Knowledge: Customs Declarations end-to-end service guide #1391
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For imports and exports, the submitter of the declaration interacts with CDS to manage events such as the declaration submission. CDS expects to receive declaration data within the WCO format, defined by the schema and the HMRC Customs Tariff. The schema keeps most elements as optional to allow for capturing a complete declaration, or just partial (e.g. to support simplified import declarations). The goods arrival message is submitted to instruct CDS that goods are available for inspection following the submission of a pre-lodged declaration.