How to Build a Business Rules Engine

which is captured in data models that exist at the physical level (also known as the

“implementation level”).

Data models are typically built using database design practices based on con-

cepts of relational database theory. In practice this means that each piece of infor-

mation belongs in only one place in a database, that similar pieces of information

are grouped together, and that these groupings may be related by sharing common

pieces of information. These objects are discovered, recorded, and structured into

a design by a process called data modeling, which is part science and part art. It

is part science because there are rules that constrain how a database should be

built, and it is part art because it requires extracting complete and correct ...