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El Metadato y sus características. August 26, 2007

Filed under: Joseba Abaitua - Digital Resources Management — juanitabanana @ 11:04 am

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

Definición:

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Metadatos (del griego μετα, meta, «después de» y latín datum, «lo que se da», «dato»), literalmente «sobre datos», son datos que describen otros datos. En general, un grupo de metadatos se refiere a un grupo de datos, llamado “recurso”.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             El concepto de metadatos es similar al uso de índices para localizar objetos en vez de datos. Por ejemplo, en una biblioteca se usan fichas que especifican autores, títulos, casas editoriales y lugares para buscar libros. Así, los metadatos ayudan a situar datos.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Para varios campos de la informática (como la recuperación de la información) los metadatos son un enfoque importante para construir un puente sobre el intervalo semántico.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Distinción entre datos y metadatos:

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       La mayoría de las veces no es posible diferenciar entre datos y metadatos. Por ejemplo, un poema es un grupo de datos, pero también puede ser un grupo de metadatos si está adjuntado a una canción que lo usa como texto.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Muchas veces, los datos son tanto “datos” como “metadatos”. Por ejemplo, el título de un texto es parte del texto como a la vez es un dato referente al texto (Dato como Metadato)

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

Metadatos sobre metadatos:

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Debido a que los metadatos son datos en sí mismos, es posible crear metadatos sobre metadatos. Sin embargo, a primera vista, parece una tontería, pero es verdad que los metadatos sobre metadatos pueden ser muy útiles. Por ejemplo, si juntamos dos imágenes y sus metadatos distintos; nos damos cuenta que puede ser muy importante deducir cual es el origen de un grupo de metadatos.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Objetivos:

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    El uso de los metadatos mencionado más frecuentemente es la refinación de consultas a buscadores. Usando informaciones adicionales los resultados son más precisos, y el usuario se ahorra filtraciones manuales complementarias.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             El intervalo semántico plantea el problema de que el usuario y el ordenador no se entiendan. El problema está en que el ordenador no comprenda el significado de los datos. Es posible que los metadatos posibiliten la comunicación declarando cómo están relacionados los datos. Por eso la representación del conocimiento usa metadatos para categorizar informaciones.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Los metadatos facilitan el flujo de trabajo convirtiendo datos automáticamente de un formato a otro. Para eso es necesario que los metadatos describan contenido y estructura de los datos. 

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Algunos metadatos hacen posible una comprensión de datos más eficaz. Por ejemplo, si en un vídeo, el software sabe distinguir el primer plano del fondo, puede usar algoritmos de compresión diferentes y así mejorar la cuota de compresión.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Hasta esta fecha, esta es una de las ideas más extendidas, pero hay muchas más.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Enlaces externos:

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Fuente:       

  • Metadato. Wikepedia. La Enciclopedia libre. Fecha de consulta: el 26 de agosto, 2007 a las 11:03 en: Wikipedia.   
 

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