CAI manifest store reference

This is a work in progress may not be accurate or complete.

Doc notes from ManifestStore_schema_annotated.json are highlighted below.
See also: Additional schema questions / comments

ManifestStore

A Container for a set of Manifests and a ValidationStatus list..

Properties

Property	Type	Description	Required?
active_manifest	String	A label for the active (most recent) manifest in the store Clarify that the value of this property is the UUID of the active manifest.	NO
manifests	Object	A HashMap of Manifests See Manifest	YES
validation_status	Array of ValidationStatus	ValidationStatus generated when loading the ManifestStore from an asset	NO

Definitions

Actor
AssetType
ClaimGeneratorInfo
DataSource
DateT

HashedUri
Ingredient
Manifest
ManifestAssertion
ManifestAssertionKind

ManifestData
Metadata
Relationship
ResourceRef
ResourceStore

ReviewRating
SignatureInfo
UriOrResource
ValidationStatus

Actor

Identifies a person responsible for an action.

Property	Type	Description	Required?	Default Value
credentials	Array of HashedUri	List of references to W3C Verifiable Credentials.	NO	N/A
identifier	String	An identifier for a human actor, used when the “type” is humanEntry.identified. What “type” does this refer to?	NO	N/A

AssetType

Property	Type	Description	Required?	Default Value
type	String	Description TBD.	YES	N/A
version	String	Description TBD.	NO	N/A

ClaimGeneratorInfo

Description of the claim generator, or the software used in generating the claim. This structure is also used for actions softwareAgent What does it mean to have additionalProperties here? {: .comment}

Property	Type	Description	Required?	Default Value
icon	UriOrResource	hashed URI to the icon (either embedded or remote)	NO	N/A
name	String	A human readable string naming the claim_generator	YES	N/A
version	String	A human readable string of the product’s version	NO	N/A

NOTE: This object can have any number of additional user-defined properties.

DataSource

A description of the source for assertion data

Property	Type	Description	Required?	Default Value
actors	Array of Actor	A list of [Actor]s associated with this source. Reference-style link missing shortlink.	NO	N/A
details	String	A human-readable string giving details about the source of the assertion data.	NO	N/A
type	String	A value from among the enumerated list indicating the source of the assertion.	YES	N/A

DateT

A string.

DateT store date strings in CBOR with datetime Tag(0) This helper class should be used where the C2PA spec specifies a tagged CBOR datatime

HashedUri

Hashed Uri structure as defined by C2PA spec It is annotated to produce the correctly tagged cbor serialization Link to relevant section of spec. Spelling/capitalization issues. {: .comment}

Property	Type	Description	Required?	Default Value
alg	String	Description TBD.	NO	N/A
hash	An array of integer	Description TBD.	YES	N/A
url	String	Description TBD.	YES	N/A

Ingredient

An Ingredient is any external asset that has been used in the creation of an image.

Property	Type	Description	Required?	Default Value
active_manifest	String	The active manifest label (if one exists). If this ingredient has a [ManifestStore], this will hold the label of the active Manifest. Short links for reference-style links must be separated by newline.	NO	N/A
data	ResourceRef	A reference to the actual data of the ingredient.	NO	N/A
description	String	Additional description of the ingredient.	NO	N/A
document_id	String	Document ID from xmpMM:DocumentID in XMP metadata.	NO	N/A
format	String	The format of the source file as a MIME type.	NO	application/octet-stream
hash	String	An optional hash of the asset to prevent duplicates.	NO	N/A
informational_URI	String	URI to an informational page about the ingredient or its data.	NO	N/A
instance_id	String	Instance ID from xmpMM:InstanceID in XMP metadata.	NO	N/A
manifest_data	ResourceRef	A ManifestStore from the source asset extracted as a binary C2PA blob.	NO	N/A
metadata	Metadata	Any additional [Metadata] as defined in the C2PA spec. Reference-style link does not match shortlink: Manifest != Metadata	NO	N/A
provenance	String	URI from dcterms:provenance in XMP metadata.	NO	N/A
relationship	Relationship	Set to ParentOf if this is the parent ingredient. There can only be one parent ingredient in the ingredients.	NO	componentOf
resources	ResourceStore	No description provided If we don’t document ResourceStore, then what should we do about this property?	NO	N/A
thumbnail	ResourceRef	A thumbnail image capturing the visual state at the time of import. A tuple of thumbnail MIME format (i.e. image/jpeg) and binary bits of the image.	NO	N/A
title	String	A human-readable title, generally source filename.	YES	N/A
validation_status	Array of ValidationStatus	Validation results.	NO	N/A

Manifest

A Manifest represents all the information in a c2pa manifest. This is not a terribly helpful description. {: .comment}

