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= rel-tag frequently asked questions =  
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This document serves to answer and discuss frequently asked questions specifically about the [[rel-tag]] microformat. You may want to read the [[rel-faq]] first as it answers many common questions about the HTML4 "rel" and "rev" attributes, and their linktype values.  If you have a new question to ask, first consider asking on the [http://microformats.org/mailman/listinfo/microformats-discuss/ microformats-discuss list].
This document serves to answer and discuss frequently asked questions specifically about the [[rel-tag]] microformat. You may want to read the [[rel-faq]] first as it answers many common questions about the HTML4 "rel" and "rev" attributes, and their linktype values.  If you have a new question to ask, first consider asking on the [http://microformats.org/mailman/listinfo/microformats-discuss/ microformats-discuss list].


== Q&A ==
== Q
 
# ''Where does a tagging link belong? Does the tagging link only need to appear in my Web feed (RSS / Atom)?  Does the tagging link need to appear on the page where my specific blog entry lies?  Does the tagging link need to appear everywhere that I can possibly imagine?''
#* In short, tagging links belong in all the places and formats in which you published tagged content. The Web page is the primary location where users read content and where search engines index. Thus the Web page is a place where you should absolutely include your [[rel-tag]] links. To tag your blog posts, put the [[rel-tag]] links inside them, visibly. The Web feeds are simply alternate ways of publishing your blog posts, and thus should include the full content of your blog posts, [[rel-tag]] links intact.
# ''Where shouldn't I use rel-tag?''
#* rel-tag expresses a particular relationship (a) between the page you are on and (b) the target of a link. If you're not asserting this relationship, don't use rel-tag. In particular:
#** don't use rel-tag in [http://en.wikipedia.org/wiki/Tag_cloud Tag Clouds]
#** don't use rel-tag to refer to the pages http://www.technorati.com/tag/xyz, http://del.icio.us/tag/xyz, http://www.flickr.com/photos/tags/xyz/ (and so forth) if you're not asserting "this page is tagged 'xyz'"
# ''The format specifies that the tag must "come after the last / in the path". Will something like <code><nowiki>http://example.com/index.php/TAG</nowiki></code> work?  Or does it have to be a "real" directory or [http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html mod_rewrite]? -- [[User:Singpolyma|singpolyma]] 23:51, 24 Jan 2006 (PST)''
#* The key is the URL. Whether that URL is generated from a database or a directory does not matter. The URL matters.
#** My question, however, was about whether that URL form ( <code><nowiki>http://example.com/index.php/TAG</nowiki></code> ) would be valid, since there is the dot in "index.php".
#*** Yes, the URL in the example is valid (or legal or conformant or whatever you want to call it to minimize confusion). The dot (period, full stop, U+002E) is free to appear in most places in a URL, even in the middle of a path-segment that is not the last path-segment. (The latest specification for URLs, "[http://gbiv.com/protocols/uri/rfc/rfc3986.html Uniform Resource Identifier (URI): Generic Syntax]", is RFC 3986.)
# ''I'm developing a web application which uses tagging, and so of course I want to use [[rel-tag]]. For this application, I want nice, clean URLs. I was planning to use [http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html mod_rewrite] to map a clean URL onto my underlying scripts. How do I use Apache's [http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html mod_rewrite] to map <code><nowiki>http://example.org/~user/app/tag/car</nowiki></code> to <code><nowiki>http://example.org/~user/app/script.php?tag=car</nowiki></code> ?''
#* One solution involves changing the script to inspect the path for the tag (via the variable "PATH_INFO"), rather than inspecting the query:
<pre><nowiki><Directory "/home/user/public_html/app/>
    RewriteEngine On
    RewriteRule ^tag/([^/]+)$ script.php/$1 [last]
</Directory></nowiki></pre>
#* For people who can edit the server's main configuration file, the following untested configuration code may work. Corrections are welcome.
<pre><nowiki>RewriteEngine On
RewriteMap tag int:escape
RewriteRule ^/~user/app/tag/([^/]+)$ /~user/app/script.php?tag=${tag:$1} [last]</nowiki></pre>
#* The following configuration code, left over from a previous contribution to this document, does a poor job according to tests. The following code fails to enforce the [[rel-tag]] rules about the tag corresponding to the last non-empty path-segment. The following code fails to transcode the tag for safe use in the URL query. Consider that a request on <code><nowiki>http://example.org/~user/app/tag/</nowiki></code> would map internally to a request on <code><nowiki>http://example.org/~user/app/script.php?tag=</nowiki></code> . Consider that a request on <code><nowiki>http://example.org/~user/app/tag/not-a-tag/the-tag</nowiki></code> would map internally to a request on <code><nowiki>http://example.org/~user/app/script.php?tag=not-a-tag/the-tag</nowiki></code> . Consider that a request on <code><nowiki>http://example.org/~user/app/tag/the-tag/</nowiki></code> would map internally to a request on <code><nowiki>http://example.org/~user/app/script.php?tag=the-tag/</nowiki></code> . Consider that a request on <code><nowiki>http://example.org/~user/app/tag/attack&intent=destroy</nowiki></code> would map internally to a request on <code><nowiki>http://example.org/~user/app/script.php?tag=attack&intent=destroy</nowiki></code> .
<pre><nowiki><Directory "/home/user/public_html/app/>
    RewriteEngine On
    RewriteRule ^tag/(.*)$ script.php?tag=$1
</Directory></nowiki></pre>
<ol start="4">
<li>''Does a rel tag still have meaning if the link redirects? If the HTTP server returns a 302 status code, does the rel-tag have meaning? Is there a formal rule that indexers should follow the link to the final, resolved destination? Or is there a formal rule that a rel tag should be ignored if URL of its link does not return a status code of 200?''
* Only the linked URL is important. The document specified by the URL, including any HTTP headers it contains are irrelevant. The whole point of rel-tag is that user-agents can figure out the name of the tag from the URL without having to make a request for the page linked to. [[User:TobyInk|TobyInk]] 03:56, 10 Aug 2007 (PDT)
</li>
</ol>
 
