Metadata

=__**Topic:**__ **Metadata**=



**__Description__**
Types of Meta Data
 * Metadata is "data about data".
 * Metadata provides information about a certain item's content.
 * It describes when, how, and by whom a certain set of data was formatted and collected.
 * Metadata is an essential component of the collection of storage in databases and data warehouses.
 * Example:
 * An image on a webpage may contain metadata describing how large it is, the image resolution, when the image was taken, and much more.
 * **Technical metadata** data structures such as: tables, fields, data types, indexes.


 * **Business metadata** what data you have. where it came from how it relates to the tables.


 * **Process metadata** describes operations in data warehouse. start time, end time, CPU seconds used, disk reads, disk writes and rows processed. Valuable to companies.

__**Applications**__
__**Purpose**__
 * 1) Resource description
 * 2) Information retrieval
 * 3) Management of information
 * 4) Rights management, ownership and authenticity
 * 5) Interoperability and e-commerce



**Practical Everyday Data**
>>>  >>>  >>>  >>>
 * **Google uses Metadata to return searches that compile:**
 * **Keyword text**
 * **Data embedded into the head of an HTML sheet**
 * ex:
 * **Hastags from Twitter & other Social Media**
 * **How to use metadata**
 * **Tag your tweets, post, & shares with relevant tags**
 * **Use between 80-120 characters for description, alt, title and other HTML tag attributes to add metadata that search engines can respond to**
 * **Use databases to search for specific criteria efficiently**



__**Related Links**__

 * http://en.wikipedia.org/wiki/Metadata
 * http://www.theguardian.com/technology/interactive/2013/jun/12/what-is-metadata-nsa-surveillance
 * https://www.fgdc.gov/metadata
 * http://www.wired.com/opinion/2013/06/phew-it-was-just-metadata-not-think-again/
 * http://www.loc.gov/standards/mets/
 * http://www.techterms.com/definition/metadata
 * http://aspiresquared.co.uk/2011/01/metadata-what-is-its-purpose/