--- /dev/null
+# Copyright
+
+"""Classes representing relationship properties
+
+As defined in :RFC:`5545`, section 3.8.4 (Relationship Component
+Properties).
+"""
+
+from . import base as _base
+
+
+ ## RFC 5545, section 3.8.4 (Relationship Component Properties)
+ ### RFC 5545, section 3.8.4.1 (Attendee)
+ ### RFC 5545, section 3.8.4.2 (Contact)
+ ### RFC 5545, section 3.8.4.3 (Organizer)
+ ### RFC 5545, section 3.8.4.4 (Recurrence ID)
+ ### RFC 5545, section 3.8.4.5 (Related To)
+
+
+class UniformResourceLocator (_base.Property):
+ ### RFC 5545, section 3.8.4.6 (Uniform Resource Locator)
+ name = 'URL'
+ dtypes = ['URI']
+
+
+class UniqueIdentifier (_base.Property):
+ ### RFC 5545, section 3.8.4.7 (Unique Identifier)
+ name = 'UID'
+ dtypes = ['TEXT']