Design Principles
The Handle system is designed to meet the following requirements to contribute to persistence
The identifier string:
- is not based on any changeable attributes of the entity (location, ownership, or any other attribute that may change without changing the referent’s identity);
- is opaque (preferably a ‘dumb number’: a well known pattern invites assumptions that may be misleading, and meaningful semantics may not translate across languages and may cause trademark conflicts);
- is unique within the system (to avoid collisions and referential uncertainty);
- has optional, but nice to have, features that should be supported (human-readable,cut-and-paste-able, embeddable; fits common systems, e.g., URI specification).
The identifier resolution mechanism:
- is reliable (using redundancy, no single points of failure, and fast enough to not appear broken);
- is scalable (higher loads simply managed with more computers);
- is flexible (can adapt to changing computing environments; useful to new applications):
- is trusted (both resolution and administration have technical trust methods; an operating organization is committed to the long term);
- builds on open architecture (encouraging the leverage efforts of a community in building applications on the infrastructure);
- is transparent (users need not know the infrastructure details).
Read more about this topic: Handle System
Famous quotes containing the words design and/or principles:
“Delay always breeds danger; and to protract a great design is often to ruin it.”
—Miguel De Cervantes (1547–1616)
“Now there cannot be first principles for men, unless the Divinity has revealed them; all the rest—beginning, middle, and end—is nothing but dreams and smoke.”
—Michel de Montaigne (1533–1592)