RFC 2938 (rfc2938) - Page 2 of 18
Identifying Composite Media Features
Alternative Format: Original Text Document
RFC 2938 Identifying Composite Media Features September 2000
9. Authors' Addresses .........................................15
10. Appendix A: The birthday paradox ...........................16
11. Full Copyright Statement ...................................18
1. Introduction
In "A Syntax for Describing Media Feature Sets" [1], an expression
format is presented for describing media feature capabilities as a
combination of simple media feature tags [2].
This document proposes an abbreviated format for a composite media
feature set, based upon a hash of the feature expression describing
that composite.
This memo extends and builds upon the expression syntax described in
RFC 2533 [1], and it is assumed that the reader is familiar with the
interpretation of feature set expressions described there.
1.1 Organization of this document
Section 2 sets out some of the background and goals for feature set
references.
Section 3 presents a syntax for feature set references, and describes
how they are related to feature set expressions.
1.2 Terminology and document conventions
This section defines a number of terms and other document
conventions, which are used with specific meaning in this memo. The
terms are listed in alphabetical order.
dereference
the act of replacing a feature set reference with its
corresponding feature set expression. Also called
"resolution".
feature set
some set of media features described by a media feature
assertion, as described in "A Syntax for Describing Media
Feature Sets" [1]. (See that memo for a more formal
definition of this term.)
feature set expression
a string that describes some feature set, formulated
according to the rules in "A Syntax for Describing Media
feature sets" [1] (and possibly extended by other
specifications).
Klyne & Masinter Standards Track