute of
152            the descrtiption is true, but it is not in attrs, raise a
153            LoadError.
154    
155            If the attribute has a default value and it is not present in
156            attrs, use that default value as the value in the returned dict.
157    
158            If a conversion is specified, convert the value before putting
159            it into the returned dict. The following conversions are
160            available:
161    
162               'filename' -- The attribute is a filename.
163    
164                             If the filename is a relative name, interpret
165                             it relative to the directory containing the
166                             .thuban file and make it an absolute name
167    
168               'shapestore' -- The attribute is the ID of a shapestore
169                               defined earlier in the .thuban file. Look it
170                               up self.idmap
171    
172               'table' -- The attribute is the ID of a table or shapestore
173                          defined earlier in the .thuban file. Look it up
174                          self.idmap. If it's the ID of a shapestore the
175                          value will be the table of the shapestore.
176            """
177            normalized = {}
178    
179            for d in descr:
180                if d.required and not attrs.has_key(d.fullname):
181                    pass
182                #raise LoadError("Element %s requires an attribute %r"
183                #                    % (element, d.name))
184                value = attrs.get(d.fullname, d.default)
185    
186                if d.conversion == "shapesource":
187                    if value in self.idmap:
188                        value = self.idmap[value]
189                    else:
190                        raise LoadError("Element %s requires an already defined ID"
191                                        " in attribute %r"
192                                        % (element, d.name))
193                elif d.conversion == "table":
194                    if value in self.idmap:
195                        value = self.idmap[value]
196                        if isinstance(value, ShapefileStore):
197                            value = value.Table()
198                    else:
199                        raise LoadError("Element %s requires an already defined ID"
200                                        " in attribute %r"
201                                        % (element, d.name))
202                elif d.conversion == "filename":
203                    value = os.path.abspath(os.path.join(self.GetDirectory(),
204                                                         value))
205    
206                normalized[d.name] = value
207            return normalized
208    
209        def start_fileshapesource(self, name, qname, attrs):
210            attrs = self.check_attrs(name, attrs,
211                                      [AttrDesc("id", True),
212                                       AttrDesc("filename", True,
213                                                conversion = "filename"),
214                                       AttrDesc("filetype", True)])
215            ID = attrs["id"]
216            filename = attrs["filename"]
217            filetype = attrs["filetype"]
218            if filetype != "shapefile":
219                raise LoadError("shapesource filetype %r not supported" % filetype)
220            self.idmap[ID] = self.theSession.OpenShapefile(filename)
221    
222        def start_derivedshapesource(self, name, qname, attrs):
223            attrs = self.check_attrs(name, attrs,
224                                     [AttrDesc("id", True),
225                                      AttrDesc("shapesource", True,
226                                               conversion = "shapesource"),
227                                      AttrDesc("table", True, conversion="table")])
228            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
229            self.theSession.AddShapeStore(store)
230            self.idmap[attrs["id"]] = store
231    
232        def start_filetable(self, name, qname, attrs):
233            attrs = self.check_attrs(name, attrs,
234                                     [AttrDesc("id", True),
235                                      AttrDesc("title", True),
236                                      AttrDesc("filename", True,
237                                               conversion = "filename"),
238                                      AttrDesc("filetype")])
239            filetype = attrs["filetype"]
240            if filetype != "DBF":
241                raise LoadError("shapesource filetype %r not supported" % filetype)
242            table = DBFTable(attrs["filename"])
243            table.SetTitle(attrs["title"])
244            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
245    
246        def start_jointable(self, name, qname, attrs):
247            attrs = self.check_attrs(name, attrs,
248                                     [AttrDesc("id", True),
249                                      AttrDesc("title", True),
250                                      AttrDesc("left", True, conversion="table"),
251                                      AttrDesc("leftcolumn", True),
252                                      AttrDesc("right", True, conversion="table"),
253                                      AttrDesc("rightcolumn", True),
254    
255                                      # jointype is required for file
256                                      # version 0.9 but this attribute
257                                      # wasn't in the 0.8 version because of
258                                      # an oversight so we assume it's
259                                      # optional since we want to handle
260                                      # both file format versions here.