===CSS selector===
*How do you write a CSS selector for rel-tag?
** <code>a[rel~="tag"] { color: green }</code>
 
===Are tags case sensitive?===
*Are tags case sensitive. Is "Dog" the same tag as "dog" and "DOG"?
**{{AwaitingAnswer}}
 
===Multi-word tags===
*How should a multi-word tag be made? For instance, if using Wikipedia as a name space, a page about a Black Redstart (a bird) would be tagged '''Black_Redstart''', with an underscore [http://en.wikipedia.org/wiki/Black_Redstart]. Is there any way of aliasing alternatives ("BlackRedstart", "Black-Redstart", etc.)? Is any particular format preferable?
** Existing bevavior
*** delicious supports combined tags
*** flickr supports multi-word tags with spaces but collapses spaces when searching
*** ma.gnolia supports multi-word tags with spaces
*** technorati supports multi-word tags with spaces
**{{AwaitingAnswer}}
 
===Tags with file extensions===
*Is <code><a rel="tag" href="<nowiki>http://example.com/cheese.htm</nowiki>">cheese</a></code> a valid tag for "cheese"? Ditto ".asp" or ".php" variants? If not, why not?
 
Any file-name extension in the last path segment is part of the tag value:
 
*<nowiki>http://example.com/cheese.htm</nowiki> ⇒ cheese.htm
*<nowiki>http://example.com/cheese.asp</nowiki> ⇒ cheese.asp
*<nowiki>http://example.com/cheese.php</nowiki> ⇒ cheese.php
 
The [[rel-tag|rel-tag specification]] is clear on how to extract a tag from a URL. Special treatment for file-name extensions is not part of the extraction. Brian Suda gave an [http://microformats.org/discuss/mail/microformats-discuss/2007-February/008538.html explanation on the microformats-discuss list]. Consider the following URLs, the tags that the following URLs give under the current specification, and the effect of requiring special treatment for file-name extensions on the tags that the following URLs give.
 
*http://en.wikipedia.org/wiki/.htaccess
*http://en.wikipedia.org/wiki/.Net
*http://en.wikipedia.org/wiki/India.Arie
*http://en.wikipedia.org/wiki/ASN.1
*[http://en.wikipedia.org/wiki/L.I.E. http://en.wikipedia.org/wiki/L.I.E.]
 
===What about Scope?===
Since rel-tag is a feature used in many other microformats, the question often arises: "What is the scope of the tag?" For instance, a rel-tag may appear inside of an [[xfolk xFolk]] entry and on first glance it may appear that the tag should only apply to that entry. However, current publishing practice seems to indicate anything appearing on a page is likely related to the content of the page. Therefore, the interpretation is that not only does the rel-tag apply its direct container but to all containers and to the document as a whole; it contains the xFolk entry. This is a departure from strict knowledge theory in favor of real-world usage.
 
As another example, you may link to your friend Joe with XFN and hCard, indicating in his categories that Joe is interested in swimming, which you loathe. Since the article is primarily about you and not about Joe's hobbies and because the rel-tag is inside an hCard, you may expect that the rel-tag does not apply to the document; however, the document does contain information about swimming,  albeit tiny, namely that your friend likes it. In this way, rel-tag is binary: it indicates direction (yes or no) but not magnitude. This equivalent to a free-text search sans [[http://en.wikipedia.org/wiki/tf-idf tf-idf]]; i.e. without a notion of term relevance.
 
The upshot of this is that rel-tags can have downward scope but not upward scope.
 
===Encoding and decoding the tag text in JavaScript===
If you want to get the text of the tag using JavaScript, you should use decodeURIComponent() to get a text representation of the tag, not escape. decodeURIComponent will properly handle UTF-8.
 
==Related pages==
{{rel-tag-related-pages}}
**{{AwaitingAnswer}}

Revision as of 17:44, 12 August 2007

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This document serves to answer and discuss frequently asked questions specifically about the rel-tag microformat. You may want to read the rel-faq first as it answers many common questions about the HTML4 "rel" and "rev" attributes, and their linktype values. If you have a new question to ask, first consider asking on the microformats-discuss list.

== Q