The Liskov/Wing paper includes a section titled Model of Computation, in which the authors spell out some but unfortunately not all of their background assumptions The present section represents my own attempt to distill out the essence of those assumptions To be more specific, the work reported in the Liskov/Wing paper is explicitly cast in an object framework, and I believe the salient features of that framework are as indicated below Objects have values different values at different times, in general, unless the object in question is immutable (see later) Objects are accessed via program variables containing pointers (ie, object IDs) Program variables are subject to assignment, but objects per se apparently aren t ( ) Objects are generally encapsulated, meaning they have behavior but no user-visible structure unless such structure is an intrinsic feature of the object type in question, as would be the case if, e.

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Not many books are available about recording audio with Free Software, except the forthcoming book on Audacity by Carla Schroder (No Starch Press). However, a great many books are available on the recording studio generally. A good all-round introduction is Practical Recording Techniques by Bruce and Jenny Bartlett (Focal Press, 2005, ISBN-13: 978-0240811444).

One of the primary advantages of data services is their use of AMF to transmit data between Flex and Java AMF is a binary protocol, and the Flash Player natively supports it Therefore, transmission using AMF is fast and efficient AMF is a high-level (application layer) protocol that uses HTTP for communication Almost all data services dialog happens over HTTP or its secure alternative, HTTPS AMF specification is now available under the open source license and is accessible for download at http://downloadmacromediacom/pub/labs/amf/amf3_spec_121207pdf When remoting, AMF is marshaled and unmarshaled at both ends (Java and Flex) for the data interchange to work The data services messaging module and media server use RTMP LCDS and FMS support RTMP, but BlazeDS does not BlazeDS uses HTTP tunneling and AMF long pooling to achieve a push-based model Red5 (http://osflash.

g, the object type in question were some array type Note: The paper doesn t actually say objects are encapsulated indeed, encapsulation as such isn t mentioned at all but I think it s at least implied Every object is of some type In fact, a given object is of exactly one type, except in the case where the object in question is of type S and type S is a proper subtype of type T, in which case the object is additionally of type T Note: I believe the second sentence here is true, although the point is nowhere spelled out explicitly in the paper Also, the term proper subtype doesn t appear, so I d better define it: Type S is a proper subtype of type T if (a) it is a subtype of T and (b) S and T are distinct.

org/red5), an open source alternative to Flash Media Server, partially reverseengineers RTMP and provides streaming capabilities over this derived protocol Apart from AMF over HTTP and RTMP, the Flash Player also supports Transmission Control Protocol (TCP) over Sockets TCP is a protocol from the Internet protocol suite that facilitates reliable ordered delivery of byte streams Secure versions of the protocol, such as AMF and HTTP over Secure Sockets Layer (SSL) and RTMP over Transport Layer Security (TLS), can be used as well Both SSL and TLS are cryptographic protocols that facilitate secure communication over the Internet TLS is a newer generation protocol compared to SSL Although similar, SSL and TLS are not interchangeable TLS 10 is a standard that emerged after SSL 30 These protocols involve endpoint authentication, message integrity, and keybased encryption Both protocols support a bunch of cryptographic algorithms including RSA.

(Note, therefore, that any given type T is a subtype of itself but not a proper one) Objects cannot change their type Note: Again, this is my assumption the paper doesn t say as much explicitly, but it does include numerous remarks that make sense only if what I ve just said is correct Objects are never destroyed Note: I think this assumption which is stated explicitly is made purely to simplify other portions of the paper, but I can t be sure Methods are bundled with types As a consequence, every method has a distinguished parameter, called in the paper (rather loosely, I feel) the method s object Mutators are methods that update the method s object, while observers are methods that don t (instead they return results ie, values, not objects, I presume of other types ( )).

All of the following software is available in Ubuntu using the Add/Remove Programs application: Audio Tag Tool (GNU/Linux): An editor for the metadata in MP3 and Ogg Vorbis files, enabling you to add or correct tags in your podcast and music releases. It can be used to edit tags one by one, or to tag and rename hundreds of files at once. http://pwp.netcabo.pt/paol/tagtool/.

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