261                                      AttrDesc("jointype", False,
262                                               default="INNER")])
263    
264            jointype = attrs["jointype"]
265            if jointype == "LEFT OUTER":
266                outer_join = True
267            elif jointype == "INNER":
268                outer_join = False
269            else:
270                raise LoadError("jointype %r not supported" % jointype )
271            table = TransientJoinedTable(self.theSession.TransientDB(),
272                                         attrs["left"], attrs["leftcolumn"],
273                                         attrs["right"], attrs["rightcolumn"],
274                                         outer_join = outer_join)
275            table.SetTitle(attrs["title"])
276            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
277    
278      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
279          """Start a map."""          """Start a map."""
280          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
     start_dispatcher['map'] = "start_map"  
281    
282      def end_map(self, name, qname):      def end_map(self, name, qname):
283          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
284      end_dispatcher['map'] = "end_map"          self.aMap = None
285    
286      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
287            self.ProjectionName = self.encode(attrs.get((None, 'name'), None))
288          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     start_dispatcher['projection'] = "start_projection"  
289    
290      def end_projection(self, name, qname):      def end_projection(self, name, qname):
291          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
292      end_dispatcher['projection'] = "end_projection"              obj = self.aLayer
293            elif self.aMap is not None:
294                obj = self.aMap
295            else:
296                assert False, "projection tag out of context"
297                pass
298    
299            obj.SetProjection(
300                Projection(self.ProjectionParams, self.ProjectionName))
301    
302      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
303          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
304          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
305          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
306    
307      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
308          """Start a layer          """Start a layer
# Line 143  class ProcessSession(xml.sax.handler.Con Line 311  class ProcessSession(xml.sax.handler.Con
311          attrs which may be a dictionary as well as the normal SAX attrs          attrs which may be a dictionary as well as the normal SAX attrs
312          object and bind it to self.aLayer.          object and bind it to self.aLayer.
313          """          """
314          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
315          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
316          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
317            filename = self.encode(filename)
318            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
319          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
320          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
321          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
322          self.aLayer = layer_class(title, filename, fill = fill,          if attrs.has_key((None, "shapestore")):
323                                    stroke = stroke, stroke_width = stroke_width)              store = self.idmap[attrs[(None, "shapestore")]]
324      start_dispatcher['layer'] = "start_layer"          else:
325                store = self.theSession.OpenShapefile(filename)
326            self.aLayer = layer_class(title, store,
327                                      fill = fill, stroke = stroke,
328                                      lineWidth = stroke_width,
329                                      visible = visible)
330    
331      def end_layer(self, name, qname):      def end_layer(self, name, qname):
332          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
333      end_dispatcher['layer'] = "end_layer"          self.aLayer = None
334    
335        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
336            title = self.encode(attrs.get((None, 'title'), ""))
337            filename = attrs.get((None, 'filename'), "")
338            filename = os.path.join(self.GetDirectory(), filename)
339            filename = self.encode(filename)
340            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
341    
342            self.aLayer = layer_class(title, filename, visible = visible)
343    
344        def end_rasterlayer(self, name, qname):
345            self.aMap.AddLayer(self.aLayer)
346            self.aLayer = None
347    
348      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
349          self.aLayer.GetClassification().SetField(          field = attrs.get((None, 'field'), None)
350              attrs.get((None, 'field'), None))  
351      start_dispatcher['classification'] = "start_classification"          fieldType = attrs.get((None, 'field_type'), None)
352            dbFieldType = self.aLayer.GetFieldType(field)
353    
354            if fieldType != dbFieldType:
355                raise ValueError(_("xml field type differs from database!"))
