See File systems Types of file systems. See Disk cloning Disk cloning software. See S. GUI Applications. See File recovery List of utilities. See also Category:Status monitoring and notification. See also Wikipedia:Font management software. See man page Viewer applications. See Time synchronization. See Xrandr Graphical front-ends. See Backlight Backlight utilities. See Power management Userspace tools. See pacman tips Utilities.
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Navigation menu Personal tools Create account Log in. Namespaces Page Discussion. Metadata that describes geographic objects in electronic storage or format such as datasets, maps, features, or documents with a geospatial component has a history dating back to at least refer MIT Library page on FGDC Metadata. This class of metadata is described more fully on the geospatial metadata article. Ecological and environmental metadata is intended to document the "who, what, when, where, why, and how" of data collection for a particular study.
This typically means which organization or institution collected the data, what type of data, which date s the data was collected, the rationale for the data collection, and the methodology used for the data collection. Metadata should be generated in a format commonly used by the most relevant science community, such as Darwin Core , Ecological Metadata Language , [81] or Dublin Core. Metadata editing tools exist to facilitate metadata generation e.
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Metavist, [82] Mercury , Morpho [83]. Metadata should describe provenance of the data where they originated, as well as any transformations the data underwent and how to give credit for cite the data products. Shortly thereafter, it became common for personal computers to retrieve metadata from external sources e. Digital audio formats such as digital audio files superseded music formats such as cassette tapes and CDs in the s.
Digital audio files could be labelled with more information than could be contained in just the file name. That descriptive information is called the audio tag or audio metadata in general. Computer programs specializing in adding or modifying this information are called tag editors. Metadata can be used to name, describe, catalogue and indicate ownership or copyright for a digital audio file, and its presence makes it much easier to locate a specific audio file within a group, typically through use of a search engine that accesses the metadata.
As different digital audio formats were developed, attempts were made to standardize a specific location within the digital files where this information could be stored.
As a result, almost all digital audio formats, including mp3 , broadcast wav and AIFF files, have similar standardized locations that can be populated with metadata. The metadata for compressed and uncompressed digital music is often encoded in the ID3 tag. With the availability of cloud applications, which include those to add metadata to content, metadata is increasingly available over the Internet. Metadata can be stored either internally , [87] in the same file or structure as the data this is also called embedded metadata , or externally , in a separate file or field from the described data.
A data repository typically stores the metadata detached from the data, but can be designed to support embedded metadata approaches. Each option has advantages and disadvantages:. Metadata can be stored in either human-readable or binary form. Storing metadata in a human-readable format such as XML can be useful because users can understand and edit it without specialized tools.
A binary metadata format enables efficiency in all these respects, but requires special software to convert the binary information into human-readable content. Each relational database system has its own mechanisms for storing metadata. Examples of relational-database metadata include:. In database terminology, this set of metadata is referred to as the catalog. The SQL standard specifies a uniform means to access the catalog, called the information schema , but not all databases implement it, even if they implement other aspects of the SQL standard.
For an example of database-specific metadata access methods, see Oracle metadata. Here, the knowledge of all Mankind is condensed into an object the size of a desk drawer, however the magnitude of the metadata e. The story prefigures the modern consequences of allowing metadata to become more important than the real data it is concerned with, and the risks inherent in that eventuality as a cautionary tale.
From Wikipedia, the free encyclopedia. Main article: Data virtualization. The examples and perspective in this article may not represent a worldwide view of the subject.
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