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It allows arbitrary structured data of different types to be assembled in one file for exchanging between arbitrary computers. The maximal length of a datum composite as well as elementary encoded using SDXF is bytes one less than 16 MiB. SDXF data can express arbitrary levels of structural depth. Data elements are self-documenting , meaning that the metadata numeric, character string or structure are encoded into the data elements.
The design of this format is simple and transparent: The word "exchange" in the name reflects another kind of transparency: Serializations can be exchanged among computers via direct network, file transfer or CD without further measures. The SDXF functions on the receiving side handle architectural adaptation. Structured data is data with patterns predictable more complex than strings of text.
The invoices have the following hierarchical nested structure:. The basic element is a chunk. An SDXF serialization is itself a chunk. A chunk can consist of a set of smaller chunks. Chunks are composed of a header prefix of six bytes, followed by data. It may contain additional information about compression, encryption and more. The chunk type indicates whether the data consists of text a string of characters , a binary number integer or floating point or if the chunk a composite of other chunks.
For a precise description see page 2 of the RFC or alternatively here. There are only few of them:. SDXF is not designed for readability or to be modified by text editors. A related editable structure is SDEF. From Wikipedia, the free encyclopedia. To read Chunks, following functions has to be used: This structure is already current. To build Chunks, following functions has to be used: Chunk inside this substructure This need not be how the name arose, however.