This document uses the following terms:
Lempel-Ziv Extended (LZX): An LZ77-based compression engine, as described in [UASDC], that is a universal lossless data compression algorithm. It performs no analysis on the data.
Lempel-Ziv Extended Delta (LZXD): A derivative of the Lempel-Ziv Extended (LZX) format with some modifications to facilitate efficient delta compression. Delta compression is a technique in which one set of data can be compressed within the context of a reference set of data that is supplied both to the compressor and decompressor. Delta compression is commonly used to encode updates to similar existing data sets so that the size of compressed data can be significantly reduced relative to ordinary non-delta compression techniques. Expanding a delta-compressed set of data requires that the exact same reference data be provided during decompression.
MAY, SHOULD, MUST, SHOULD NOT, MUST NOT: These terms (in all caps) are used as defined in [RFC2119]. All statements of optional behavior use either MAY, SHOULD, or SHOULD NOT.