ChangeLog.text

FeedWordPress Change Log
========================

Changes from 0.99 to 0.991
--------------------------
*	WORDPRESS MU COMPATABILITY: FeedWordPress should now be compatible with
	recent releases of WordPress MU. Once FeedWordPress is made available
	as a plugin, each individual blog can choose to activate FeedWordPress
	and syndicate content from its own set of contributors.

*	DISPLAY OF MAGPIE WARNINGS: A number of MagpieRSS warnings or error
	messages that were displayed when performing an automatic update are
	no longer displayed, unless debugging parameters have been explicitly
	enabled.

*	media:content BUG IN MAGPIERSS FIXED: A bug in MagpieRSS's handling of
	namespaced elements has been fixed. Among other things, this bug caused
	items containing a Yahoo MediaRSS `<media:content>` element (such as
	many of the feeds produced by wordpress.com) to be represented
	incorrectly, with only a capital "A" where the content of the post
	should have been. Feeds containing `<media:content>` elements should now
	be syndicated correctly.

*	update_feedwordpress PARAMETER: You can now use an HTTP GET parameter
	(`update_feedwordpress=1`) to request that FeedWordPress poll its feeds
	for updates. When used together with a crontab or other means of
	scheduling tasks, this means that you can keep your blog automatically
	updated on a regular schedule, even if you do not choose to use the
	cron-less automatic updates option.

*	Some minor interface-related bugs were also fixed.


Changes from 0.981 to 0.99
--------------------------
Version 0.99 adds several significant new features, fixes some bugs, and
provides compatability with WordPress 2.2.x and 2.3.x.

*	WORDPRESS 2.2 AND 2.3 COMPATIBILITY: FeedWordPress should now be
	compatible with WordPress version 2.2 and the upcoming WordPress
	version 2.3. In particular, it has been tested extensively against
	WordPress 2.2.3 and WordPress 2.3 Release Candidate 1.

*	AUTOMATIC UPDATES WITHOUT CRON: FeedWordPress now allows you to
	automatically schedule checks for new posts without using external task
	scheduling tools such as cron. In order to enable automatic updates, go
	to **Syndication --> Options** and set "Check for new posts" to
	"automatically." For details, see "Automatic Feed Updates" in
	README.text.

	An important side-effect of the changes to the update system is that if
	you were previously using the cron job and the `update-feeds.php` script
	to schedule updates, you need to change your cron set-up. The old
	`update-feeds.php` script no longer exists. Instead, if you wish to use
	a cron job to guarantee updates on a particular schedule, you should
	have the cron job fetch the front page of your blog (for example, by
	using `curl http://www.zyx.com/blog/ > /dev/null`) instead of activating
	the `update-feeds.php` script. If automatic updates have been enabled,
	fetching the front page will automatically trigger the update process.

*	INTERFACE REORGANIZATION: All FeedWordPress functions are now located
	under a top-level "Syndication" menu in the WordPress Dashboard. To
	manage the list of syndicated sites, manually check for new posts on
	one or more feeds, or syndicate a new site, you should use the main page
	under **Syndication**. To change global settings for FeedWordPress,
	you should use **Syndication --> Options**.

*	FILE STRUCTURE REORGANIZATION: Due to a combination of changing styles
	for FeedWordPress plugins and lingering bugs in the FeedWordPress admin
	menu code, the code for FeedWordPress is now contained in two different
	PHP files, which should be installed together in a subdirectory of your
	plugins directory named `feedwordpress`. (See README.text for
	installation and upgrade instructions relating to the change.)

*	MULTIPLE CATEGORIES SETTING: Some feeds use non-standard methods to
	indicate multiple categories within a single category element. (The most
	popular site to do this is del.icio.us, which separates tags with a
	space.) FeedWordPress now allows you to set an optional setting, for any
	feed which does this, indicating the character or characters used to
	divide multiple	categories, using a Perl-compatible regular expression.
	(In the case of del.icio.us feeds, FeedWordPress will automatically use
	\s for the pattern without your having to do any further configuration.)
	To turn this setting on, simply use the "Edit" link for the feed that
	you want to turn it on for.

*	REGULAR EXPRESSION BUG FIXED: Eliminated a minor bug in the regular
	expressions for e-mail addresses (used in parsing RSS `author`
	elements), which could produce unsightly error messages for some users
	parsing RSS 2.0 feeds.

