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<title>Expert: attributes streaming definition for indexing facets</title>
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<h1>Expert: attributes streaming definition for indexing facets</h1>
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Steaming of facets attributes is a low level indexing interface with Lucene indexing.
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There are two types of category related streams:
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<li><b>Category tokenizer stream</b> handles tokenization for a single category,
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e.g. for creating drill-down tokens.</li>
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<li><b>Category list tokenizer stream</b> handles tokenization for multiple categories,
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e.g. for creating a counting list token, representing all the categories of
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a certain document.</li>
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