Clear Separation of Semantics and System-specific Constraints
Because metadata registries are used to store both semantics (the meaning of a data element) and systems-specific constraints (for example the maximum length of a string) it is important to identify what systems impose these constraints and to document them. For example the maximum length of a string should not change the meaning of a data element.
The International Organization for Standardization (ISO) has published standards for a metadata registry called ISO/IEC 11179 and also ISO15000-3 and ISO15000-4 ebXML registry and repository (regrep) EbXML RegRep
Read more about this topic: Metadata Registry
Famous quotes containing the words clear, separation and/or constraints:
“Parenting can be established as a time-share job, but mothers are less good “switching off” their parent identity and turning to something else. Many women envy the father’s ability to set clear boundaries between home and work, between being an on-duty and an off-duty parent.... Women work very hard to maintain a closeness to their child. Father’s value intimacy with a child, but often do not know how to work to maintain it.”
—Terri Apter (20th century)
“Last evening attended Croghan Lodge International Order of Odd Fellows. Election of officers. Chosen Noble Grand. These social organizations have a number of good results. All who attend are educated in self-government. This in a marked way. They bind society together. The well-to-do and the poor should be brought together as much as possible. The separation into classes—castes—is our danger. It is the danger of all civilizations.”
—Rutherford Birchard Hayes (1822–1893)
“The analogy between the mind and a computer fails for many reasons. The brain is constructed by principles that assure diversity and degeneracy. Unlike a computer, it has no replicative memory. It is historical and value driven. It forms categories by internal criteria and by constraints acting at many scales, not by means of a syntactically constructed program. The world with which the brain interacts is not unequivocally made up of classical categories.”
—Gerald M. Edelman (b. 1928)