Abstracts storage backend e.g. filesystem.
There might be platforms that have no chance to directly access file system
e.g. iOS, and in that case the concept of repository makes you to store
data directly to Dropbox or Google Drive instead of filesystem.
However in the most cases we will simply use FileSystemRepository even if
data are synchronized using Dropbox or rsync.
| Bytes |
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| Repository |
Repository interface agnostic to its underlying storage implementation.
Stage objects can deal with documents to be stored using the interface.
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| ToRepository |
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