*	DATE / UPDATE BUG FIXED: A bug in date handling was eliminated that may
	have caused problems if any of (1) WordPress, or (2) PHP, or (3) your
	web server, or (4) your MySQL server, has been set to use a different
	time zone from the one that any of the others is set to use. If
	FeedWordPress has not been properly updating updated posts, or has been
	updating posts when there shouldn't be any changes for the update, this
	release may solve that problem.

*	GOOGLE READER BUGS FIXED: A couple of bugs that made it difficult for
	FeedWordPress to interact with Google Reader public feeds have been
	fixed. Firstly, if you encountered an error message reading "There was a
	problem adding the newsfeed. [SQL: ]" when you tried to add the feed,
	the cause of this error has been fixed. Secondly, if you succeeded in
	getting FeedWordPress to check a Google Reader feed, only to find that
	the title of posts had junk squashed on to the end of them, that bug
	has been fixed too. To fix this bug, you must install the newest version
	of the optional MagpieRSS upgrade.

*	FILTER PARAMETERS: Due to an old, old bug in WordPress 1.5.0 (which was
	what was available back when I first wrote the filter interface),
	FeedWordPress has traditionally only passed one parameter to
	syndicated_item and syndicated_post filters functions -- an array
	containing either the Magpie representation of a syndicated item from
	the feed, or the database representation of a post about to be inserted
	into the WordPress database. If you needed information about the feed
	that the item came from, this was accessible only through a pair of
	global variables, $fwp_channel and $fwp_feedmeta.

	Since it's been a pretty long time since WordPress 1.5.0 was in
	widespread usage, I have gone ahead and added an optional second
	parameter to the invocation of the syndicated_item and syndicated_post
	filters. If you have written a filter for FeedWordPress that uses either
	of these hooks, you can now register that filter to accept 2 parameters.
	If you do so, the second parameter will be a SyndicatedPost object,
	which, among other things, allows you to access information about the
	feed from which an item is syndicated using the $post->feed and the
	$post->feedmeta elements (where $post is the name of the second
	parameter).
	
	NOTE THAT THE OLD GLOBAL VARIABLES ARE STILL AVAILABLE, for the time
	being at least, so existing filters will not break with the upgrade.
	They should be considered deprecated, however, and may be eliminated in
	the future.

*	FILTER CHANGE / BUGFIX: the array that is passed as the first argument
	syndicated_post filters no longer is no longer backslash-escaped for
	MySQL when filters are called. This was originally a bug, or an
	oversight; the contents of the array should only be escaped for the
	database *after* they have gone through all filters. IF YOU HAVE WRITTEN
	ANY syndicated_post FILTERS THAT PRESUME THE OLD BEHAVIOR OF PASSING IN
	STRINGS THAT ARE ALREADY BACKSLASH-ESCAPED, UPDATE YOUR FILTERS
	ACCORDINGLY.

*	OTHER MINOR BUGFIXES AND INTERNAL CHANGES: The internal architecture of
	FeedWordPress has been significantly changed to make the code more
	modular and clean; hopefully this should help reduce the number of
	compatibility updates that are needed, and make them easier and quicker
	when they are needed.

Changes from 0.98 to 0.981
--------------------------
Version 0.981 is a narrowly targeted bugfix and compatibility release, whose
main purpose is to resolve a major outstanding problem: the incompatibility
between version 0.98 of WordPress and the recently released WordPress 2.1.

*	WORDPRESS 2.1 COMPATIBILITY: FeedWordPress is now compatible with
	WordPress 2.1, as well as retaining its existing support for WordPress
	2.0 and 1.5. Incompatibilities that resulted in database warnings, fatal
	errors, and which prevented FeedWordPress from syndicating new posts,
	have been eliminated.

*	RSS-FUNCTIONS.PHP RENAMED TO RSS.PHP: if you use the upgraded MagpieRSS
	replacement that's included with FeedWordPress, be sure to note that
	there are now *two* files to upload from the `OPTIONAL/wp-includes`
	subdirectory in order to carry out the upgrade: rss-functions.php and
	rss.php. **It is necessary to upload both files**, due to a change in
	the file naming scheme in WordPress 2.1, and it is necessary to do so
	whether you are using WordPress 2.1 or not. If you only upload the
	`rss-functions.php` file as in previous installations you will not have
	a working copy of MagpieRSS; the rss.php file contains the actual code.

