Permalink
A permalink ( permanent- and hyperlink, also permanent link) on the World Wide Web is a permanent identifier in the form of a URL. When setting up a permalinks, the aim is to make the once referenced him permanently and content available primarily via this URL.
Unlike permalinks can vary the content behind a normal URL, or the URL itself can be changed by the webmaster, so that about retrievable contents are no longer or only at a different address available. References to this URL will then point to dead links or other content.
- 4.1 Labelling
Example
When the news and thus, different content at a URL like http://www.example.com/aktuelles depending on the release date, this URL is not a permalink. If, however, the news one day made using a URL, as summarized for example http://www.example.com/aktuelles/20091206 and permanently available, there is a permalink.
Permalinks in Blogs
Permalinks are mainly used in blog systems to replace references to other entries in weblogs to link. Modern Blog systems and blog service provider automatically create permalinks. Also, content management systems generate permalinks for -created content. Often speaking names for permalinks are generated which include the article title in the address. Another common format uses a time stamp indicating the time at which has been posted on the internet of products to create a unique permalink. In part, simply reference numbers are assigned.
Permalinks are also used in RSS or Atom feeds, to refer to the original entry in the weblog.
Permalinks in library catalogs
Permalinks are also used for closed caption data in library catalogs in order to enable a reference to the entry. The goal is less to reference the status quo of the entry because the entry does not change in the rule; Rather, the effort for a new database search is to be saved.
Origin
The term " permanent link" is a portmanteau of "permanent" and "hyperlink ". On the World Wide Web became popular permalinks under this name primarily through the use of the linking of individual contributions in weblogs; However, the principle of referencing a resource clearly and permanently via a URL is already created in the basics of the WWW.
Principle
Permalinks are intended to ensure that the referenced objects are both rather than getting a single URL linked in various forms and on the other, that the addresses remain permanently preserved in this form. In contrast to more sophisticated systems such as PURL or DOI pursuing similar goals, there are no uniform guidelines and measures to ensure the uniqueness and persistence for permalinks. Since permalinks can be assigned easily and uncontrollably, though, they have established themselves as a pragmatic solution in many areas.
Implementation
Identification
If a website's content through multiple URLs offered, it is often pointed with descriptions such as " Permalink " or " citable Link" is the canonical Permalink linking and quoting. Probably on Tantek Çelik the practice goes back permalinks to identify blogs with the link type Bookmark the Hypertext Markup Language, which was introduced in version 4.0 of the standard:
- Long-term archiving
- Identifier # Persistence
- Linked Open Data
- Representational State Transfer (REST)
- Surface and Deep Links Links