Add lastmod, last modified date of the bibliographic entry #302
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lastmod is used in the sitemap to help identify files that have changed and should be recrawled. Writing lastmod into the markdown file's YAML will ensure it takes presidence over the current date field, which represents the publication date of the item, not the last time the bibliographic entry was modified.
pamoroso
approved these changes
Nov 3, 2025
MattHeffron
reviewed
Nov 4, 2025
| url_source: $urlSource | ||
| zotero_url: "https://www.zotero.org/groups/2914042/items/$key" | ||
| # Timestamp of last modification to bibliographic item |
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Is the perl comment skipped in hugo as well.
I'm pretty sure that perl doesn't skip comments in the "here doc" string.
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Yes - the comment flows into the markdown file and when Hugo processes it, it is ignored.
Here's what the yml header looks like in a file:
---
title: |
Lisp Editing in the 80s - Interlisp SEdit
date: 2017-06-22
readabledate: 2017-06-22
type: bibliography
item_type: motion_picture
authors:
editors:
abstract: |
Reuploaded from:
http://people.csail.mit.edu/riastradh...
Thanks to "lispm" on reddit for all the info:
https://www.reddit.com/r/lisp/comment...
From what I understand SEdit was developed later than DEdit. SEdit is documented first in the 1987 Lyric release of Interlisp-D, see Appendix B:
http://bitsavers.trailing-edge.com/pd...
SEdit is expanded in the virtual machine version of Interlisp-D, called Medley. See the Medley 1.0 release notes, appendix B:
http://bitsavers.trailing-edge.com/pd...
Some hints for using SEdit
http://bitsavers.trailing-edge.com/pd...
If you want to try it out, maybe this contains the editors:
http://www2.parc.com/isl/groups/nltt/...
studio: "thoughtupquick"
video_recording_format: ""
series_title: ""
volume: ""
number_of_volumes: ""
tags:
url_source: https://www.youtube.com/watch?v=2qsmF8HHskg
zotero_url: "https://www.zotero.org/groups/2914042/items/4CCTNX5G"
# Timestamp of last modification to bibliographic item
lastmod: 2025-10-24T22:43:20Z
---
I wanted to make sure it the meaning of the lastmod was clear. Putting it at the bottom and separating it from the dates related to the entry itself, should make it clear this isn't directly related to when the item was initially published.
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lastmodis used insitemap.xmlto help identify files that have changed and should be recrawled. Writinglastmodinto the markdown file's YAML will ensure it takes precedence over the current date field, which represents the publication date of the item, not the last time the bibliographic entry was modified.Resolves issue 2346