Document (#33265)

Author

Daniel Jr., R.
Lagoze, C.

Title

Extending the Warwick framework : from metadata containers to active digital objects

Source

D-Lib magazine. 3(1997) no.11, xx S

Year

1997

Abstract

Defining metadata as "data about data" provokes more questions than it answers. What are the forms of the data and metadata? Can we be more specific about the manner in which the metadata is "about" the data? Are data and metadata distinguished only in the context of their relationship? Is the nature of the relationship between the datasets declarative or procedural? Can the metadata itself be described by other data? Over the past several years, we have been engaged in a number of efforts examining the role, format, composition, and architecture of metadata for networked resources. During this time, we have noticed the tendency to be led astray by comfortable, but somewhat inappropriate, models in the non-digital information environment. Rather than pursuing familiar models, there is the need for a new model that fully exploits the unique combination of computation and connectivity that characterizes the digital library. In this paper, we describe an extension of the Warwick Framework that we call Distributed Active Relationships (DARs). DARs provide a powerful model for representing data and metadata in digital library objects. They explicitly express the relationships between networked resources, and even allow those relationships to be dynamically downloadable and executable. The DAR model is based on the following principles, which our examination of the "data about data" definition has led us to regard as axiomatic: * There is no essential distinction between data and metadata. We can only make such a distinction in terms of a particular "about" relationship. As a result, what is metadata in the context of one "about" relationship may be data in another. * There is no single "about" relationship. There are many different and important relationships between data resources. * Resources can be related without regard for their location. The connectivity in networked information architectures makes it possible to have data in one repository describe data in another repository. * The computational power of the networked information environment makes it possible to consider active or dynamic relationships between data sets. This adds considerable power to the "data about data" definition. First, data about another data set may not physically exist, but may be automatically derived. Second, the "about" relationship may be an executable object -- in a sense interpretable metadata. As will be shown, this provides useful mechanisms for handling complex metadata problems such as rights management of digital objects. The remainder of this paper describes the development and consequences of the DAR model. Section 2 reviews the Warwick Framework, which is the basis for the model described in this paper. Section 3 examines the concept of the Warwick Framework Catalog, which provides a mechanism for expressing the relationships between the packages in a Warwick Framework container. With that background established, section 4 generalizes the Warwick Framework by removing the restriction that it only contains "metadata". This allows us to consider digital library objects that are aggregations of (possibly distributed) data sets, with the relationships between the data sets expressed using a Warwick Framework Catalog. Section 5 further extends the model by describing Distributed Active Relationships (DARs). DARs are the explicit relationships that have the potential to be executable, as alluded to earlier. Finally, section 6 describes two possible implementations of these concepts.

Footnote

Vgl.: http://dlib.ukoln.ac.uk/dlib/november97/daniel/11daniel.html.

Theme

Metadaten

Object

Warwick framework

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4. Lagoze, C.: Keeping Dublin Core simple : Cross-domain discovery or resource description? (2001) 0.27

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5. Haslhofer, B.: ¬A Web-based mapping technique for establishing metadata interoperability (2008) 0.24

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