RFC 2079 (rfc2079) - Page 2 of 5
Definition of an X
Alternative Format: Original Text Document
RFC 2079 URI Attribute Type and Object Class January 1997
Schema Definition of the labeledURI Attribute Type
Name: labeledURI
ShortName: None
Description: Uniform Resource Identifier with optional label
OID: umichAttributeType.57 (1.3.6.1.4.1.250.1.57)
Syntax: caseExactString
SizeRestriction: None
SingleValued: False
Discussion of the labeledURI Attribute Type
The labeledURI attribute type has the caseExactString syntax (since
URIs are case-sensitive) and it is multivalued. Values placed in the
attribute should consist of a URI (at the present time, a URL)
optionally followed by one or more space characters and a label.
Since space characters are not allowed to appear un-encoded in URIs,
there is no ambiguity about where the label begins. At the present
time, the URI portion must comply with the URL specification [1].
Multiple labeledURI values will generally indicate different
resources that are all related to the X.500 object, but may indicate
different locations for the same resource.
The label is used to describe the resource to which the URI points,
and is intended as a friendly name fit for human consumption. This
document does not propose any specific syntax for the label part. In
some cases it may be helpful to include in the label some indication
of the kind and/or size of the resource referenced by the URI.
Note that the label may include any characters allowed by the
caseExactString syntax, but that the use of non-IA5 (non-ASCII)
characters is discouraged as not all directory clients may handle
them in the same manner. If non-IA5 characters are included, they
should be represented using the X.500 conventions, not the HTML
conventions (e.g., the character that is an "a" with a ring above it
should be encoded using the T.61 sequence 0xCA followed by an "a"
character; do not use the HTML escape sequence "å").
Examples of labeledURI Attribute Values
An example of a labeledURI attribute value that does not include a
label:
ftp://ds.internic.net/rfc/rfc822.txt
Smith Standards Track