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Descriptive metadata is typically used for discovery and identification, as information to search and locate an object, such as title, author, subjects, keywords, publisher.
Structural metadata describes how the components of an object are organized.
There are different metadata standards for each different discipline (e.g., museum collections, digital audio files, websites, etc.).
Describing the contents and context of data or data files increases its usefulness.
Metadata assists users in resource discovery by "allowing resources to be found by relevant criteria, identifying resources, bringing similar resources together, distinguishing dissimilar resources, and giving location information." Metadata of telecommunication activities including Internet traffic is very widely collected by various national governmental organizations.
In these fields the word metadata is defined as "data about data".
While this is the generally accepted definition, various disciplines have adopted their own more specific explanation and uses of the term.
Metadata within web pages can also contain descriptions of page content, as well as key words linked to the content.
For example: by itself, a database containing several numbers, all 13 digits long could be the results of calculations or a list of numbers to plug into an equation - without any other context, the numbers themselves can be perceived as the data.