diff --git a/apps/dnet-is-application/src/main/java/eu/dnetlib/is/resource/ResourceAjaxController.java b/apps/dnet-is-application/src/main/java/eu/dnetlib/is/resource/ResourceAjaxController.java
index e154e2f8..a9ec2707 100644
--- a/apps/dnet-is-application/src/main/java/eu/dnetlib/is/resource/ResourceAjaxController.java
+++ b/apps/dnet-is-application/src/main/java/eu/dnetlib/is/resource/ResourceAjaxController.java
@@ -25,11 +25,12 @@ public class ResourceAjaxController extends AbstractResourceController {
 	@PostMapping("/")
 	public SimpleResource newResource(@RequestParam final String name,
 		@RequestParam final String type,
+		@RequestParam(required = false, defaultValue = "") final String subtype,
 		@RequestParam(required = false, defaultValue = "") final String description,
 		@RequestParam final String content)
 		throws InformationServiceException {
 
-		return service.saveNewResource(name, type, description, content);
+		return service.saveNewResource(name, type, subtype, description, content);
 	}
 
 	@DeleteMapping("/{resId}")
diff --git a/frontends/dnet-is-application/src/app/common/is.model.ts b/frontends/dnet-is-application/src/app/common/is.model.ts
index 1da787c2..7ea47b6f 100644
--- a/frontends/dnet-is-application/src/app/common/is.model.ts
+++ b/frontends/dnet-is-application/src/app/common/is.model.ts
@@ -54,6 +54,7 @@ export interface SimpleResource {
 	id: string,
 	name: string,
 	type: string,
+	subtype?: string,
 	description?: string,
 	creationDate?: string,
 	modificationDate?: string
diff --git a/frontends/dnet-is-application/src/app/common/is.service.ts b/frontends/dnet-is-application/src/app/common/is.service.ts
index b0dc096a..ed6297dc 100644
--- a/frontends/dnet-is-application/src/app/common/is.service.ts
+++ b/frontends/dnet-is-application/src/app/common/is.service.ts
@@ -72,11 +72,12 @@ export class ISService {
 		});
 	}
 
-	addSimpleResource(name: string, type: string, description: string, content: string, onSuccess: Function, relatedForm?: FormGroup): void {
+	addSimpleResource(name: string, type: string, subtype: string, description: string, content: string, onSuccess: Function, relatedForm?: FormGroup): void {
 		const headers = new HttpHeaders().set('Content-Type', 'application/x-www-form-urlencoded')
 		let body = new HttpParams()
 			.set('name', name)
 			.set('type', type)
+			.set('subtype', subtype)
 			.set('description', description)
 			.set('content', content);
 		this.client.post<void>('/ajax/resources/', body, { headers: headers }).subscribe({
diff --git a/frontends/dnet-is-application/src/app/resources/metadata-dialog.html b/frontends/dnet-is-application/src/app/resources/metadata-dialog.html
index 1c391d15..c017f64d 100644
--- a/frontends/dnet-is-application/src/app/resources/metadata-dialog.html
+++ b/frontends/dnet-is-application/src/app/resources/metadata-dialog.html
@@ -13,9 +13,14 @@
 			<input matInput readonly value="{{data.type}}" />
 		</mat-form-field>
 
+		<mat-form-field appearance="fill" floatLabel="always" style="width: 100%;">
+			<mat-label>SubType (optional)</mat-label>
+			<input matInput formControlName="subtype" />
+		</mat-form-field>
+
 		<mat-form-field appearance="fill" floatLabel="always" style="width: 100%;">
 			<mat-label>Name</mat-label>
-			<input matInput formControlName="name" required />
+			<input matInput formControlName="name" />
 			<mat-error *ngIf="metadataForm.get('name')?.invalid">This field is <strong>required</strong></mat-error>
 		</mat-form-field>
 
diff --git a/frontends/dnet-is-application/src/app/resources/new-dialog.html b/frontends/dnet-is-application/src/app/resources/new-dialog.html
index 4ed97939..031a4380 100644
--- a/frontends/dnet-is-application/src/app/resources/new-dialog.html
+++ b/frontends/dnet-is-application/src/app/resources/new-dialog.html
@@ -5,10 +5,15 @@
 
