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It is recommended to validate all AIPs on ingestion (when possible). But validation can be extremely slow, as each validation request first must download all references referenced Schema documents from various locations on the web (sometimes as many as 10 schemas may be necessary to download in order to validate a single METS file).

In order to perform validations in a speedy fashion, you can pull down a local copy of all schemas. Validation will then use this local cache, which can sometimes increase the speed up to 10X.

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