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Add <lastmod> tag to every entry in the Sitemap

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TitleAdd <lastmod> tag to every entry in the Sitemap
URL Nameadd-lastmod-tag-to-every-entry-in-the-sitemap
Article Number000111387
EnvironmentProduct: Sitefinity
Version: 5.x, 6.x, 7.x, 8.x, 9.x, 10.x, 11.x, 12.x
OS: All supported OS versions
Database: All supported Microsoft SQL Server versions
Question/Problem Description
How to add a <lastmod> tag to every entry in the Sitemap so that the last modified date of the items is included?
How to include the lastmod attribute included in the generated Sitemap?
How to manage site content with the corresponding LastModified date for the corresponding page (content item)

When a new SitemapEntry for every content item is added the LastModified property of the SitemapEntry object doesn’t work using the Before_Writing(ISitemapGeneratorBeforeWriting) event
The LastModified property of the SitemapEntry object does not work when the "ISitemapGeneratorBeforeWriting event" is used
The LastModified property of sitemap entries in the Before_Writing() event does not add a <lastmod> tag to the sitemap for managing site content
Steps to Reproduce
Clarifying Information
Error Message
Defect/Enhancement Number
Cause
Resolution
In the current product, the class (and methods) used to generate the XML structure of the sitemap is not extendable. The methods that generate the sitemap XML nodes are private methods, and the entire StandardSitemapGenerator, ISitemapGenerator class is not used in such a way that the entire class can be replaced. It is not exposed and therefore not used through the DI container.

To date, two requests for this feature have been submitted as an Idea on the Progress Sitefinity Community. Weigh-in with your suggestions and promote the Idea to assist with prioritisation during review by selecting the following links:
          
Add <lastmod> tag to Sitefinity sitemap
https://sitefinity.ideas.aha.io/ideas/SF-I-1984   

Ability to add columns PublicationDate, LastModified and LastModifiedBy for pages backend list view
https://sitefinity.ideas.aha.io/ideas/SF-I-1235  

Customer feedback is valuable and feature requests are monitored by our Product Management team. Feature requests are reviewed during the planning phase of each new product release and a list of the enhancements chosen for implementation can be found in the Release Notes documents that accompany each release.
Workaround
Notes
Last Modified Date7/10/2020 2:53 PM
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