web/views/owl.py
author Nicolas Chauvat <nicolas.chauvat@logilab.fr>
Mon, 25 May 2009 16:03:32 +0200
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"""produces some Ontology Web Language schema and views
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:organization: Logilab
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:copyright: 2008-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from logilab.mtconverter import TransformError, xml_escape
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from cubicweb.view import StartupView, EntityView
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from cubicweb.web.action import Action
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from cubicweb.selectors import none_rset, match_view
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_ = unicode
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OWL_CARD_MAP = {'1': '<rdf:type rdf:resource="&owl;FunctionalProperty"/>',
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                '?': '<owl:maxCardinality rdf:datatype="&xsd;int">1</owl:maxCardinality>',
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                '+': '<owl:minCardinality rdf:datatype="&xsd;int">1</owl:minCardinality>',
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                '*': ''
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                }
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OWL_TYPE_MAP = {'String': 'xsd:string',
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                'Datetime': 'xsd:dateTime',
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                'Bytes': 'xsd:byte',
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                'Float': 'xsd:float',
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                'Boolean': 'xsd:boolean',
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                'Int': 'xsd:int',
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                'Date':'xsd:date',
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                'Time': 'xsd:time',
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                'Password': 'xsd:byte',
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                'Decimal' : 'xsd:decimal',
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                'Interval': 'xsd:duration'
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                }
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OWL_OPENING_ROOT = u'''<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE rdf:RDF [
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        <!ENTITY owl "http://www.w3.org/2002/07/owl#" >
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        <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
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]>
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
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    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
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    xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
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    xmlns:owl="http://www.w3.org/2002/07/owl#"
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    xmlns="http://logilab.org/owl/ontologies/%(appid)s#"
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    xmlns:%(appid)s="http://logilab.org/owl/ontologies/%(appid)s#"
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    xmlns:base="http://logilab.org/owl/ontologies/%(appid)s">
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  <owl:Ontology rdf:about="">
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    <rdfs:comment>
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    %(appid)s Cubicweb OWL Ontology
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    </rdfs:comment>
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  </owl:Ontology>'''
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OWL_CLOSING_ROOT = u'</rdf:RDF>'
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DEFAULT_SKIP_RELS = frozenset(('is', 'is_instance_of', 'identity',
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                               'owned_by', 'created_by'))
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class OWLView(StartupView):
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    """This view export in owl format schema database. It is the TBOX"""
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    id = 'owl'
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    title = _('owl')
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    templatable = False
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    content_type = 'application/xml' # 'text/xml'
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    def call(self, writeprefix=True):
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        skipmeta = int(self.req.form.get('skipmeta', True))
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        if writeprefix:
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            self.w(OWL_OPENING_ROOT % {'appid': self.schema.name})
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        self.visit_schema(skipmeta=skipmeta)
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        if writeprefix:
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            self.w(OWL_CLOSING_ROOT)
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    def visit_schema(self, skiprels=DEFAULT_SKIP_RELS, skipmeta=True):
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        """get a layout for a whole schema"""
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        entities = sorted([eschema for eschema in self.schema.entities()
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                           if not eschema.is_final()])
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        if skipmeta:
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            entities = [eschema for eschema in entities
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                        if not eschema.meta]
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        self.w(u'<!-- classes definition -->')
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        for eschema in entities:
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            self.visit_entityschema(eschema, skiprels)
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            self.w(u'<!-- property definition -->')
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            self.visit_property_schema(eschema, skiprels)
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            self.w(u'<!-- datatype property -->')
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            self.visit_property_object_schema(eschema)
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    def visit_entityschema(self, eschema, skiprels=()):
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        """get a layout for an entity OWL schema"""
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        self.w(u'<owl:Class rdf:ID="%s">'% eschema)
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        self.w(u'<!-- relations -->')
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        for rschema, targetschemas, role in eschema.relation_definitions():
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            if rschema.type in skiprels:
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    96
                continue
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    97
            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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    98
                continue
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    99
            for oeschema in targetschemas:
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                label = rschema.type
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   101
                if role == 'subject':
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                    card = rschema.rproperty(eschema, oeschema, 'cardinality')[0]
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   103
                else:
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                    card = rschema.rproperty(oeschema, eschema, 'cardinality')[1]
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                cardtag = OWL_CARD_MAP[card]
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   106
                if cardtag:
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   107
                    self.w(u'''<rdfs:subClassOf>
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 <owl:Restriction>
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  <owl:onProperty rdf:resource="#%s"/>
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  %s
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 </owl:Restriction>
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</rdfs:subClassOf>
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''' % (label, cardtag))
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   114
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   115
        self.w(u'<!-- attributes -->')
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        for rschema, aschema in eschema.attribute_definitions():