Property	Type	Description	Required?	Default Value
assertions	An array of ManifestAssertion	A list of assertions Should this say an array of ManifestAssertions (with link)?	NO	Empty array
claim_generator	String	A User Agent formatted string identifying the software/hardware/system produced this claim Spaces are not allowed in names, versions can be specified with product/1.0 syntax Link to https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent?	NO	c2pa/0.25.2
claim_generator_hints	Object	No description provided. Does additionalProperties here just mean this object can have any properites?	NO	N/A
claim_generator_info	Array of ClaimGeneratorInfo	Description TBD.	NO	N/A
credentials	Array of true	A List of verified credentials The type definition is strange… An array of ‘true’?	NO	N/A
format	String	The format of the source file as a MIME type.	NO	application/octet-stream
ingredients	An array of Ingredient	A List of ingredients	NO	Empty array
instance_id	String	Instance ID from xmpMM:InstanceID in XMP metadata. What is the significance of the default value?	NO	xmp:iid:c1fcfabf-75b8-49ac-9032-34c7c6463098
label	String	Description TBD.	NO	N/A
redactions	Array of string	A list of redactions - URIs to a redacted assertions	NO	N/A
resources	ResourceStore	container for binary assets (like thumbnails) If we don’t document ResourceStore, then what should we do about this property?	NO	N/A
signature_info	SignatureInfo	Signature data (only used for reporting)	NO	N/A
thumbnail	ResourceRef	Description TBD.	NO	N/A
title	String	A human-readable title, generally source filename.	NO	N/A
vendor	String	Optional prefix added to the generated Manifest Label This is typically Internet domain name for the vendor (i.e. adobe)	NO	N/A

ManifestAssertion

A labeled container for an Assertion value in a Manifest

Property	Type	Description	Required?	Default Value
data	ManifestData	The data of the assertion as Value	YES	N/A
instance	Integer Format: uint Minimum: 0.0	There can be more than one assertion for any label So is this property just a counter? How do you know what value to use here?	NO	N/A
kind	ManifestAssertionKind	The [ManifestAssertionKind] for this assertion (as stored in c2pa content) Reference-style link missing shortlink and formatting.	NO	N/A
label	String	An assertion label in reverse domain format	YES	N/A

ManifestAssertionKind

A string that is one of the following:

“Cbor”
“Json”
“Binary”
“Uri”

ManifestData

Description TBD.

Any of the following:

true
type: integer, format: uint8, minimum: 0.0

Metadata

The Metadata structure can be used as part of other assertions or on its own to reference others What does it mean to have additionalProperties here? {: .comment}

Property	Type	Description	Required?	Default Value
data_source	DataSource	Description TBD.	NO	N/A
dateTime	DateT	Description TBD.	NO	N/A
reference	HashedUri	Description TBD.	NO	N/A
reviewRatings	Array of ReviewRating	Description TBD.	NO	N/A

NOTE: This object can have any number of additional user-defined properties.

Relationship

A string that is one of the following:

“parentOf”
“componentOf”
“inputTo”

ResourceRef

A reference to a resource to be used in JSON serialization

Property	Type	Description	Required?	Default Value
data_types	Array of AssetType	Description TBD.	NO	N/A
format	String	Description TBD.	YES	N/A
identifier	String	Description TBD.	YES	N/A

ResourceStore

Resource store to contain binary objects referenced from JSON serializable structures This should not be documented. {: .comment}

Property	Type	Description	Required?	Default Value
base_path	String	Description TBD.	NO	N/A
resources	(Object)	Description TBD.	YES	N/A

ReviewRating

A rating on an [Assertion]. See https://c2pa.org/specifications/specifications/1.0/specs/C2PA_Specification.html#_claim_review. Update spec to link to v1.3. Reference-style link missing shortlink.
{: .comment}

Property	Type	Description	Required?	Default Value
code	String	Description TBD.	NO	N/A
explanation	String	Description TBD.	YES	N/A
value	Integer Format: uint8 Minimum: 0.0	Description TBD.	YES	N/A

SignatureInfo

Holds information about a signature

Property	Type	Description	Required?	Default Value
cert_serial_number	String	The serial number of the certificate	NO	N/A
issuer	String	human readable issuing authority for this signature	NO	N/A
time	String	the time the signature was created	NO	N/A

UriOrResource

Description TBD.

Any of the following:

ResourceRef
HashedUri

ValidationStatus

A ValidationStatus struct describes the validation status of a specific part of a manifest. See https://c2pa.org/specifications/specifications/1.0/specs/C2PA_Specification.html#_existing_manifests. Maybe “struct” is not the best word to use here? Would “object” be the right JSON term? Update link to spec to v1.3. {: .comment}

Property	Type	Description	Required?	Default Value
code	String	Description TBD.	YES	N/A
explanation	String	Description TBD.	NO	N/A
url	String	Description TBD.	NO	N/A