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- chosen to minimize the chance that the same keyword is used for incompatible purposes by different applications.
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The constraints on the positioning of the individual chunks are listed in Table 7 and illustrated diagrammatically for static images in Figure 11 and Figure 12, for animated images where the static image forms the first frame in Figure 13 and Figure 14, and for animated images where the static image is not part of the animation in Figure 15 and Figure 16. These lattice diagrams represent the constraints on positioning imposed by this specification. The lines in the diagrams define partial ordering relationships. Chunks higher up shall appear before chunks lower down. Chunks which are horizontally aligned and appear between two other chunk types (higher and lower than the horizontally aligned chunks) may appear in any order between the two higher and lower chunk types to which they are connected. The superscript associated with the chunk type is defined in Table 8. It indicates whether the chunk is mandatory, optional, or may appear more than once. A vertical bar between two chunk types indicates alternatives.
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Table 7 Chunk ordering rules
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