Java <a href="http://www.setgetweb.com/p/j2sdk141/serialization/spec/serial-arch.doc1.html">Object Serialization</a> Specification: 6

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6.4 Grammar for the Stream Format

The table below contains the grammar for the stream format. Nonterminal symbols are shown in italics. Terminal symbols in a fixed width font. Definitions of nonterminals are followed by a ":". The definition is followed by one or more alternatives, each on a separate line. The following table describes the notation:

Notation
Meaning

(datatype)

This token has the data type specified, such as byte.

token[n]

A predefined number of occurrences of the token, that is an array.

x0001

A literal value expressed in hexadecimal. The number of hex digits reflects the size of the value.

<xxx>

A value read from the stream used to indicate the length of an array.

Note that the symbol (long-utf) is used to designate a string written in "long" UTF format. For details, refer to Section 6.2, "Stream Elements".

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Notation	Meaning
(datatype)	This token has the data type specified, such as byte.
token[n]	A predefined number of occurrences of the token, that is an array.
x0001	A literal value expressed in hexadecimal. The number of hex digits reflects the size of the value.
<xxx>	A value read from the stream used to indicate the length of an array.