Tardis:Point of view

Unlike Wikipedia we write our articles from two different perspectives.

In-universe perspective
Articles about narrative elements — also called "in-universe articles" — are written as if the topic were real, but one that no longer exists. For this reason, they are written in the past tense.

Examples of in-universe articles include Amy Pond, Gallifrey, London, 2000, March and so forth. Note that even if the subject exists in the real world, like 2000, we still primarily write about it in an in-universe way. Doing so allows us to stress the importance of 2000 to the DWU. When we do so, we discover that the DWU has different characteristics to the real world.

Generally, in-universe articles have two distinct parts. The majority of the article — what we frequently refer to as the "body" — is written from this in-universe article. But these articles can have a section called "behind the scenes". This part of the article — which is always the last major section — is written from a "real world perspective". Read more ...

Out-of-universe perspective
Articles about out-of-universe things are also called "real world articles". Generally, these, too, should be written in the past tense, in order to minimise the amount of editing that has to be done on the article in the future. However, there are some instances in which the present tense may be warranted. Read more...

Example
The difference between an in-universe and out of universe perspective is immediately apparent from the first sentence of our article about the Doctor as compared with Wikipedia's article:

Note how the in-universe perspective allows the opportunity to declare what "the Doctor" actually is. It's not a character, not a person, but, in fact, an alias. That's something you can only easily note if you're writing as if the DWU is a "reality".

Conversely, the out-of-universe perspective affords a chance to note the real world significance of the "the Doctor" — which is that he is the central character of a multi-media franchise.