*	DATE BUG AFFECTING SOME PHP INSTALLATIONS RESOLVED: due to a subtle bug
	in parse_w3cdtf(), some installations of PHP encountered problems with
	FeedWordPress's attempt to date posts, which would cause some new posts
	on Atom feeds to be dated as if they had apppeared in 1969 or 1970
	(thus, effectively, never appearing on front apge at all). This bug in
	the date handling should now be fixed.

*	PHP <?=...?> SHORT FORM ELIMINATED: some installations of PHP do not
	allow the <?=...?> short form for printing PHP values, which was used
	extensively in the FeedWordPress interface code. Since this could cause
	fatal errors for users with the wrong installation of PHP, the short
	form has been replaced with full PHP echo statements, and is no longer
	used in FeedWordPress.

*	BETTER USER INTERFACE INTEGRATION WITH WORDPRESS 2.x: Some minor changes
	have been made to help the FeedWordPress interface pages blend in better
	with the user interface when running under WordPress 2.x.

* 	GLOBAL CATEGORIES BUG RESOLVED: a bug that prevented some users from
	setting one or more categories to apply to syndicated posts from all
	feeds (using the checkbox interface under Options --> Syndication) has
	been resolved.

Changes from 0.97 to 0.98
--------------------------

*	WORDPRESS 2.0 COMPATIBILITY: This is a narrowly-targeted release to
	solve a major outstanding problem. FeedWordPress is now compatible with
	both WordPress 1.5 and WordPress 2.0. Incompatibilities that caused
	fatal SQL errors, and a more subtle bug with off-kilter counts of posts
	under a given category, have been resolved. FeedWordPress tests for
	database schema using the global $wp_db_version variable (if null, then
	we presume that we're dealing with WordPress 1.5).

	NOTE: I have **not** fully tested FeedWordPress with WordPress 2.0.
	Further testing may reveal more bugs. However, you should now be able
	to get at least basic FeedWordPress functionality up and running.

*	AUTHOR MATCHING: FeedWordPress tests several fields to see if it can
	identify the author of the post as a user already in the WordPress user
	database. In previous versions, it tested the user login, the nickname,
	and tested for "aliases" listed in the Profile (see documentation). FWP
	now also matches authors on the basis of e-mail address (*if* an e-mail
	address is present). This is particularly helpful for formats such as
	RSS 2.0, in which authors are primarily identified by e-mail addresses.

Changes from 0.96 to 0.97
-------------------------

*	INSTALLATION PROCEDURE: Some of the changes between 0.96 and 0.97
	require upgrades to the meta-data stored by FeedWordPress to work
	properly. Thus, if you are upgrading from 0.96 or earlier to 0.97, most
	FeedWordPress operations (including updates and template functions)
	WILL BE DISABLED until you run the upgrade procedure. Fortunately,
	running the upgrade procedure is easy: just go to either Options -->
	Syndication or Links --> Syndicated in the WordPress Dashboard and press
	the button.

*	FEED FORMAT SUPPORT: Support has been added for the Atom 1.0 IETF
	standard. Several other elements are also newly supported
	(dcterms:created, dcterms:issued, dcterms:modified, dc:identifier,
	proper support for the RSS 2.0 guid element, the RSS 2.0 author element,
	the use of Atom author or Dublin Core dc:creator constructs at the feed
	level to identify the author of individual items, etc.)

	N.B.: full support of several Atom 1.0 features, such as categories
	and enclosures, requires you to install the optional rss-functions.php
	upgrade in your wp-includes directory.

*	BUG FIX: Running `update-feeds.php` from command line or crontab
	returned "I don't syndicate..." errors. It turns out that WordPress
	sometimes tramples on the internal PHP superglobals that I depended on
	to determine whether or not the script was being invoked from the
	command line. This has been fixed (the variables are now checked
	*before* WordPress can trample them). Note that `update-feeds.php` has
	been thoroughly overhauled anyway; see below for details.

*	BUG FIX: Duplicate categories or author names. Fixed two bugs that could
	create duplicate author and/or category names when the name contained
	either (a) certain international characters (causing a mismatch between
	MySQL and PHP's handling of lowercasing text), or (b) characters that
	have a special meaning in regular expressions (causing MySQL errors when
	looking for the author or category due to regexp syntax errors). These
	should now be fixed thanks to careful escaping of names that go into
	regular expressions and careful matching of lowercasing functions
	(comparing results from PHP only to other results from PHP, and results
	from MySQL only to other results from MySQL).