 		<mat-form-field appearance="fill" floatLabel="always" style="width: 100%;">
 			<mat-label>Name</mat-label>
-			<input matInput formControlName="name" required />
+			<input matInput formControlName="name" />
 			<mat-error *ngIf="newResourceForm.get('name')?.invalid">This field is <strong>required</strong></mat-error>
 		</mat-form-field>
 
+		<mat-form-field appearance="fill" floatLabel="always" style="width: 100%;">
+			<mat-label>SubType (optional)</mat-label>
+			<input matInput formControlName="subtype" />
+		</mat-form-field>
+
 		<mat-form-field appearance="fill" floatLabel="always" style="width: 100%;">
 			<mat-label>Description</mat-label>
 			<textarea matInput formControlName="description" rows="2"></textarea>
@@ -16,7 +21,7 @@
 
 		<mat-form-field appearance="fill" floatLabel="always" style="width: 100%;">
 			<mat-label>Content ({{data.contentType}})</mat-label>
-			<textarea matInput formControlName="content" required rows="10" style="font-size: 0.8em;"></textarea>
+			<textarea matInput formControlName="content" rows="10" style="font-size: 0.8em;"></textarea>
 			<mat-error *ngIf="newResourceForm.get('content')?.invalid">This field is <strong>required</strong></mat-error>
 		</mat-form-field>
 
diff --git a/frontends/dnet-is-application/src/app/resources/resources.component.html b/frontends/dnet-is-application/src/app/resources/resources.component.html
index 17ce536b..6463697a 100644
--- a/frontends/dnet-is-application/src/app/resources/resources.component.html
+++ b/frontends/dnet-is-application/src/app/resources/resources.component.html
@@ -12,14 +12,18 @@
 
 <mat-card *ngFor="let r of resources | searchFilter: searchText" style="margin-top: 10px;">
 	<mat-card-header>
-		<mat-card-title title="{{r.id}}">{{r.name}} <span class="badge-label badge-info"
-				style="font-size: 0.7em;">{{type.contentType}}</span></mat-card-title>
+		<mat-card-title title="{{r.id}}">
+			{{r.name}}
+			<span class="badge-label badge-warning" style="font-size: 0.7em;" *ngIf="r.subtype">{{r.subtype}}</span>
+			<span class="badge-label badge-info" style="font-size: 0.7em;">{{type.contentType}}</span>
+		</mat-card-title>
 	</mat-card-header>
 	<mat-card-content>
 		<p>{{r.description}}</p>
 		<p class="muted small">
-			<b>Id:</b> {{r.id}}<br /> <b>Creation date:</b> {{r.creationDate}}<br /> <b>Modification date:</b>
-			{{r.modificationDate}}
+			<b>Id:</b> {{r.id}}<br />
+			<b>Creation date:</b> {{r.creationDate}}<br />
+			<b>Modification date:</b> {{r.modificationDate}}
 		</p>
 	</mat-card-content>
 	<mat-card-actions>
diff --git a/frontends/dnet-is-application/src/app/resources/resources.component.ts b/frontends/dnet-is-application/src/app/resources/resources.component.ts
index c801a65a..1d5c2570 100644
--- a/frontends/dnet-is-application/src/app/resources/resources.component.ts
+++ b/frontends/dnet-is-application/src/app/resources/resources.component.ts
@@ -3,7 +3,7 @@ import { ISService } from '../common/is.service';
 import { ActivatedRoute } from '@angular/router';
 import { MatDialog, MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
 import { ResourceType, SimpleResource } from '../common/is.model';
-import { FormControl, FormGroup } from '@angular/forms';
+import { FormControl, FormGroup, Validators } from '@angular/forms';
 
 @Component({
 	selector: 'app-resources',
@@ -115,12 +115,16 @@ export class ResContentDialog {
 })
 export class ResMetadataDialog {
 	metadataForm = new FormGroup({
-		name: new FormControl(''),
+		name: new FormControl('', [Validators.required]),
+		subtype: new FormControl(''),
 		description: new FormControl('')
 	});
 
