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In page Multitier architecture:
"The infrastructure layer can be partitioned into different levels (high-level or low-level technical services).[5] Developers often focus on the persistence (data access) capabilities of the infrastructure layer and therefore only talk about the persistence layer or the data access layer (instead of an infrastructure layer or technical services layer). In other words, the other kind of technical services is not always explicitly thought of as part of any particular layer.[citation needed]
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