*	BUG FIX: Items dated Decembr 31, 1969 should appear less often. The
	function for parsing W3C date-time format dates that ships with
	MagpieRSS can only correctly parse fully-specified dates with a
	fully-specified time, but valid W3C date-time format dates may omit the
	time, the day of the month, or even the month. Some feeds in the wild
	date their items with coarse-grained dates, so the optional
	`rss-functions.php` upgrade now	includes a more flexible parse_w3cdtf()
	function that will work with both coarse-grained and fully-specified
	dates. (If parts of the date or the time are omitted, they are filled in
	with values based on the current time, so '2005-09-10' will be dated to
	the current time on that day; '2004' will be dated to this day and time
	one year ago.

	N.B.: This fix is only available in the optional `rss-functions.php`
	upgrade.

*	BUG FIX: Evil use of HTTP GET has been undone. The WordPress interface
	is riddled with	inappropriate (non-idempotent) uses of HTTP GET queries
	(ordinary links	that make the server do something with significant
	side-effects, such as deleting a post or a link from the database).
	FeedWordPress did some of this too, especially in places where it aped
	the WordPress interface	(e.g. the "Delete" links in Links -->
	Syndicated). That's bad business, though. I've changed the interface so
	that all the examples of improper side-effects that I can find now
	require an HTTP POST to take effect. I think I got pretty much
	everything; if there's anything that I missed, let me know.

	Further reading: [Sam Ruby 2005-05-06: This Stuff Matters]	(http://www.intertwingly.net/blog/2005/05/06/This-Stuff-Matters)

*	BUG FIX: Categories applied by `cats` setting should no longer prevent
	category-based filtering from working. In FeedWordPress, you can (1)
	apply certain categories to all syndicated posts, or all posts from
	a particular feed; and (2) filter out all posts that don't match one
	of the categories that are already in the WordPress database (allowing
	for simple category-based filtering; just load up WordPress with the
	categories you want to accept, and then tell FeedWordPress not to create
	new ones). However, the way that (1) and (2) were implemented meant that
	you couldn't effectively use them together; once you applied a known
	category to all syndicated posts from a particular feed, it meant that
	they'd have at least one familiar category (the category or categories
	you were applying), and that would get all posts past the filter no
	matter what categories they were originally from.
	
	Well, no longer. You can still apply categories to all syndicated posts
	(using either Syndication --> Options, or the feed-level settings under
	Links --> Syndicated). But these categories are not applied to the post
	until *after* it has already passed by the "familiar categories" filter.
	So now, if you want, you can do category filtering and *then* apply as
	many categories as you please to all and only posts that pass the filter.

*	BUG FIX: Other minor typos and HTML gaffes were fixed along the way.

*	PERFORMANCE: get_feed_meta() no longer hits the database for information
	on every call; it now caches link data in memory, so FeedWordPress only
	goes to the database once for each syndicated link. This may
	substantially improve performance if your database server resources
	are tight and your templates make a lot of use of custom settings from
	get_feed_meta().

*	API CHANGE: Link ID numbers, rather than RSS URIs, are now used to
	identify the feed from which a post is syndicated when you use template
	functions such as get_feed_meta(). The practical upshot of this is you
	can switch feeds, or change the feed address for a particular syndicated
	site, without breaking your templates for all the posts that were
	syndicated from the earlier URI.

*	API CHANGE: if you have plugins or templates that make use of the
	get_feed_meta() function or the $fwp_feedmeta global, note that the
	data formerly located under the `uri` and `name` fields is now located
	under the `link/uri` field and the `link/name` field, respectively. Note
	also that you can access the link ID number for any given feed under the
	global $fwp_feedmeta['link/id'] (in plugins) or 
	get_feed_meta('link/id') (in a template in post contexts).
	
*	FEATURE: the settings for individual feeds can now be edited using a
        humane interface (where formerly you had to tweak key-value pairs in the
	Link Notes section). To edit settings for a feed, pick the feed that you
	want under Links --> Syndicated and click the Edit link.

