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JSDAI Introduction 
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Overview of the SDAI management object
In the previous examples we already learned about:
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SdaiSession, the root from which every SDAI activity starts from
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Implementation, to provide version and level information of the implementation
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SdaiTransaction, to control simultaneous updating of changes
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SdaiRepository, the physical storage container for SchemaInstances and
SdaiModels
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SdaiModel, to group entity instances based on one express schema
Further management classes are
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SchemaInstance as a logical grouping of models to define a valid population
of an express schema
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EntityEntent, an auxiliary class to group entity instances of one entity
data type
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SdaiException, thrown in case of error conditions
The most important entities of the dictionary schema, needed for late binding
access, are:
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schema_definition
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entity_definition
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attribute
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