--- title: Displaying related documents related: - https://docs.kentico.com/k8/developing-websites/loading-and-displaying-data-on-websites/writing-transformations.md --- > Agent instructions: > **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown. > > - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version. > - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt). You can add relationships between documents in your website's content tree. Document relationships allow you to: - Display related documents on pages using listing web parts or controls - Work with connections between documents in your custom logic (API) ## Defining document relationship types Before you can connect documents through relationships, you need to set up the relationship types (names) in the system. You can add any number of different relationship types. 1. Open the **Relationship names** application. 2. Click **New relationship name**. 3. Type a **Display name** for the relationship type. 4. Set the **Type** to _Documents_. 5. Click **Save**. 6. Switch to the **Sites** tab and add all sites where you wish to use the relationship. You can now create relationships of the given type between documents. ## Creating relationships between documents To connect two documents through a relationship: 1. Open the **Pages** application. 2. Select one of the documents in the content tree. 3. Switch to the **Properties -> Related docs** tab. 4. Click **Add related document**. 5. Choose the **Relationship name** (type). 6. Select the other related document on the right side of the relationship (type the alias path or click **Select document**). 7. Click **Save**. The two documents are now related. The relationships are not symmetric — each relationship has one of the documents on the left side and the other on the right. You can add any number of relationships to documents. ![Adding relationships between documents](https://docs.kentico.com/docsassets/k8/displaying-related-documents/Document_Relationships.png "Adding relationships between documents") ## Displaying related documents using web parts On [portal engine](https://docs.kentico.com/k8/developing-websites/developing-websites-using-the-portal-engine.md) pages, you can display related documents using listing web parts. Web parts that support relationships have the following properties available in the **Relationships** category: | Document relationship properties (Web parts) | Description | | -------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Main document | Allows you to configure the web part to display only related documents:
**Display documents related to the current document** - documents related to the document that contains the web part.
**Display documents related to the document with NodeGUID** - documents related to the document with the specified Node GUID identifier. You can find the Node GUID of documents on the **Properties -> General** tab of the Pages application. | | Main document is on the left side | Determines whether the specified document (**Main document**) is on the left or right side of the relationship.
If checked, the web part displays documents on the right side of the relationship.
If disabled, the web part displays documents on the left side of the relationship. | | Relationship name | The web part uses the selected document relationship type. | > **Note:** **Note**: The relationship properties do _not_ ensure that web parts load all documents belonging to the specified relationship — they only filter the source data. You still need to set the remaining data source properties to load the required documents (such as the **Path**). ### Example The following example shows how to display news items related to a product using the Repeater web part: 1. Open the **Pages** application and select the sample Corporate site. 2. Select the **/Products/Laptops-and-Tables/Apple iPad2** document and [add a relationship](#creating-relationships-between-documents) (_is related to_) with the **/News/Apple-iPad2-In-Stock** document. 3. Switch to _Apple iPad2_ document's **Design** tab and [add](https://docs.kentico.com/k8/developing-websites/developing-websites-using-the-portal-engine/using-and-configuring-web-parts.md) a **Repeater** web part to _Main zone_. 4. Configure the following properties for the Repeater: - **Path**: /% (displays related news items from the whole website) - **Document types**: CMS.News - **Transformation**: CMS.News.Preview - **Relationships -> Main document**: Display documents related to the current document - **Relationships -> Main document is on the left side**: yes (checked) - **Relationships -> Relationship name**: is related to - **HTML Envelope -> Content before**: \

Related news:\

5. Click **OK**. The page now displays a preview of the news items related to the product. ![Repeater web part displaying a preview of news documents related to a product](https://docs.kentico.com/docsassets/k8/displaying-related-documents/imag.png "Repeater web part displaying a preview of news documents related to a product") ## Displaying documents using controls Use controls to display related documents on [ASPX page templates](https://docs.kentico.com/k8/developing-websites/developing-websites-using-aspx-templates.md) or in the code of custom components. The following controls support displaying of related documents: - [CMSCalendar](https://docs.kentico.com/k8/references/kentico-controls/cms-controls/cms-controls-listings-and-viewers/cmscalendar.md) - [CMSDataGrid](https://docs.kentico.com/k8/references/kentico-controls/cms-controls/cms-controls-listings-and-viewers/cmsdatagrid.md) - [CMSDataList](https://docs.kentico.com/k8/references/kentico-controls/cms-controls/cms-controls-listings-and-viewers/cmsdatalist.md) - [CMSRepeater](https://docs.kentico.com/k8/references/kentico-controls/cms-controls/cms-controls-listings-and-viewers/cmsrepeater.md) - [CMSUniView](https://docs.kentico.com/k8/references/kentico-controls/cms-controls/cms-controls-listings-and-viewers/cmsuniview.md) - [CMSViewer](https://docs.kentico.com/k8/references/kentico-controls/cms-controls/cms-controls-listings-and-viewers/cmsviewer.md) The following properties allow you to filter the documents loaded by the controls according to relationships: | Document relationship properties | Description | Sample value | | -------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------- | | RelationshipWithNodeGUID | If set, the control only loads documents that are related to the document with the specified **NodeGUID**. You can find the Node GUID of documents on the **Properties -> General** tab in the Pages application.
Enter _"11111111-1111-1111-1111-111111111111"_ to dynamically load documents related to the **current** document. | "36f8c4bc-f702-4736-8a25-a82295668794" | | RelatedNodeIsOnTheLeftSide | Determines whether the document specified through the **RelationshipWithNodeGUID** property is on the left or right side of the relationship.
If true, the control displays documents on the right side of the relationship.
If false, the control displays documents on the left side of the relationship. | | | RelationshipName | Specifies the type of the document relationship. Enter the code name of the relationship. | "isrelatedto" | ### Example The following example shows how to display related news documents on pages that use ASPX page templates: 1. Create a new web form in your web project as an [ASPX page template](https://docs.kentico.com/k8/developing-websites/developing-websites-using-aspx-templates/creating-aspx-page-templates.md). - Select the default **CMSTemplates/CorporateSite/root.master** file as the web form's master page. 2. In Visual Studio, drag the **CMSRepeater** control from the toolbox onto the page template's form. 3. Set the following properties for the CMSRepeater control: - **Path**: /% - **ClassNames**: CMS.News - **TransformationName**: cms.news.preview - **RelationshipName**: isrelatedto - **RelationShipWithNodeGUID**: 11111111-1111-1111-1111-111111111111 ```html ``` 4. Save the web form. 5. [Register](https://docs.kentico.com/k8/developing-websites/developing-websites-using-aspx-templates/creating-aspx-page-templates.md#registering-the-web-form-as-a-page-template) the web form as an ASPX page template in the **Page templates** application. 6. Open the **Pages** application and create a page based on the ASPX template. 7. [Add relationships](#creating-relationships-between-documents) (_is related to_) between the new page and news documents on the website. The page displays a preview of the news items related to the document.