*	FEATURE: The "Unsubscribe" button (formerly "Delete") in Links -->
	Syndicated now offers three options for unsubscribing from a feed: (1)
	turning off the subscription without deleting the feed data or affecting
	posts that were syndicated from the feed (this works by setting the Link
	for the feed as "invisible"); (2) deleting the feed data and all of the
	posts that were syndicated from the feed; or (3) deleting the feed data
	and *keeping* the posts that were syndicated from the feed
	setting the Link to "Invisible" (meaning that it will not be displayed
	in lists of the site links on the front page, and it won't be checked
	for updates; (2) deleting the Link and all of the posts that were
	syndicated from its feed; or (3) deleting the feed data but keeping the
	posts that were syndicated (which will henceforward be treated as if
	they were local rather than syndicated posts). (Note that (1) is usually
	the best option for aggregator sites, unless you want to clean up the
	results of an error or a test.)

*	FEATURE / BUG FIX: If you have been receiving mysterious "I don't
	syndicate...", or "(local) HTTP status code was not 200", or "(local)
	transport error - could not open socket", or "parse error - not well
	formed" errors, then this update may solve your problems, and if it does
	*not* solve them, it will at least make the reasons for the problems
	easier to understand. That's because I've overhauled the way that
	FeedWordPress goes about updating feeds.

	If you use the command-line PHP scripting method to run scheduled
	updates, then not much should change for you, except for fewer
	mysterious errors. If you have done updates by sending periodic HTTP
	requests to <http://your-blog.com/path/wp-content/update-feeds.php>,
	then the details have changed somewhat; mostly in such a way as to make
	things easier on you. See the README file or online documentation on
	Staying Current for the details.

*	FEATURE: FeedWordPress now features a more sophisticated system for
	timed updates. Instead of polling *every* subscribed feed for updates
	*each* time `update-feeds.php` is run, FeedWordPress now keeps track of
	the last time it polled each feed, and only polls them again after a
	certain period of time has passed. The amount of time is normally set
	randomly for each feed, in a period between 30 minutes and 2 hours (so
	as to stagger updates over time rather than polling all of the feeds at once. However, the length of time between updates can also be set
	directly by the feed, which brings us to ...
	
*	FEATURE: FeedWordPress now respects the settings in the `ttl` and
	Syndication Module RSS elements. Feeds with these elements set will not
	be polled any more frequently than they indicate with these feeds unless
	the user manually forces FeedWordPress to poll the feed (see Links -->
	Syndicated --> Edit settings).

Changes from 0.95 to 0.96
-------------------------

*	FEATURE: support has been added for enclosures in RSS 2.0 and Atom
	0.6+ newsfeeds. WordPress already supports adding enclosures to an
	item; FeedWordPress merely gets the information on the enclosure
	from the feed it is syndicating and plugs that information directly
	into the WordPress database so that (among other things) that post
	will have its enclosure listed in your blog's RSS 2 newsfeed.

	Note that enclosure support requires using the optional MagpieRSS
	upgrade (i.e., replacing your `wp-includes/rss-functions.php` with `OPTIONAL/wp-includes/rss-functions.php` from the FWP archive)

*	FEATURE: for completeness's sake, there is now a feed setting,
	`hardcode url`, that allows you to set the URI for the front page
	of a contributor's website manually (that is, prevent it from being
	automatically updated from the feed channel link on each update). To
	set the URI manually, put a line like this in the Link Notes section
	of a feed:
	
		hardcode url: yes
	
	You can also instruct FeedWordPress to use hardcoded URIs by default
	on all feeds using Options --> Syndication

*	FEATURE: by default, when FeedWordPress finds new syndicated posts,
	it (1) publishes them immediately, (2) turns comments off, and (3)
	turns trackback / pingback pings off. You can now alter all three
	default behaviors (e.g., to allow pings on syndicated posts, or to
	send newly-syndicated posts to the draft pile for moderation) using
	Options --> Syndication


Changes from 0.91 to 0.95
-------------------------

*	BUG FIX: Fixed an obscure bug in the handling of categories:
	categories with trailing whitespace could cause categories with
	duplicate names to be created. This no longer happens. While I was
	at it I tightened up the operation of
	FeedWordPress::lookup_categories() a bit in general.

*	FEATURE DEPRECATED: the feed setting `hardcode categories` is now
	deprecated in favor of `unknown categories` (see below), which
	allows you to strip off any syndication categories not already in
	your database using `unknown categories: default` or `unknown
	categories: filter`. If you have `hardcode categories: yes` set on a
	feed, this will be treated as `unknown categories: default` (i.e.,
	no new categories will be added, but if a post doesn't match any of
	the categories it will be added in the default category--usually
	"Uncategorized" or "General").

