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   1 #  class ion\Catalog implements Countable
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   3 The Catalog holds a collection of ion\Symbol\Table instances queried from ion\Reader and ion\Writer instances.
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   7 See also [the ION spec's symbol guide chapter on catalog.](https://amzn.github.io/ion-docs/docs/symbols.html#the-catalog).
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  10 ## Constants:
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  12 None.
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  14 ## Properties:
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  16  * private array $symbolTables = array (
  17 )
  18   Internal cache.
  19