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import re
def _validate_interface_or_name(value):
elements = value.split('.')
if len(elements) <= 1:
raise ValidationException("%s must contain at least two elements seperated by a period ('.')"%(value))
validate = re.compile('[A-Za-z][\w_]*')
for element in elements:
if not validate.match(element):
raise ValidationException("Element %s of %s has invalid characters"%(element ,value))
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