*	FEATURE: You can now set global defaults as to whether or not
	FeedWordPress will update the Link Name and Link Description
	settings for feeds automatically from the feed title and feed
	tagline. (By default, it does, as it has in past versions.) Whether
	this behavior is turned on or off, you can still override the
	default behavior using feed settings of `hardcode name: yes`,
	`hardcode name: no`, `hardcode description: yes`, or `hardcode
	description: no`.

*	FEATURE: Users can now provide one or several "aliases" for an
	author, just as they can for a category. For example, to make
	FeedWordPress treat posts by "Joseph Cardinal Ratzinger" and "Pope
	Benedict XVI" as by the same author, edit the user profile for Pope
	Benedict XVI and add a line like this to the "User profile" field:
	
		a.k.a.: Joseph Cardinal Ratzinger
	
	You can add several aliases, each on a line by itself. You can also
	add any other text you like to the Profile without interfering with
	the aliases.
	
*	FEATURE: Users can now choose how to handle syndicated posts that
	are in unfamiliar categories or by unfamiliar authors (i.e.,
	categories or authors whose names are not yet in the WordPress
	database). By default, FeedWordPress will (as before) create a new
	category (or new author) and use it for the current post and any
	future posts. This behavior can be changed, either for all feeds or
	for one or another particular feed.
	
	There are now three different options for an unfamiliar author: (1)
	FeedWordPress can create a new author account and attribute the
	syndicated post to the new account; (2) FeedWordPress can attribute
	the post to an author if the author's name is familiar, and to a
	default author (currently, this means the Site Administrator
	account) if it is not; (3) FeedWordPress can drop posts by
	unfamiliar authors and syndicate only posts by authors who are
	already in the database.
	
	There are, similarly, two different options for an unfamiliar
	category: (1) FeedWordPress can create new categories and place the
	syndicated post in them; (2) FeedWordPress can drop the unfamiliar
	categories and place syndicated posts only in categories that it is
	already familiar with. In addition, FeedWordPress 0.95 lets you
	choose whether posts that are in *no* familiar categories should be
	syndicated (and placed in the default category for the blog) or
	simply dropped.
	
	You can set the default behavior for both authors and categories
	using the settings in Options --> Syndication. You can also set
	different behavior for specific feeds by adding the `unfamiliar
	author` and / or `unfamiliar categories` settings to the Link Notes
	section of a feed:
	
		unfamiliar author: (create|default|filter)
		unfamiliar categories: (create|default|filter)
	
	A setting of `unfamiliar author: create` will make FeedWordPress
	create new authors to match unfamiliar author names *for this feed
	alone*. A setting of `unfamiliar author: default` will make it
	assign posts from unfamiliar authors to the default user account. A
	setting of `unfamiliar author: filter` will cause all posts (from
	this feed alone) to be dropped unless they are by an author already
	listed in the database. Similiarly, `unfamiliar categories: create`
	will make FeedWordPress create new categories to match unfamiliar
	category names *for this feed alone*; `unfamiliar categories:
	default` will cause it to drop any unfamiliar category names; and
	`unfamiliar categories: filter` will cause it to *both* drop any
	unfamiliar category names *and* to only syndicate posts that are
	placed in one or more familiar categories.
	
	These two new features allow users to do some coarse-grained
	filtering without having to write a PHP filter. Specifically, they
	offer an easy way for you to filter feeds by category or by author.
	Suppose, for example, that you only wanted to syndicate posts that
	your contributors place in the "Llamas" category. You could do so by
	setting up your installation of WordPress so that the only category
	in the database is "Llamas," and then use Options --> Syndication to
	set "Unfamiliar categories" to "don't create new categories and
	don't syndicate posts unless they match at least one familiar
	category". Now, when you update, only posts in the "Llamas" category
	will be syndicated by FeedWordPress.
	
	Similarly, if you wanted to filter one particular feed so that only
	posts by (for example) the author "Earl J. Llama" were syndicated to
	your site, you could do so by creating a user account for Earl J.
	Llama, then adding the following line to the settings for the feed
	in Link Notes:
	
		unfamiliar author: filter
	
	This will cause any posts from this feed that are not authored by
	Earl J. Llama to be discarded, and only the posts by Earl J. Llama
	will be syndicated. (If the setting is used on one specific feed, it
	will not affect how posts from other feeds are syndicated.)