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2015-07-31 19:26:23 +00:00
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<title>FlatBuffers: Grammar of the schema language</title>
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2014-01-28 00:52:49 +00:00
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2015-08-06 00:32:14 +00:00
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2014-01-28 00:52:49 +00:00
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<div class="title">Grammar of the schema language </div> </div>
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<div class="textblock"><p>schema = include* ( namespace_decl | type_decl | enum_decl | root_decl | file_extension_decl | file_identifier_decl | attribute_decl | object )*</p>
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<p>include = <code>include</code> string_constant <code>;</code></p>
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<p>namespace_decl = <code>namespace</code> ident ( <code>.</code> ident )* <code>;</code></p>
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<p>attribute_decl = <code>attribute</code> string_constant <code>;</code></p>
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<p>type_decl = ( <code>table</code> | <code>struct</code> ) ident metadata <code>{</code> field_decl+ <code>}</code></p>
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<p>enum_decl = ( <code>enum</code> | <code>union</code> ) ident [ <code>:</code> type ] metadata <code>{</code> commasep( enumval_decl ) <code>}</code></p>
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<p>root_decl = <code>root_type</code> ident <code>;</code></p>
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<p>field_decl = ident <code>:</code> type [ <code>=</code> scalar ] metadata <code>;</code></p>
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<p>type = <code>bool</code> | <code>byte</code> | <code>ubyte</code> | <code>short</code> | <code>ushort</code> | <code>int</code> | <code>uint</code> | <code>float</code> | <code>long</code> | <code>ulong</code> | <code>double</code> | <code>string</code> | <code>[</code> type <code>]</code> | ident</p>
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<p>enumval_decl = ident [ <code>=</code> integer_constant ]</p>
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<p>metadata = [ <code>(</code> commasep( ident [ <code>:</code> single_value ] ) <code>)</code> ]</p>
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<p>scalar = integer_constant | float_constant</p>
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<p>object = { commasep( ident <code>:</code> value ) }</p>
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<p>single_value = scalar | string_constant</p>
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<p>value = single_value | object | <code>[</code> commasep( value ) <code>]</code></p>
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<p>commasep(x) = [ x ( <code>,</code> x )* ]</p>
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<p>file_extension_decl = <code>file_extension</code> string_constant <code>;</code></p>
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<p>file_identifier_decl = <code>file_identifier</code> string_constant <code>;</code></p>
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<p>integer_constant = -?[0-9]+ | <code>true</code> | <code>false</code></p>
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<p>float_constant = -?[0-9]+.[0-9]+((e|E)(+|-)?[0-9]+)? </p>
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