I have been spending some time in the Wiki recently cleaning up a lot of tags, mostly emergency= and vending=. The one thing I noticed over and over again was that the lack of a initial tag page often causes problems that could have been easily avoided (Translation errors, different understandings how to use a tag or even definitions on different wiki pages). It also allows you to link to similar tags (or be liked to), proposals, wikiepdia pages etc. which helps a lot.
Creating a new page
There are a lot of different ways, the easiest is probably that you just klick on a tag red link. Another option is to open a similar tag and just change the URL or just replace it here http://wiki.openstreetmap.org/wiki/Tag:KEY=VALUE and hit enter.
Always use the Template
- http://wiki.openstreetmap.org/wiki/Template:ValueDescription (k=v)
- http://wiki.openstreetmap.org/wiki/Template:KeyDescription (k)
99.99% of the time you need the first one. Just copy the whole first column from the grey table into the empty wiki page you created. Now you should at least always add key= & value= One of the main benefits of the template is that it includes the language bar. It's also from where taginfo gets its description.
DO NOT DELETE ANY LINES YOU LEFT EMPTY! It does not have any negative impact. There is nothing more annoying than wanting to improve a page later and you have to go to the template and find the parameter.
Add images, especially in the template. Especially with all the translation errors this can go a long way.
Upload file: http://wiki.openstreetmap.org/wiki/Special:Upload
But you can also link to any file from wiki commons (commons.wikimedia.org). Best way to find images is with google: