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The following table describes attributes that can be found in most of the data containers.

Attribute	Description
ucid	Unique document identifier based on country, doc-number and kind
mxw-id	Internal record-level identifier
load_source	Identifies the source of the data loaded into Alexandria and can have the following values: patent-office: It identifies documents published, usually weekly, by PTOs docdb: Weekly updates from the EPO product docdb/inpadoc translated: Human translated content mxw-smt: Data translated by Statistical Machine Translation (SMT) us-assign: Reassignment data from the USPTO inpadoc-ls.: Legal status events from the EPO Inpadoc service ipcr and mcf: Reclassification files from EPO and USPTO, respectively
status	Internal attribute used in update procedures
format	Designates the normalized or not-normalized format of the following document-id. "epo" is the standardized DOCDB format "original" is the unparsed format directly from the data source Rule: "original" format is only provided if "epo" format is not available

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