diff --git a/packages/core/src/core/Types/src/data-map.ts b/packages/core/src/core/Types/src/data-map.ts
index 30ae4e3c..c5b897a3 100644
--- a/packages/core/src/core/Types/src/data-map.ts
+++ b/packages/core/src/core/Types/src/data-map.ts
@@ -45,7 +45,9 @@ export class DataMap<K, V> extends Map<K, V> {
   }
 
   /**
-   * Sets the value for the specified key in the map and triggers the appropriate event (onItemSet or onItemUpdated).
+   * Sets the value for the specified key in the map.
+   * If the item is new, then onItemSet is triggered.
+   * If the item is already in the map, then onItemUpdated is triggered.
    *
    * @param key - The key of the item to set.
    * @param value - The value of the item to set.
diff --git a/packages/core/src/openbim/IDSSpecifications/index.ts b/packages/core/src/openbim/IDSSpecifications/index.ts
index 9261d965..babe563b 100644
--- a/packages/core/src/openbim/IDSSpecifications/index.ts
+++ b/packages/core/src/openbim/IDSSpecifications/index.ts
@@ -82,7 +82,7 @@ export class IDSSpecifications extends Component {
       ifcVersion,
     );
 
-    if (identifier) specification.identifier = identifier;
+    if (identifier) (specification.identifier as any) = identifier;
     this.list.set(specification.identifier, specification);
     return specification;
   }
diff --git a/packages/core/src/openbim/IDSSpecifications/src/Specification.ts b/packages/core/src/openbim/IDSSpecifications/src/Specification.ts
index c5e11b78..fa5935f5 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/Specification.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/Specification.ts
@@ -1,9 +1,10 @@
 import * as FRAGS from "@thatopen/fragments";
 import { Components } from "../../../core/Components";
 import { DataSet } from "../../../core/Types";
-import { IDSCheckResult, IfcVersion } from "./types";
+import { IDSCheckResult, IDSSpecificationData, IfcVersion } from "./types";
 import { UUID } from "../../../utils";
 import { IDSFacet } from "./facets";
+import { IDSSpecifications } from "..";
 
 /**
  * Represents a single specification from the Information Delivery Specification (IDS) standard.
@@ -11,10 +12,10 @@ import { IDSFacet } from "./facets";
  * @remarks This class provides methods for testing a model against the specification,
  * as well as serializing the specification into XML format.
  */
-export class IDSSpecification {
+export class IDSSpecification implements IDSSpecificationData {
   name: string;
   ifcVersion = new Set<IfcVersion>();
-  identifier = UUID.create();
+  readonly identifier = UUID.create();
   description?: string;
   instructions?: string;
   requirementsDescription?: string;
@@ -31,6 +32,19 @@ export class IDSSpecification {
     }
   }
 
+  set(data: Partial<IDSSpecificationData>) {
+    const _data = data as any;
+    const _this = this as any;
+    for (const key in data) {
+      if (key === "identifier") continue;
+      const value = _data[key];
+      if (key in this) _this[key] = value;
+    }
+    const manager = this.components.get(IDSSpecifications);
+    manager.list.set(this.identifier, this);
+    return this;
+  }
+
   /**
    * Tests the model to test against the specification's requirements.
    *
diff --git a/packages/core/src/openbim/IDSSpecifications/src/exporters/parameter.ts b/packages/core/src/openbim/IDSSpecifications/src/exporters/parameter.ts
index 02c357d0..0ac43193 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/exporters/parameter.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/exporters/parameter.ts
@@ -1,9 +1,4 @@
-import {
-  IDSFacetParameterName,
-  IDSFacetParameter,
-  IDSEnumerationParameter,
-  IDSPatternParameter,
-} from "../types";
+import { IDSFacetParameterName, IDSFacetParameter } from "../types";
 
 export const getParameterXML = (
   name: IDSFacetParameterName,
@@ -16,14 +11,14 @@ export const getParameterXML = (
   }
 
   if (parameter.type === "enumeration") {
-    const value = parameter.parameter as IDSEnumerationParameter;
+    const value = parameter.parameter;
     parameterXML = `<xs:restriction base="xs:string">
     ${value.map((v) => `<xs:enumeration value="${v}" />`).join("\r\n")}
     </xs:restriction>`;
   }
 
   if (parameter.type === "pattern") {
-    const value = parameter.parameter as IDSPatternParameter;
+    const value = parameter.parameter;
     parameterXML = `<xs:restriction base="xs:string">
       <xs:pattern value="${value}" />
     </xs:restriction>`;
diff --git a/packages/core/src/openbim/IDSSpecifications/src/facets/Attribute.ts b/packages/core/src/openbim/IDSSpecifications/src/facets/Attribute.ts
index 10965a71..6734cf34 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/facets/Attribute.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/facets/Attribute.ts
@@ -7,6 +7,7 @@ import { getParameterXML } from "../exporters/parameter";
 // https://github.com/buildingSMART/IDS/blob/development/Documentation/UserManual/attribute-facet.md
 
