Metadata Information about information. What is the information here? Say we have part of a data set: 449 5 7 31 31 18 17 What do these numbers signify?

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Presentation transcript:

Metadata Information about information

What is the information here? Say we have part of a data set: What do these numbers signify? Without additional information about the information, we have no idea.

What is the information here? Say we have some text: I have something to say to you -- a word in your ear! I greet you -- please pay attention! In my city people are dying, and hearts are full of distress. People are lost -- that fills me with (1 ms. adds wretched) dismay. I craned my neck over the city wall: corpses in the water make the river almost overflow. That is what I see. That will happen to me too -- that is the way things go. No one is tall enough to reach heaven; no one can reach wide enough to stretch over the mountains. Since a man cannot pass beyond the final end of life, I want to set off into the mountains, to establish my renown there. Where renown can be established there, I will establish my renown; and where no renown can be established there, I shall establish the renown of the gods. Without additional information about the information, the significance of this text is unclear.

Metadata At the most basic level, metadata is just another term for description, or information about an entity. For example, I open my dresser drawer and take out a sock: the sock color of the sock is white, material is cotton, and the length goes to my ankle.

Structured metadata Attributes—also known as characteristics, properties, or elements—are the categories we use to describe a specific kind of entity more precisely. Color, material, and length are attributes of socks. Values are a way to describe the possible contents of an attribute. White, cotton, and ankle are values of the Color, Material, and Length attributes.

Unstructured metadata We can also just apply values (tags) to entities without specifiying attributes. The metadata for a sock might then be: white cotton ankle

Problems with unstructured metadata What if my socks are tagged: Hot Normal Are my socks reeeaaally stylish and yet also utterly typical?

Examples of attribute/value pairs For socks, attribute/value pairs might be: AttributeValue ColorOne of a set of 128 color values (white) MaterialOne of a set of 15 fibers (cotton) LengthOne of a set of 5 lengths (ankle) The values here are controlled, or limited to a defined set of acceptable choices. Control can facilitate consistency.

More examples of attribute/value pairs For restaurants to which I might consider taking visitors to Austin, potential attribute/value pairs might be: AttributeValue Sense of placeA scale from 1-10 to represent the restaurant’s uniqueness as an Austin or Texas experience Grease quotientThe number of margaritas required to cut through the richness of the food Ease of transportA percentage that represents the likelihood that I can get us there, park, and get us home without harming us, others, or property

Schemas, or attribute sets A schema is a set of attributes and associated value parameters designed to describe a particular type of entity. Schemas may be encoded in a particular syntax for manipulation by people or computers. Schemas may also be associated with rules for creating records (that is, assigning attributes and values to specific resources).

Types of metadata Gilliland defines five types of metadata: Administrative. Descriptive. Preservation. Technical. Use.

Conflicting purposes for structured metadata Structured metadata can facilitate both exploitative and descriptive control, to use Wilson’s terminology. It can also facilitate interoperability. These goals may be at cross-purposes sometimes...