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            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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                continue
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            aname = rschema.type
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            if aname == 'eid':
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                continue
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            self.w(u'''<rdfs:subClassOf>
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  <owl:Restriction>
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   <owl:onProperty rdf:resource="#%s"/>
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   <rdf:type rdf:resource="&owl;FunctionalProperty"/>
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  </owl:Restriction>
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</rdfs:subClassOf>'''
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                   % aname)
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        self.w(u'</owl:Class>')
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    def visit_property_schema(self, eschema, skiprels=()):
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        """get a layout for property entity OWL schema"""
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        for rschema, targetschemas, role in eschema.relation_definitions():
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            if rschema.type in skiprels:
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   136
                continue
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            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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   138
                continue
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            for oeschema in targetschemas:
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                label = rschema.type
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   141
                self.w(u'''<owl:ObjectProperty rdf:ID="%s">
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 <rdfs:domain rdf:resource="#%s"/>
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 <rdfs:range rdf:resource="#%s"/>
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</owl:ObjectProperty>
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''' % (label, eschema, oeschema.type))
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   146
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   147
    def visit_property_object_schema(self, eschema):
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        for rschema, aschema in eschema.attribute_definitions():
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   149
            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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   150
                continue
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            aname = rschema.type
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            if aname == 'eid':
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   153
                continue
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   154
            self.w(u'''<owl:DatatypeProperty rdf:ID="%s">
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  <rdfs:domain rdf:resource="#%s"/>
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  <rdfs:range rdf:resource="%s"/>
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   157
</owl:DatatypeProperty>'''
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   158
                   % (aname, eschema, OWL_TYPE_MAP[aschema.type]))
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   159
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   160
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   161
class OWLABOXView(EntityView):
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    '''This view represents a part of the ABOX for a given entity.'''
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    id = 'owlabox'
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    title = _('owlabox')
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    templatable = False
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   167
    content_type = 'application/xml' # 'text/xml'
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    def call(self):
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        self.w(OWL_OPENING_ROOT % {'appid': self.schema.name})
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        for i in xrange(self.rset.rowcount):
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            self.cell_call(i, 0)
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        self.w(OWL_CLOSING_ROOT)
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   174
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   175
    def cell_call(self, row, col, skiprels=DEFAULT_SKIP_RELS):
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        self.wview('owlaboxitem', self.rset, row=row, col=col, skiprels=skiprels)
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   177
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class OWLABOXItemView(EntityView):
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    '''This view represents a part of the ABOX for a given entity.'''
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    id = 'owlaboxitem'
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    templatable = False
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    content_type = 'application/xml' # 'text/xml'
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   184
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    def cell_call(self, row, col, skiprels=DEFAULT_SKIP_RELS):
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        entity = self.complete_entity(row, col)
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        eschema = entity.e_schema
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        self.w(u'<%s rdf:ID="%s">' % (eschema, entity.eid))
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        self.w(u'<!--attributes-->')
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        for rschema, aschema in eschema.attribute_definitions():
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            if rschema.type in skiprels:
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                continue
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            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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                continue
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            aname = rschema.type
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            if aname == 'eid':
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                continue
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            try:
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                attr = entity.printable_value(aname, format='text/plain')
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                if attr:
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                    self.w(u'<%s>%s</%s>' % (aname, xml_escape(attr), aname))
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            except TransformError:
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                pass
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        self.w(u'<!--relations -->')
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        for rschema, targetschemas, role in eschema.relation_definitions():
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            if rschema.type in skiprels:
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                continue
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            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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                continue
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            if role == 'object':
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                attr = 'reverse_%s' % rschema.type
502
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            else:
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                attr = rschema.type
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            for x in getattr(entity, attr):
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                self.w(u'<%s>%s %s</%s>' % (attr, x.id, x.eid, attr))
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        self.w(u'</%s>'% eschema)
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class DownloadOWLSchemaAction(Action):
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    id = 'download_as_owl'
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    __select__ = none_rset() & match_view('schema')
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   222
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    category = 'mainactions'
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    title = _('download schema as owl')
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   225
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    def url(self):
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        return self.build_url('view', vid='owl')