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    • CommentRowNumber1.
    • CommentAuthorTobyBartels
    • CommentTimeNov 25th 2009

    I see a lot of links to plural titles that don't work, either because the singular title doesn't exist or (worse!) because it does exist but doesn't have a plural redirect. If you make a link to a plural title (or a capitalised one, or one with non-American spelling like ‘capitalised’, or that otherwise violates the naming conventions, then please make sure that it actually works! If not, either add the redirect (if there is a page to add it to) or change it to a pipe link ([[like|this]], which produces ‘this’) to the singular (uncapitalised, American, etc) title.

    If I find these, then I fix them; no harm done. But the danger is that somebody will first follow your link and create a new page there. If there is already a page on that subject (a page with a suspiciously similar title), then this condemns them to a duplication of effort, which you can avoid by checking the links that you create.

    While I'm on the subject, it's also helpful to check that your external links also work. If you make a typo in the URI, then the next reader might be able to figure out what you meant; but you should know, so it's best if you check yourself. Just click on them, and make sure that they go where you intended.

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeNov 25th 2009
    • (edited Nov 25th 2009)

    Here is another Warning:

    linking to subsections of entries apparently can't be trusted. I am not sure how it works internally, but the link names for the subsection anchors change apparently when an entry is edited, even if the subsection title in question remains the same.

    For instance the section "Dugger's theorem" at combinatorial model category used to be at

    http://ncatlab.org/nlab/show/combinatorial+model+category#duggers_theorem_13

    but now it seems it is at

    http://ncatlab.org/nlab/show/combinatorial+model+category#duggers_theorem_9 .

    That's a pain, because I had used links in other entries using this URL. They are all broken now.

    • CommentRowNumber3.
    • CommentAuthorTobyBartels
    • CommentTimeNov 25th 2009
    • (edited Nov 25th 2009)

    @ Urs

    As you can see by the ends of those URIs, the internal anchors have, in addition to the name of the section, its ordinal rank. They skip numbers sometimes (which I don't understand), but mostly things get messed up when you add or remove sections.

    The reason for this is probably in case several sections have the same name (which often happens for us). At least the links get you to the correct page and never send you to the wrong section.

    • CommentRowNumber4.
    • CommentAuthorMike Shulman
    • CommentTimeNov 25th 2009
    It's a shame that there isn't a markdown syntax to put an <a name="..."> tag after a heading, so that you could be sure of having a reliable external anchor. Is there?
    • CommentRowNumber5.
    • CommentAuthorTobyBartels
    • CommentTimeNov 25th 2009
    • (edited Nov 25th 2009)

    There is; it's

    ## Heading {#anchor}
    

    (I just looked this up and tested it.)

    • CommentRowNumber6.
    • CommentAuthorUrs
    • CommentTimeNov 25th 2009

    Right, that's the way I did the tocs before the arrival of the automatic toc.

    Okay, so I need to fall back to putting section anchor names by hand. All right.

    • CommentRowNumber7.
    • CommentAuthorUrs
    • CommentTimeNov 26th 2009
    • (edited Nov 26th 2009)

    The best thing of course would be if there'd be a wikilink-way of linking to subsection, by

    entryname#subsection

    • CommentRowNumber8.
    • CommentAuthorMike Shulman
    • CommentTimeNov 26th 2009
    Or, at least anchor names for the sections you want to refer to externally.

    It is odd that there isn't a wikilink syntax for subsection links.
    • CommentRowNumber9.
    • CommentAuthorAndrew Stacey
    • CommentTimeNov 26th 2009

    Maybe there should be. Would this be high on people's wishlist?

    • CommentRowNumber10.
    • CommentAuthorUrs
    • CommentTimeNov 26th 2009
    • (edited Nov 26th 2009)

    In some way it's not very important. I have for instance now by hand named the relevant sections that I wanted to link to and have now stable links to them. The user won't notice the difference to any other solution.

    However, in the long run it bothers me a bit that this way all links to sections wil be regarded by the software as not on the same footing as wiki-links, even though they should be.

    Given that we have redirects, the backtrack-mechanism (pages knowing which pages they are being linked to from) is currently not de facto available, but I presume in principle. It would, in the long run, be good if the same werer true for links to sections.

    • CommentRowNumber11.
    • CommentAuthorTobyBartels
    • CommentTimeNov 26th 2009

    Yeah, I'd like section links and backtracks through redirects. And backtracks through section links.