1 / 9

Essentials of the Topic Maps Reference Model (TMRM)

Essentials of the Topic Maps Reference Model (TMRM). Patrick Durusau Snowfall Software Steve Newcomb Coolheads Consulting. Basic Principles. One subject – Many Identifications No one identification is privileged

tague
Download Presentation

Essentials of the Topic Maps Reference Model (TMRM)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Essentials of the Topic Maps Reference Model (TMRM) Patrick Durusau Snowfall Software Steve Newcomb Coolheads Consulting

  2. Basic Principles • One subject – Many Identifications • No one identification is privileged • A single subject representative can contain multiple, independent identifications of the represented subject • Ex: TMDM: Set of subject identifiers • Identity of a subject is divorced from the identity of its representative

  3. Basic Constructs • Subject Proxies (proxies) • Composed of properties (key/value pairs) • No restrictions on values • One restriction on keys (see next line) • All keys are labels and every proxy has a unique label • Result is that a key is always a label for a proxy (enables introspection)

  4. Why Introspection? • GTE merged 40 databases with 27,000 different elements • Est. time without original authors, 12 person years • Reason? No introspection of the element names (no where to look) • No guarantee of useful introspection, but the mechanism is present

  5. Why Introspection? II • If no introspection, how to determine if merging should occur if keys are different? • Recall all subjects can have multiple identifications • Includes subjects represented by proxies whose labels appear as keys • Can add identifications to those proxies

  6. Primitive Navigation • Define sub (subclass of) and isa (instance of) • Four primitive navigation operators • All the keys of a proxy • All proxies where a proxy (its label actually) is the value in another proxy • All the values for a key in a proxy • All the proxies with a given value for a particular key

  7. Constraints and Merging • Constraints: rules for any map m • Define: • Application of a constraint to a map • Application of a merging operator between two maps • Merging operator (after merging of maps) • But, the TMRM doesn’t define any constraints or merging operators

  8. Subject Map Legends • And what of interchange? • Legends are finite sets of constraints governing the interpretation of a map • Constraints and hence legends are not constrained by the TMRM • TMDM is an example of a legend, rules for merging, etc.

  9. Questions?

More Related