rule-engine

Does anyone know of a good .NET library rules library (ideally open-source)? I need something that can do nested logic expressions, e.g., (A AND B) AND (B OR C OR D). I need to do comparisons of object properties, e.g., A.P1 AND B.P1. (Ideally, I could compare any property -- A.P1 AND B.P2). It should store the rules in a database (I've got a lot of simple configurable logic). And it should have a rule creation/management API. The management tool would have to inspect the instances to determine which properties are available and which constraints exist. Thanks! Oh, one more thing. As a rules

I am exploring different ways to create a simple business rule engine in Java. I need to present the client with a simple webapp that lets him configure a bunch of rules. A sample of rule base might look like this : Here's example: IF (PATIENT_TYPE = "A" AND ADMISSION_TYPE="O") SEND TO OUTPATIENT ELSE IF PATIENT_TYPE = "B" SEND TO INPATIENT The rule engine is pretty simple, the final action could be just one of two actions, sending to inpatient or outpatient. The operators involved in an expression could be =,>,<,!= and logical operators between expressions are AND, OR and NOT . I want to

I'm auditing a project that uses what is called a Rules Engine . In short, it's a way to externalize business logic from application code. This concept is entirely new to me and I'm pretty skeptical about it. After hearing people talk about Anemic Domain Models for the past few years, I'm questioning the Rules Engine Approach. To me they seem like a great way to WEAKEN a domain model. For example say I'm doing a java webapp interacting with a Rules Engine. Then I decide I want to have an Android app based on the same domain. Unless I want the Android app to interact with the Rules Engine as

I have a db table that stores the following: RuleID objectProperty ComparisonOperator TargetValue 1 age 'greater_than' 15 2 username 'equal' 'some_name' 3 tags 'hasAtLeastOne' 'some_tag some_tag2' Now say I have a collection of these rules: List<Rule> rules = db.GetRules(); Now I have an instance of a user also: User user = db.GetUser(....); How would I loop through these rules, and apply the logic and perform the comparisons etc? if(user.age > 15) if(user.username == "some_name") Since the object's property like 'age' or 'user_name' is stored in the table, along with the comparison operater