(Cribbed heavily from the JCR Repository Model documentation)
This document describes the objects and structures that compose a Fedora repository.
A Fedora 4 repository is composed of one or more workspaces, each consisting of a directed acyclic graph of nodes where edges represent a parent-child relation.
Each persistent workspace is identified by a unique name within the repository. There is a default workspace, which has an empty workspace identifier.
Each workspace contains at least one item, the root node. The root node is the only item in the workspace without a parent node; all other items have at least one parent.
Nodes can have zero or more child nodes. Nodes can have zero or more properties. Properties can hold one or more values.
The location of an item in the workspace graph can be described by the path from the root node to that item. The path consists of the name of each interceding node in order from root to target item, much like a file system path.
The name of a item consists of the namespace prefix and a local name component. The namespace prefix must be registered before use.
The local name of a node is limited to the range of valid XML characters (http://www.w3.org/TR/xml/#NT-Char)
#x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
except
'/' | ':' | '[' | ']' | '|' | '*'
In addition to a path, every node also has an identifier. In some implementations, the identifier is independent of the path and provides an identity to the node that is stable across moves within the workspace.
Some nodes may contain a fcr:content property consisting of a binary payload with a length and digest. (These nodes are often leaf nodes in the graph).
The content of the fcr:content property is de-duplicated across the repository.
Properties may be single or multi-valued, and are typed. Some properties are reserved for internal-use only (e.g. those in the fedora-internal namespace), but can otherwise be used freely by implementors. By default, properties are multivalued string types.
