what does XACML Identifier mean?

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for example,"urn:oasis:names:tc:xacml:1.0:subject:session-start-time",what does it mean? How can i know the format of the session-start-time? Is it yyyy-MM-dd or yyyy/MM/dd? I can't find any Information form the oasis's document.SomeOne tell please,thx.

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craigforster On

The session-start-time attribute would represent when the session for the user identified in subject-id started. This is likely when the user authenticated, I guess.

While the spec doesn't explicitly say what DataType the attribute is, I would assume that it's the http://www.w3.org/2001/XMLSchema#dateTime type.

You can find the definition of this type here: http://www.w3.org/TR/xmlschema-2/#dateTime; an example being "2002-10-10T12:00:00-05:00"