Category Archives: WordPress

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WordPress Plugin: Semantic Visits

FOAF Explorer, Release, Travelling, Vocabularies, WordPress

When I came back from Madrid, after the Image Decription workshop, a few days in the city, and a hefty party in Getafe, I realised I could add another country to my list of visits.

The nice folks at World66 have created a nice interface for generating an image with visited countries highlighted, but while it would be easy to check a few boxes and copy the code to somewhere on my blog pages, that wouldn’t make it possible for the semantic web to figure out where I’ve been. For that reason, I decided to mint a set of vocabulary terms for visits according to Norm Walsh’s country counting rules, collected in the visit vocabulary, and have WordPress output the information in my FOAF profile – thanks to the extensibility of my FOAF Output Plugin. Of course, the FOAF Explorer now also understands these terms, displaying maps of the world, Canada and USA when appropriate — see for yourself!

Thus, here is a new plugin, the Semantic Visits Plugin (view source).

The current version is 1.1.

Changes since 1.0:
  • Added visits to Canadian regions.
  • Fixed “wrong” code/name/etc. properties.
  • The URIs for US states are now correct, pointing at the http://www.daml.ri.cmu.edu/ont/USRegionState.daml ontology containing state definitions instead of http://www.daml.ri.cmu.edu/ont/State.daml which only contains classes and properties.

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WordPress Plugin: FOAF Output

FOAF, Release, RSS, WordPress

A while ago I hacked WordPres into emitting FOAF, but even though it worked fine, the amount of WordPress-tweaking wasn’t for the faint of heart.

Since then, I have looked a little deeper into WordPress, and now it’s finally ready: The FOAF Output Plugin (view source).

Note: If you want to try running this with WordPress > 1.2, please fix the .htaccess rewrite rule for the author pages like this, otherwise the FOAF file will result in a 404:

RewriteRule ^author/([^/].+)/?$ /<SITEHOME>/index.php?author_name=$1 [QSA,L]

The current version is 1.17 (released 2005-08-31).

Changes since 1.16:
  • Fixed errant line breaks in links.
  • Added generator comment to RSS output.
Changes since 1.15:
  • Added oneline bio on profile page, not HTML-escaped.
  • Added link to RSS channel from author list.
  • Tweaked prefix usage for namespaces.
Changes since 1.14:
  • Added check for array being returned from get_the_category().
  • Added check for get_Lat and get_Long for > 1.2 compatibility.
Changes since 1.13:
  • Fixed category/interest when no categories were found.
  • Changed skos:externalID to dc:identifier.
  • Updated SKOS generation with SKOS extensions vocabulary.
  • Fixed generation of author list URI.
Changes since 1.12:
  • Changed a wrong foaf:made to foaf:page, caught by Ian Davis.
  • Fixed erroneous output of homepage URI on profile page.
  • Fixed a problem with statements being added to Atom feeds, thanks Danny/Sam.
Changes since 1.11:
  • Added blog-wide FOAF output (blogroll) with seeAlso’s to authors’ individual files (example).
Changes since 1.10:
  • Added SKOS output (example) and enhanced RSS output.
  • Added document level RDF/XML API hook, foaf_output_profile_rdf_document, to allow for additional properties by add-ons, e.g. generator information.
  • Fixed possible missing namespace declarations for dcterms in RSS/Atom.
  • Tweaked initialisation code to increase reusability.
Changes since 1.9:
  • Fixed limited interest generation for HTML profile page.
  • Multiple URIs per interest is now handled correctly (if separated by whitespace).
  • Only categories with posts by author are deemed “interesting”.
  • Added bio:olb per B.K. DeLong’s suggestion.
  • Added trust ratings for friends.
Changes since 1.8:
  • Renamed foaf_output_the_date to get_foaf_output_profile_page to better reflect the functionality.
Changes since 1.7:
  • Improved identification of “active” author / user.
  • Now really only shows profile on first archive page, even in paged mode.

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Semantic Comments Feeds from WordPress

FOAF, RSS, WordPress

As hinted to last week, I now have my WordPress installation output comments as RSS 1.0, both as a blog-wide feed and as a feed per post.

At the core they are just like other feeds, but comments are a little more diverse than posts. There are regular comments, entered in the comment form for each post, and PingBack‘s and TrackBack‘s, both of which are “remote” — a notification of reference from somewhere else.

Each of these three types of comments are different from each other, and need to be handled differently.

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WordPress Plugin: Linkifier

WordPress

To scratch an itch, I’ve hacked a simple plugin, that makes it easier to link to friends and category topics.

When enclosing the name of a friend, a friend’s blog name, or a category name, in {}, the plugin takes care of turning it into a link, including XFN link relations for friends. If a category or link isn’t found for a particular name, a warning will be shown above the post preview in the administration interface, but the text will be left alone.

Now, whenever I link to Danny Ayers, all I have to do is write his name within curly brackets: {Danny Ayers}. Same goes for my {RSS} category: RSS.

Of course, it’s not quite as simple as that, a few prerequisites need to be in order. Luckily, they coincide with the requirements of my FOAF output hack:

  • Categories must have only a URI in their description.
  • Link URIs must be to the weblog of the person.
  • Link name must be the name of the weblog.
  • Link description must be the name of the person.

Download the plugin: Linkifier (rename to linkifier.php and place it in the /wp-content/plugins/ directory)
View source: Linkifier Source

FOAF output from WordPress

FOAF, WordPress

Note: Please see FOAF Output Plugin for newer versions of WordPress.

A few days ago, Christopher Schmidt mentioned in a comment that he had been hacking on FOAF export for WordPress. He kindly let me take a look at his work, and in addition posted a message to rdfweb-dev.

In short, he had created a set of dynamic stand-alone profile pages, one with HTML output and one with RDF/XML output using FOAF, in a single file, /profile2.php.

Seeing that, it dawned on me: WordPress already has a “profile” page for each of the authors, likely at /archives/author/<login>/ (depending on the permalink structure defined) — and it even has a template name: the_author_posts_link. In its default incarnation it’s simply a list of the posts by that author, but turning it into a profile page by also showing the basic information and linked friends didn’t seem too hard.

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