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# Data Structures
Triplet graphs similar to linked data fragments with envelopes. decoupling content addressing from versioning
- Merkel DAGs
- Envelopes
- Versioning
- Typed objects with formatting
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(Containers)=
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## Containers
- Packets of LD-triplets that contain
- Hash of triplets
- Encryption Info (if applicable)
- Permissions scope
- Signature
- Anything that can be directly referenced without local qualifier is a container.
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- Triplets within a container can be referenced with the [query syntax](qlocation)
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- Containers also behave like "feeds"
- Eg. one might put their blog posts in `@user:blog` or
- The account identifier is the top-level container.
- Ordering:
- Every triple within a scope is ordered by default by the time it is declared
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- A container can declare its ordering (see {term}`Container`)
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- Naming:
- Each container intended to be directly referenced SHOULD contain a `name` so it can be referenced w.r.t its parent: `@<ACCOUNT>:<name>`
- Each container can also be indicated numerically
- Identity: Each container is uniquely identified by the hash of its contents and the hash of the account identifier.
- Format: A container can specify one or several ways it can be displayed
- Capabilities: A container can specify different capabilities that another account can take (eg. "Like", "Upvote", "Reply")
- Capabilities should also contain a permissions scope, if none is present, the global scope is assumed.
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- Since Identities are just a special form of container, they too can advertise different actions that they support with capabilities.
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- Basically a container is a merkle DAG with binary data at its leaves a la the {index}`Linked Data; Platform`
- Re: Ordering - https://github.com/ssbc/ssb-tangle
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Re hashing a graph: the container always has one root node that is the container's identity from which a graph traversal starts. A {index}`Merkle DAG` is then constructed starting from the leaves.
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## Triplets
- Triplet format
- Objects require a shortname that can be hierarchically indexed from
- Types/Schema
- Including intrinsic notion of nesting
- every object can have blank/positionally indexed children
- every triple can have blank/positionally indexed "qualifiers" like RDF-star or wikidata's qualifiers.
## Schema
## Codecs
See IPLD Codecs and Linked Data Platform spec
Means of interacting with binary data.
Describes
- Format
-
## Versioning
- A given container has an identity hash from its first packing
- A given triple can be contained by
