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Comments about on cardinality/multiplicity.

This commit is contained in:
David Read 2012-12-05 12:05:45 +00:00 committed by amercader
parent d2c97fe3cc
commit 46fb0030a5
1 changed files with 14 additions and 0 deletions
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14
ckanext/spatial/model/harvested_metadata.py
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@ -104,26 +104,40 @@ class MappedXmlElement(MappedXmlObject):
return etree.tostring(element, pretty_print=False)
def fix_multiplicity(self, values):
'''
When a field contains multiple values, yet the spec says
it should contain only one, then return just the first value,
rather than a list.
In the ISO19115 specification, multiplicity relates to:
* 'Association Cardinality'
* 'Obligation/Condition' & 'Maximum Occurence'
'''
if self.multiplicity == "0":
# 0 = None
if values:
raise Exception(
"Values found for element '%s': %s" % (self.name, values))
else:
return ""
elif self.multiplicity == "1":
# 1 = Mandatory, maximum 1 = Exactly one
if values:
return values[0]
else:
raise Exception(
"Value not found for element '%s'" % self.name)
elif self.multiplicity == "*":
# * = 0..* = zero or more
return values
elif self.multiplicity == "0..1":
# 0..1 = Mandatory, maximum 1 = optional (zero or one)
if values:
return values[0]
else:
return ""
elif self.multiplicity == "1..*":
# 1..* = one or more
return values
else:
raise Exception(