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+# LSUP tree
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+
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+`lsup_rdf`: basic graph and RDF creation, manipulation, validation,
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+de/serialization, and storage. Written in C. C and Python APIs; command-line
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+utilities.
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+
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+`lsup_repo`: repository services: organizes RDF data into "resources" made up
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+of several named graphs; framework-managed and user-defined triples;
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+resource-centric CRUD methods; binary storage and basic preservation
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+facilities; structures (containers/sets, linked lists, ORE proxies, etc.);
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+versioning, event stream. Built upon `lsup_rdf`. Written in C. C and Python
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+APIs; command-line utilities.
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+
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+`lsup_server`: REST API and read-only GUI for `lsup_repo`: browse
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+(click-through) and query (matching pattern) facilities. Likely written in
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+Python. REST API.
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+
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+
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+# Basic features of `lsup_repo`
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+
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+- Resources as collections of named graphs (by both URI pattern and linkage)
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+- Create, Read, Update, Delete a resource
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+ - Update by delta (triples to remove, by pattern; triples to add)
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+ - Update by overwriting (create-or-update approach)
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+ - Soft (bury + tombstone) and hard (forget) deletes
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+- Versioning; revert to version; resurrect or purge buried resources.
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+- Admin utilities
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+ - Blob fixity check
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+ - Repo integrity check
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+ - Referential integrity
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+ - RDF Resource integrity
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+ - Indices
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+ - Repo stats
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+ - Migrate repos
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+
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