 	constructor(public dialogRef: MatDialogRef<ResMetadataDialog>, @Inject(MAT_DIALOG_DATA) public data: any, public service: ISService) {
 		this.metadataForm.get('name')?.setValue(data.name);
+		if (data.subtype) {
+			this.metadataForm.get('subtype')?.setValue(data.subtype);
+		}
 		if (data.description) {
 			this.metadataForm.get('description')?.setValue(data.description);
 		}
@@ -143,9 +147,10 @@ export class ResMetadataDialog {
 })
 export class ResCreateNewDialog {
 	newResourceForm = new FormGroup({
-		name: new FormControl(''),
+		name: new FormControl('', [Validators.required]),
+		subtype: new FormControl(''),
 		description: new FormControl(''),
-		content: new FormControl('')
+		content: new FormControl('', [Validators.required])
 	});
 
 	constructor(public dialogRef: MatDialogRef<ResCreateNewDialog>, @Inject(MAT_DIALOG_DATA) public data: any, public service: ISService) { }
@@ -153,10 +158,11 @@ export class ResCreateNewDialog {
 	onSubmit(): void {
 		let name: string = this.newResourceForm.get('name')?.value!;
 		let type: string = this.data.id!;
+		let subtype: string = this.newResourceForm.get('subtype')?.value!;
 		let description: string = this.newResourceForm.get('description')?.value!;
 		let content: string = this.newResourceForm.get('content')?.value!;
 
-		this.service.addSimpleResource(name, type, description, content, (data: void) => this.dialogRef.close(1), this.newResourceForm);
+		this.service.addSimpleResource(name, type, subtype, description, content, (data: void) => this.dialogRef.close(1), this.newResourceForm);
 	}
 	onNoClick(): void {
 		this.dialogRef.close();
diff --git a/libs/dnet-is-common/src/main/java/eu/dnetlib/is/model/resource/SimpleResource.java b/libs/dnet-is-common/src/main/java/eu/dnetlib/is/model/resource/SimpleResource.java
index b585512f..6a73a64e 100644
--- a/libs/dnet-is-common/src/main/java/eu/dnetlib/is/model/resource/SimpleResource.java
+++ b/libs/dnet-is-common/src/main/java/eu/dnetlib/is/model/resource/SimpleResource.java
@@ -24,6 +24,9 @@ public class SimpleResource implements Serializable {
 	@Column(name = "type")
 	private String type;
 
+	@Column(name = "subtype")
+	private String subtype;
+
 	@Column(name = "description")
 	private String description;
 
@@ -57,6 +60,14 @@ public class SimpleResource implements Serializable {
 		this.type = type;
 	}
 
+	public String getSubtype() {
+		return subtype;
+	}
+
+	public void setSubtype(final String subtype) {
+		this.subtype = subtype;
+	}
+
 	public String getDescription() {
 		return description;
 	}
diff --git a/libs/dnet-is-common/src/main/resources/sql/schema.sql b/libs/dnet-is-common/src/main/resources/sql/schema.sql
index bf24c389..58989441 100644
--- a/libs/dnet-is-common/src/main/resources/sql/schema.sql
+++ b/libs/dnet-is-common/src/main/resources/sql/schema.sql
@@ -139,6 +139,7 @@ CREATE TABLE resources (
 	description       text,
 	content           text NOT NULL DEFAULT '',
 	type              text NOT NULL REFERENCES resource_types(id),
+	subtype           text,
 	creation_date     timestamp NOT NULL DEFAULT now(),
     modification_date timestamp NOT NULL DEFAULT now()
 );
diff --git a/libs/dnet-is-services/src/main/java/eu/dnetlib/is/resource/SimpleResourceService.java b/libs/dnet-is-services/src/main/java/eu/dnetlib/is/resource/SimpleResourceService.java
index 42fbb7cb..993c9fed 100644
--- a/libs/dnet-is-services/src/main/java/eu/dnetlib/is/resource/SimpleResourceService.java
+++ b/libs/dnet-is-services/src/main/java/eu/dnetlib/is/resource/SimpleResourceService.java
@@ -60,6 +60,7 @@ public class SimpleResourceService {
 	@Transactional
 	public SimpleResource saveNewResource(final String name,
 		final String type,
+		final String subtype,
 		final String description,
 		final String content) throws InformationServiceException {
 
@@ -71,6 +72,7 @@ public class SimpleResourceService {
 		res.setId(UUID.randomUUID().toString());
 		res.setName(name);
 		res.setType(type);
+		res.setSubtype(subtype);
 		res.setDescription(description);
 		res.setCreationDate(now);
 		res.setModificationDate(now);