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Avro kernel classes.
A {@link org.apache.avro.Schema} provides an abstract definition of
a data type.
The in-memory representation of data is determined by {@link
org.apache.avro.io.DatumReader} and {@link
org.apache.avro.io.DatumWriter} implementations. Generic
implementations are provided in the {@link org.apache.avro.generic}
package. A {@link org.apache.avro.compiler.specific.SpecificCompiler
compiler} can generate specific java classes and interfaces for
schemas and protocols. Schemas may be automatically generated for
existing Java classes by reflection using the {@link
org.apache.avro.reflect} package.
Data of a given schema is always serialized identically, regardless
of its in-memory representation, by traversing the schema and
writing leaf values from the data structure with a {@link
org.apache.avro.io.Encoder}. Deserializing similarly proceeds by
traversing the schema, reading leaf values with a {@link
org.apache.avro.io.Decoder} and storing them in an in-memory data
structure.