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Logical Data Models |
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Submitted by dmreview.com
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Logical data modeling (LDM) is the well-accepted practice of designing business data models that are independent of application and physical database implementations. LDMs are conceived by data architects, business analysts and end users who analyze business processes and information for the purpose of defining a harmonized (logical) data model that represents the business. The models are designed from the business top down, and the business information is not influenced by applications or database implementation. Free of these complications, assumptions and constraints, the LDM is a harmonized, uncoupled data model.
LDMs are typically defined by the business and act as the contract for creating a physical database implementation. What if the LDM was used to persist data to the network instead of a database? This is exactly the kind of change control that is needed for exchanging information with an SOA. By using the LDM, the business can create a contract for the SOA data exchange layer. This contract will help with versioning and let the business define the system from the top down.
The reason these people are disconnected is they don’t agree on the modeling technique. The data architect uses relational data modeling tools to describe business information, while the SOA architect uses object modeling tools to describe business objects. The problem that both groups are struggling with is how to represent their information in a canonical format for purposes of exchange within an SOA implementation.
The solution is that both parties need to represent their information in a hierarchical format for the purpose of exchanging business information with XML. What the SOA architects don’t know is that relational data, when normalized, contains natural hierarchies that can represent business objects.
Full article available at Logical Data Models for SOA Information Exchange
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