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The Python Desktop Server now supports topic definition in weblogs. Two kinds of topic clouds are used:
This enables others to gather categorization information from postings by parsing the relevant stuff out of RSS feeds. One note with topicexchange topics: the system only stores topics for which the posting was pinged at the time of writing. So if you later add a local category to a posting that had a topic connected, and you don't reping the topic, you will have the weird situation that only those RSS feeds reference the topic where the category was set with the first ping. The new category will push the post to a new RSS feed, but won't include the topic! This is due to some internal problems with the Python Desktop Server (pings are stored with the GUID as reference, and the GUID is category-related - any post can have multiple GUIDs, one for each category, one for the homepage and one internal that can't be used as permalink).
Maybe some day I will solve this, but it's only a minor annoyance in very special situations - and you can get around it by just repinging the topic when changing categories.
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