356    
357            # setup conversion routines depending on the kind of data
358            # we will be seeing later on
359            if fieldType == FIELDTYPE_STRING:
360                self.conv = str
361            elif fieldType == FIELDTYPE_INT:
362                self.conv = lambda p: int(float(p))
363            elif fieldType == FIELDTYPE_DOUBLE:
364                self.conv = float
365    
366            self.aLayer.GetClassification().SetFieldInfo(field, fieldType)
367    
368      def end_classification(self, name, qname):      def end_classification(self, name, qname):
369          pass          pass
     end_dispatcher['classification'] = "end_classification"  
370    
371      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
372          self.cl_data = ClassDataDefault()          self.cl_group = ClassGroupDefault()
373          self.cl_data.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
374      start_dispatcher['clnull'] = "start_clnull"          self.cl_prop = ClassGroupProperties()
375    
376      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
377          self.aLayer.GetClassification().SetDefaultData(self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
378          del self.cl_data          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
379      end_dispatcher['clnull'] = "end_clnull"          del self.cl_group, self.cl_prop
380    
381      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
382          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
383    
384          try:          value = self.conv(attrib_value)
             value  = Str2Num(attrib_value)  
         except:  
             value  = attrib_value  
385    
386          self.cl_data = ClassDataPoint(value)          self.cl_group = ClassGroupSingleton(value)
387          self.cl_data.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
388            self.cl_prop = ClassGroupProperties()
389    
     start_dispatcher['clpoint'] = "start_clpoint"  
390    
391      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
392          self.aLayer.GetClassification().AddClassData(self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
393          del self.cl_data          self.aLayer.GetClassification().AppendGroup(self.cl_group)
394      end_dispatcher['clpoint'] = "end_clpoint"          del self.cl_group, self.cl_prop
395    
396      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
397    
398            range = attrs.get((None, 'range'), None)
399            # for backward compatibility (min/max are not saved)
400            min   = attrs.get((None, 'min'), None)
401            max   = attrs.get((None, 'max'), None)
402    
403          try:          try:
404              min = Str2Num(attrs.get((None, 'min'), "0"))              if range is not None:
405              max = Str2Num(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
406                elif min is not None and max is not None:
407                    self.cl_group = ClassGroupRange((self.conv(min),
408                                                     self.conv(max)))
409                else:
410                    self.cl_group = ClassGroupRange(Range(None))
411    
412          except ValueError:          except ValueError:
413              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
414    
415          self.cl_data = ClassDataRange(min, max)          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
416          self.cl_data.SetLabel(attrs.get((None, 'label'), ""))          self.cl_prop = ClassGroupProperties()
417    
     start_dispatcher['clrange'] = "start_clrange"  
418    
419      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
420          self.aLayer.GetClassification().AddClassData(self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
421          del self.cl_data          self.aLayer.GetClassification().AppendGroup(self.cl_group)
422      end_dispatcher['clrange'] = "end_clrange"          del self.cl_group, self.cl_prop
423    
424      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
425          self.cl_data.SetStroke(parse_color(attrs.get((None, 'stroke'), "None")))          self.cl_prop.SetLineColor(
426          self.cl_data.SetStrokeWidth(              parse_color(attrs.get((None, 'stroke'), "None")))
427            self.cl_prop.SetLineWidth(
428              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
429          self.cl_data.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
     start_dispatcher['cldata'] = "start_cldata"  
430    
431      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
432          pass          pass
     end_dispatcher['cldata'] = "end_cldata"  
   
     def start_table(self, name, qname, attrs):  
         print "table title: %s" % attrs.get('title', None)  
     start_dispatcher['table'] = "start_table"  
   
     def end_table(self, name, qname):  
         pass  
     end_dispatcher['table'] = "end_table"  
433    
434      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
435          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
436    
437      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
438          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
439          y = float(attrs[(None, 'y')])          y = float(attrs[(None, 'y')])
440          text = attrs[(None, 'text')]          text = self.encode(attrs[(None, 'text')])
441          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
442          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
443          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
     start_dispatcher['label'] = "start_label"  
444    
445      def characters(self, chars):      def characters(self, chars):
446          pass          pass
# Line 250  class ProcessSession(xml.sax.handler.Con Line 448  class ProcessSession(xml.sax.handler.Con
448    
449  def load_session(filename):  def load_session(filename):
450      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
451      dir = os.path.dirname(filename)  
452      file = open(filename)      handler = SessionLoader()
453      handler = ProcessSession(dir)      handler.read(filename)
   
     parser = make_parser()  
     parser.setContentHandler(handler)  
     parser.setErrorHandler(ErrorHandler())  
     parser.setFeature(xml.sax.handler.feature_namespaces, 1)  
     parser.parse(file)  
454    
455      session = handler.theSession      session = handler.theSession
456      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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