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Various services require the ability to return a collection of track identifiers. This is achieved using an IdArray.

An IdArray represents an array of big endian 32-bit unsigned integers. For example,

0x00 0x00 0x00 0x02 0x00 0x00 0x01 0x03 0x00 0x00 0x00 0x13

represents 3 tracks with the id's 2, 259, and 19 in that order.

Since UPnP has no native collection types, an IdArray has binary type in UPnP services.