 export class IDSAttribute extends IDSFacet {
+  facetType = "Attribute" as const;
   name: IDSFacetParameter;
   value?: IDSFacetParameter;
 
diff --git a/packages/core/src/openbim/IDSSpecifications/src/facets/Classification.ts b/packages/core/src/openbim/IDSSpecifications/src/facets/Classification.ts
index b2ef5fc6..c236f3b4 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/facets/Classification.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/facets/Classification.ts
@@ -9,6 +9,7 @@ import { getParameterXML } from "../exporters/parameter";
 // https://github.com/buildingSMART/IDS/blob/development/Documentation/UserManual/classification-facet.md
 
 export class IDSClassification extends IDSFacet {
+  facetType = "Classification" as const;
   system: IDSFacetParameter;
   value?: IDSFacetParameter;
   uri?: string;
diff --git a/packages/core/src/openbim/IDSSpecifications/src/facets/Entity.ts b/packages/core/src/openbim/IDSSpecifications/src/facets/Entity.ts
index 675de0a8..319ac1fb 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/facets/Entity.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/facets/Entity.ts
@@ -8,6 +8,7 @@ import { getParameterXML } from "../exporters/parameter";
 // https://github.com/buildingSMART/IDS/blob/development/Documentation/UserManual/entity-facet.md
 
 export class IDSEntity extends IDSFacet {
+  facetType = "Entity" as const;
   name: IDSFacetParameter;
   predefinedType?: IDSFacetParameter;
 
diff --git a/packages/core/src/openbim/IDSSpecifications/src/facets/Facet.ts b/packages/core/src/openbim/IDSSpecifications/src/facets/Facet.ts
index 01d2c021..3ecc948b 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/facets/Facet.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/facets/Facet.ts
@@ -4,17 +4,15 @@ import {
   IDSFacetParameter,
   IDSCheckResult,
   IDSFacetParameterName,
-  IDSSimpleParameter,
-  IDSEnumerationParameter,
-  IDSPatternParameter,
-  IDSLengthParameter,
-  IDSBoundsParameter,
   IDSCheck,
   IDSConditionalCardinaltiy,
   IDSSimpleCardinality,
+  IDSFacetType,
 } from "../types";
 
 export abstract class IDSFacet {
+  abstract facetType: IDSFacetType;
+
   // Used when the facet is a requirement
   // On IDSEntity is always required
   cardinality: IDSSimpleCardinality | IDSConditionalCardinaltiy = "required";
@@ -54,24 +52,20 @@ export abstract class IDSFacet {
     let pass = false;
 
     if (facetParameter.type === "simple") {
-      const parameter = facetParameter.parameter as IDSSimpleParameter;
-      pass = value === parameter;
+      pass = value === facetParameter.parameter;
     }
 
     if (facetParameter.type === "enumeration") {
-      const parameter = facetParameter.parameter as IDSEnumerationParameter;
-      pass = parameter.includes(value as never);
+      pass = facetParameter.parameter.includes(value as never);
     }
 
     if (facetParameter.type === "pattern") {
-      const parameter = facetParameter.parameter as IDSPatternParameter;
-      const regex = new RegExp(parameter);
+      const regex = new RegExp(facetParameter.parameter);
       pass = regex.test(String(value));
     }
 
     if (facetParameter.type === "length") {
-      const parameter = facetParameter.parameter as IDSLengthParameter;
-      const { min, length, max } = parameter;
+      const { min, length, max } = facetParameter.parameter;
       if (length !== undefined) {
         pass = String(value).length === length;
       }
@@ -84,8 +78,7 @@ export abstract class IDSFacet {
     }
 
     if (facetParameter.type === "bounds" && typeof value === "number") {
-      const { min, minInclusive, max, maxInclusive } =
-        facetParameter.parameter as IDSBoundsParameter;
+      const { min, minInclusive, max, maxInclusive } = facetParameter.parameter;
 
       let minPass = true;
       let maxPass = true;
diff --git a/packages/core/src/openbim/IDSSpecifications/src/facets/Material.ts b/packages/core/src/openbim/IDSSpecifications/src/facets/Material.ts
index 4248d285..1b170f14 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/facets/Material.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/facets/Material.ts
@@ -5,6 +5,7 @@ import { IDSFacet } from "./Facet";
 // https://github.com/buildingSMART/IDS/blob/development/Documentation/UserManual/material-facet.md
 
 export class IdsMaterialFacet extends IDSFacet {
+  facetType = "Material" as const;
   value?: IDSFacetParameter;
   uri?: string;
 
diff --git a/packages/core/src/openbim/IDSSpecifications/src/facets/PartOf.ts b/packages/core/src/openbim/IDSSpecifications/src/facets/PartOf.ts
index f27c74db..8d301a70 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/facets/PartOf.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/facets/PartOf.ts
@@ -12,6 +12,8 @@ import { IDSEntity } from "./Entity";
 // https://github.com/buildingSMART/IDS/blob/development/Documentation/UserManual/partof-facet.md
 
