Metadata – What is it, and why we need it. By: Roman Olschanowsky firstname.lastname@example.org. Metadata - data about data?. System metadata (most file systems) Developed for OS, not very helpful to you Size, owner, permissions, timestamps, … Standardized metadata
By: Roman Olschanowsky
Q: If all I have is a plain file system, how do I do metadata?
A: Organization, build a meaningful hierarchy
BIRN Human Collection and Metadata hierarchy
Analyses on many subjects across institutions
Analyses on a subject across institutions and studies
Analyses on many series of a subject within an institution
Analyses on muliple Series done at 1 institution
Analyses on images from this Series
Original is a pointer to the corresponding original scanner format
Should analyses that cross multiple data levels be split out to separate hierarchy?
All Analysis collections are writeable so that users can create their own analysis collections (snapshots)
(Visit__Site ID_Visit #)
nc_expSegment and [protocol section]
Separate the native data and analysis for easier access control and separation (Brian’s email)
Native Data: Represents an upload of the “original data”
Analysis: Represents a different analysis (either partial or full)
[research and derived data sections]
• • •
Derived versions of an individual series should remain with that series?
Why are you calling it “skull thickness”?
It’s suppose to be “cranial thickness”!
You have to query on “brain”, not “purkinje cell”
But, a “purkinje cell” is part of the “brain” shouldn’t the system know that?
For AI systems, what "exists" is that which can be represented. When the knowledge about a domain is represented in a declarative language, the set of objects that can be represented is called the universe of discourse.
We can describe the ontology of a program by defining a set of representational terms. Definitions associate the names of entities in the universe of discourse (e.g. classes, relations, functions or other objects) with human-readable text describing what the names mean, and formal axioms that constrain the interpretation and well-formed use of these terms.
Formally, an ontology is the statement of a logical theory.
Purkinje Cell Layer