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Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,11 @@
| `$smdesc` a| Starting point for fields available in Submodel Descriptors | `$smdesc#endpoints[0].protocolinformation.href`
|===

[NOTE]
====
The prefixes `$aas`, `$sm`, `$sme`, `$cd`, `$aasdesc` and `$smdesc` correspond directly to the AAS Metamodel classes `AssetAdministrationShell`, `Submodel`, `SubmodelElement`, `ConceptDescription`, `AssetAdministrationShellDescriptor` and `SubmodelDescriptor`, and to the API resources `/shells`, `/submodels`, `.../submodel-elements/{idShortPath}`, `/concept-descriptions`, `/shell-descriptors` and `/submodel-descriptors` respectively. The normative cross-specification mapping is given in the "Terminology Across IDTA-01001, IDTA-01002 and IDTA-01004" section of IDTA-01001 (AAS Metamodel). All prefixes are lower-case; variants such as `$aasDesc` or `$SmDesc` MUST be rejected by conforming parsers.

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====

Attribute declarations point to literal values that provide the input for comparisons. It is not possible to point to objects or lists, only atomic values. Attribute declarations present a subset of the attributes defined by the AAS Metamodel and the extension classes of Clause xref:specification/interfaces-payload.adoc[Data Types for Payload].

.Attribute Elements for Field Identifiers. `<index>` is an optional nonNegativeInteger value. No `<index>` shall be interpreted as 'anywhere in the list'.
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