
Section 3.0 The Rivendell Library Structure and RDLibrary
3.0.0 Carts
The Rivendell Library consists of a set of objects called carts. A cart is a data container
that holds either one or more pieces of audio (called an audio cart), or macro commands
to the system (called a macro cart). The cart is the fundamental schedule building block
in Rivendell, in that it is the smallest object or 'atom' that the outside world (like a traffic
or music scheduler) can see.
RDLibrary, upon startup, will show the current list of all carts on the system, as in
Illustration 2 below:
Illustration 2: The RDLibrary Cart List
A number of important attributes of carts can be seen from this illustration. First is the
cart's number. Each cart in the Library gets assigned a unique number when it is created.
This number can range between 000001 and 999999, and is the primary 'handle' by which
both Rivendell and external systems (like traffic or music schedulers) refer to the cart.
Very often, sites have specific rules concerning which types of audio (commercials,
promos, music, etc) and macros get assigned which numbers. We'll cover this area in
some detail when we discuss groups.
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