docs(query-language): reference cross-spec terminology matrix (#587)

Add a NOTE next to the FieldIdentifier root-element table that
explicitly maps each $-prefix to the corresponding Metamodel
class (IDTA-01001) and API resource path. References the new
normative terminology matrix in IDTA-01001 as the single source
of truth and states that prefixes are lower-case only.

Refs: Review Finding T-09
Made-with: Cursor

Author: aorzelskiGH

documentation/IDTA-01002-3/modules/ROOT/pages/query-language.adoc

@@ -116,6 +116,11 @@ Can start at any possible Submodel Element, is *not* restricted to Submodel Elem
 | `$smdesc` a| Starting point for fields available in Submodel Descriptors | `$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.
+====
+
 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'.