 export class IDSPartOf extends IDSFacet {
+  facetType = "PartOf" as const;
+
   private _entityFacet: IDSEntity;
 
   private _entity: {
diff --git a/packages/core/src/openbim/IDSSpecifications/src/facets/Property.ts b/packages/core/src/openbim/IDSSpecifications/src/facets/Property.ts
index d453955c..62a46441 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/facets/Property.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/facets/Property.ts
@@ -9,6 +9,7 @@ import { getParameterXML } from "../exporters/parameter";
 // https://github.com/buildingSMART/IDS/blob/development/Documentation/UserManual/property-facet.md
 
 export class IDSProperty extends IDSFacet {
+  facetType = "Property" as const;
   propertySet: IDSFacetParameter;
   baseName: IDSFacetParameter;
   value?: IDSFacetParameter;
diff --git a/packages/core/src/openbim/IDSSpecifications/src/importers/parameter.ts b/packages/core/src/openbim/IDSSpecifications/src/importers/parameter.ts
index 83ff27e3..291952cc 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/importers/parameter.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/importers/parameter.ts
@@ -2,8 +2,9 @@ import { IDSFacetParameter } from "../types";
 
 export const getParameterValue = (property: any) => {
   if (!property) return undefined;
-  const result: Partial<IDSFacetParameter> = { type: "simple" };
+  const result: Partial<IDSFacetParameter> = {};
   if ("simpleValue" in property) {
+    result.type = "simple";
     result.parameter = property.simpleValue;
   }
   if ("restriction" in property) {
diff --git a/packages/core/src/openbim/IDSSpecifications/src/types.ts b/packages/core/src/openbim/IDSSpecifications/src/types.ts
index 8857f539..18e3dcc8 100644
--- a/packages/core/src/openbim/IDSSpecifications/src/types.ts
+++ b/packages/core/src/openbim/IDSSpecifications/src/types.ts
@@ -13,46 +13,62 @@ export type IDSFacetParameterName =
   | "Entity"
   | "Relation";
 
+export type IDSFacetType =
+  | "Entity"
+  | "Attribute"
+  | "Property"
+  | "Classification"
+  | "Material"
+  | "PartOf";
+
 // required must match
 // prohibited mustn't match
 // optional passes for matches and nulls
 export type IDSSimpleCardinality = "required" | "prohibited";
 export type IDSConditionalCardinaltiy = IDSSimpleCardinality | "optional";
 
-export type IDSSimpleParameter = string | number | boolean;
-export type IDSEnumerationParameter = string[] | number[] | boolean[];
-export type IDSPatternParameter = string;
-export type IDSBoundsParameter = {
-  min?: number;
-  minInclusive?: boolean;
-  max?: number;
-  maxInclusive?: boolean;
-};
-export type IDSLengthParameter = {
-  min?: number;
-  length?: number;
-  max?: number;
-};
+export interface IDSSimpleParameter {
+  type: "simple";
+  parameter: string | number | boolean;
+}
+
+export interface IDSEnumerationParameter {
+  type: "enumeration";
+  parameter: string[] | number[] | boolean[];
+}
 
-export interface IDSRestrictionParameter {}
+export interface IDSPatternParameter {
+  type: "pattern";
+  parameter: string;
+}
 
-export type IDSFacetParameterType =
-  | "simple"
-  | "enumeration"
-  | "pattern"
-  | "bounds"
-  | "length";
+export interface IDSBoundsParameter {
+  type: "bounds";
+  parameter: {
+    min?: number;
+    minInclusive?: boolean;
+    max?: number;
+    maxInclusive?: boolean;
+  };
+}
 
-export interface IDSFacetParameter {
-  type: IDSFacetParameterType;
-  parameter:
-    | IDSSimpleParameter
-    | IDSEnumerationParameter
-    | IDSPatternParameter
-    | IDSBoundsParameter
-    | IDSLengthParameter;
+export interface IDSLengthParameter {
+  type: "length";
+  parameter: {
+    min?: number;
+    length?: number;
+    max?: number;
+  };
 }
 
+export type IDSRestrictionParameter =
+  | IDSEnumerationParameter
+  | IDSPatternParameter
+  | IDSBoundsParameter
+  | IDSLengthParameter;
+
+export type IDSFacetParameter = IDSSimpleParameter | IDSRestrictionParameter;
+
 export interface IDSCheck {
   parameter: IDSFacetParameterName;
   currentValue: string | number | boolean | null;
@@ -81,3 +97,12 @@ export interface IDSInfo {
   purpose?: string;
   milestone?: string;
 }
+
+export interface IDSSpecificationData {
+  name: string;
+  ifcVersion: Set<IfcVersion>;
+  identifier: string;
+  description?: string;
+  instructions?: string;
+  requirementsDescription?: string;
+}