Core building blocks

The type system is build of 35 profiles.

Type and Profile

0.FDO/Type:
- Purpose: Defines the type of the current object.
- Value:
  - Always "0.FDO/Profile" for definitions, it tells the system: "This is a profile definition."
  - Not specified for FDOs
0.FDO/Profile
- Purpose: Defines what kind of profile this is.
- Values:
  - 0.FDO/ProfileDef → a template for new profiles
  - 0.FDO/AttributeDef → a template for new attributes
  - 0.FDO/AttributeDefSyntax → for attributes with syntax rules (e.g., string, regex)
  - 0.FDO/AttributeDefProfileRef → for attributes that reference another profile
  - 0.FDO/AttributeDefAttrRef → for attributes that reference another attribute
  - 0.FDO/AttributeDefComb → for inline combinations
  - 0.FDO/AttributeDefUnion → for unions (e.g., "either A or B")
0.FDO/Root
- Purpose: All Records must validate against this profile

0.FDO/Data
- Purpose: Where the value of the attribute is stored.
- Value:
  - Always "self" for definitions
  - Reference for FDOs (uses Attribute Referencing)
0.FDO/Metadata
- Purpose: Where is the metadata located, only used in FDO instantations
- Value: inline or by reference
0.FDO/Name
- Purpose: The human-readable name of the attribute or profile.
- Value: A string (e.g., "URL", "category")
0.FDO/Description
- Purpose: A human-readable explanation of the attribute.
- Value: A string.

0.FDO/DataAsAttrRef
- Purpose: references a digital resource via an attribute reference (i.e., a PID pointing to another attribute)
- value: A PID that resolves to an attribute definition (e.g., 0.FDO/AttributeDefURL, 0.FDO/AttributeDefFile)
0.FDO/DataAsSelf
- Purpose: Indicates that the identified resource is physical or conceptual
- value: self
0.FDO/MetadataAsAttrRef
- Purpose: references a digital resource via an attribute reference (i.e., a PID pointing to another attribute)
- value: A PID that resolves to an attribute definition (e.g., 0.FDO/AttributeDefURL, 0.FDO/AttributeDefFile)
0.FDO/MetadataAsSelf
- Purpose: Indicates that the identified resource is physical or conceptual
- value: self

0.FDO/Cardinality
- Purpose: How many times this attribute can appear.
- Values:
  - 0..1 → optional, one value
  - 1..1 → required, one value
  - 0..* → optional, zero or more
  - 1..* → required, one or more
0.FDO/PrimitiveDataType
- Purpose: The basic type of the value.
- Values: "string", "number", "integer", "boolean"
0.FDO/NumericInterval
- Purpose: To define a numeric interval
- Values: form (a,b) (a,b] [a,b) or [a,b]
0.FDO/Regex
- Purpose: A regular expression to validate the value.
- Value: A string (e.g., ^https?://...)
0.FDO/Whitelist
- Purpose: A list of allowed values.
- Value: A string (e.g., "CorporateBody")
0.FDO/Blacklist
- Purpose: A list of rejected values.
- Value: A string (e.g., "admin")
0.FDO/DenyAdditionalAttributes
- Purpose: Controls whether additional attributes (not defined in the profile) are allowed.

0.FDO/ProfileDef
- Purpose: The template for creating new profiles.
- Extends: 0.FDO/Root
0.FDO/AttributeDef
- Purpose: The base template for attributes.
- Extends: 0.FDO/Root
0.FDO/AttributeDefSyntax
- Purpose: For attributes with syntax rules (e.g., string, regex).
- Extends: 0.FDO/AttributeDef
0.FDO/AttributeDefProfileRef
- Purpose: For attributes that reference another profile.
- Extends: 0.FDO/AttributeDef
0.FDO/AttributeDefAttrRef
- Purpose: For attributes that reference another attribute.
- Extends: 0.FDO/AttributeDef
0.FDO/AttributeDefComb
- Purpose: For inline combinations (e.g., "either A or B").
- Extends: 0.FDO/AttributeDef
0.FDO/AttributeDefUnion
- Purpose: For unions (e.g., "A or B").
- Extends: 0.FDO/AttributeDef

0.FDO/Extends
- Purpose: it extends the parent profile’s attributes and structure.
0.FDO/Attribute
- Purpose: it specifies which attributes are required by a profile.
0.FDO/BasicAttribute
- Purpose: used in RefinedAttribute to refernce the origin
0.FDO/RefinedAttribute
- Purpose: Allows to refine an attribute, e.g. adding cardinality