diff -r 57efd01f1715 -r 6296aa12fd71 src/p4l/models/data.py
--- a/src/p4l/models/data.py	Fri Aug 30 17:09:14 2013 +0200
+++ b/src/p4l/models/data.py	Fri Aug 30 17:58:35 2013 +0200
@@ -11,18 +11,10 @@
     imprintDate = models.CharField(max_length=512, blank=True, null=True, db_index=True)    
 
 
-class Serie(P4lModel):
+class Serie(P4lModelLang):
+    record = models.ForeignKey('p4l.Record', related_name="series")
     title = models.CharField(max_length=2048, blank=False, null=False, db_index=True)
     volume = models.CharField(max_length=2048, blank=True, null=True, db_index=True)
-    class Meta(P4lModel.Meta):
-        unique_together = ['title', 'volume']
-
-class RecordSerie(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="series+")
-    serie = models.ForeignKey('p4l.Serie', related_name="records")
-    class Meta(P4lModelLang.Meta):
-        unique_together = ['record','serie']
-
 
 
 class ProjectName(P4lModel):
@@ -33,14 +25,13 @@
 
 
 class CorporateAuthor(P4lModel):
+    record = models.ForeignKey('p4l.Record', related_name="corporateAuthors", db_index=True)
     label = models.CharField(max_length=2048, blank=False, null=False, db_index=True)
     acronym = models.CharField(max_length=2048, blank=True, null=True, db_index=True) #iiep:acronym
-    class Meta(P4lModel.Meta):
-        unique_together = ['label', 'acronym']
 
 
 class Url(P4lModel):
-    record = models.ForeignKey('p4l.Record', related_name="urls")
+    record = models.ForeignKey('p4l.Record', related_name="urls", db_index=True)
     address = models.CharField(max_length=2048, blank=False, null=False, db_index=True) #iiep:address
     display = models.CharField(max_length=2048, blank=True, null=True, db_index=True) #iiep:display
     accessLevel = models.CharField(max_length=512, blank=True, null=True, db_index=True) #iiep:accessLevel
@@ -61,16 +52,16 @@
 
 
 class Isbn(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="isbns")
+    record = models.ForeignKey('p4l.Record', related_name="isbns", db_index=True)
     isbn = models.CharField(max_length=128) #iiep:isbn
 
 
 class Issn(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="issns")
+    record = models.ForeignKey('p4l.Record', related_name="issns", db_index=True)
     issn = models.CharField(max_length=128) #iiep:issn
 
 class DocumentCode(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="documentCodes")
+    record = models.ForeignKey('p4l.Record', related_name="documentCodes", db_index=True)
     documentCode = models.CharField(max_length=128) #iiep:issn
 
 class Language(P4lModel):
@@ -85,52 +76,46 @@
         abstract = True
 
 class Title(BaseTitle):
-    record = models.ForeignKey('p4l.Record', related_name="titles")
+    record = models.ForeignKey('p4l.Record', related_name="titles", db_index=True)
 
 class AddedTitle(BaseTitle):
-    record = models.ForeignKey('p4l.Record', related_name="addedTitles")
+    record = models.ForeignKey('p4l.Record', related_name="addedTitles", db_index=True)
 
 class TitleMainDocument(BaseTitle):
-    record = models.ForeignKey('p4l.Record', related_name="titlesMainDocument")
+    record = models.ForeignKey('p4l.Record', related_name="titlesMainDocument", db_index=True)
 
 
 class Abstract(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="abstracts")
+    record = models.ForeignKey('p4l.Record', related_name="abstracts", db_index=True)
     abstract = models.TextField(blank=True, null=True)
 
 
 class Collation(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="collations")
+    record = models.ForeignKey('p4l.Record', related_name="collations", db_index=True)
     collation = models.CharField(max_length=1024, blank=False, null=False, db_index=True)
 
 
 class VolumeIssue(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="volumeIssues")
+    record = models.ForeignKey('p4l.Record', related_name="volumeIssues", db_index=True)
     volume = models.CharField(max_length=1024, blank=True, null=True, db_index=True) #iiep:volume
     number = models.CharField(max_length=1024, blank=True, null=True, db_index=True) #iiep:number
 
 
 class P4lPerson(P4lModel):
-    name = models.CharField(max_length=2048, blank=False, null=False, db_index=True, unique=True)
+    name = models.CharField(max_length=2048, blank=False, null=False, db_index=True)
     class Meta(P4lModel.Meta):
         abstract = True
 
 
 class Author(P4lPerson):
-    pass
+    record = models.ForeignKey('p4l.Record', related_name="authors", db_index=True)
     
 class SubjectPerson(P4lPerson):
-    pass
-
-
-class Periodical(P4lModel):
-    label = models.CharField(max_length=2048, blank=False, null=False, db_index=True, unique=True) #iiep:periodical
+    record = models.ForeignKey('p4l.Record', related_name="subjectPersons", db_index=True)
 
-class RecordPeriodical(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="periodicals+")
-    periodical = models.ForeignKey('p4l.Periodical', related_name="records")
-    class Meta(P4lModelLang.Meta):
-        unique_together = ['record','periodical']
+class Periodical(P4lModelLang):
+    record = models.ForeignKey('p4l.Record', related_name="periodicals", db_index=True)
+    label = models.CharField(max_length=2048, blank=False, null=False, db_index=True) #iiep:periodical
 
 
 class BaseMeeting(P4lModel):
@@ -141,21 +126,15 @@
     meetingYear = models.PositiveSmallIntegerField(blank=True, null=True, db_index=True) #iiep:meetingYear
     class Meta(P4lModel.Meta):
         abstract = True
-        unique_together = ['label', 'meetingNumber', 'meetingPlace', 'meetingDate', 'meetingYear']
 
 
 class Meeting(BaseMeeting):
-    pass
-
-class RecordMeeting(P4lModelLang):
-    record = models.ForeignKey('p4l.Record', related_name="meetings+")
-    meeting = models.ForeignKey('p4l.Meeting', related_name="records")
-    class Meta(P4lModelLang.Meta):
-        unique_together = ['record','meeting']
+    lang = models.CharField(max_length=15, blank=True, null=True, db_index=True) #@xml:lang
+    record = models.ForeignKey('p4l.Record', related_name="meetings")
 
 
 class SubjectMeeting(BaseMeeting):
-    pass
+    record = models.ForeignKey('p4l.Record', related_name="subjectMeetings", db_index=True)
 
 
 class CorporateBody(P4lModel):
@@ -177,6 +156,7 @@
     language = models.ForeignKey('p4l.Language', blank=True, null=True) #dct:language                                    # Language
     otherLanguages = models.ManyToManyField('p4l.Language', related_name='otherLanguage_record') #iiep:otherLanguage     # Language
     #titles foreign Key from Title #dct:title
+    #abstracts foreign Key from Abstract #dct:abstract
     #addedTitles foreign Key from AddedTitle #iiep:addedTitle
     #titlesMainDocument foreign Key from TitleMainDocument #iiep:titleMainDocument
     editionStatement = models.CharField(max_length=1024, blank=True, null=True) #iiep:editionStatement
@@ -184,14 +164,14 @@
     #collations = foreign Key from Collation #iiep:collation
     #volumeIssues = foreign Key from VolumeIssue #iiep:volumeIssue
     projectNames = models.ManyToManyField('p4l.ProjectName') #iiep:projectName
-    periodicals = models.ManyToManyField('p4l.Periodical', through='p4l.RecordPeriodical') #iiep:periodical
-    meetings = models.ManyToManyField('p4l.Meeting', through='p4l.RecordMeeting') #iiep:meeting
-    series = models.ManyToManyField('p4l.Serie', through='p4l.RecordSerie')  #iiep:serie
-    authors = models.ManyToManyField('p4l.Author') #iiep:author
-    subjectPersons = models.ManyToManyField('p4l.SubjectPerson') #iiep:subjectPerson
+    #periodicals = foreign key from 'p4l.Periodical' #iiep:periodical
+    #meetings = foreign key from 'p4l.Meeting' #iiep:meeting
+    #series = foreign key from 'p4l.Serie'  #iiep:serie
+    #authors = foreign key from 'p4l.Author' #iiep:author
+    #subjectPersons = foreign key from 'p4l.SubjectPerson' #iiep:subjectPerson
     subjectCorporateBodies = models.ManyToManyField('p4l.CorporateBody') #iiep:subjectCorporateBody                       # Organisation ?
-    subjectMeetings = models.ManyToManyField('p4l.SubjectMeeting') #iiep:subjectMeeting
-    corporateAuthors = models.ManyToManyField('p4l.CorporateAuthor') #iiep:corporateAuthor                                # Organisation ?
+    #subjectMeetings = foreign key from 'p4l.SubjectMeeting' #iiep:subjectMeeting
+    #corporateAuthors = foreign key from 'p4l.CorporateAuthor' #iiep:corporateAuthor                                # Organisation ?
     #urls foreign Key from Url #iiep:url
     recordType = models.URLField(max_length=2048) #dct:type
     isDocumentPart = models.BooleanField() #iiep:isDocumentPart