96 September 2005 XMP Specification Embedding XMP Metadata in Application Files GIF 5 Data, a length byte is read. If it is non-zero, that many bytes of data are read, followed by the next length byte. The series ends when a zero length byte is encountered. When XMP is encoded as UTF-8, there are no zero bytes in the XMP Packet. Therefore, software that is unaware of XMP views packet data bytes as sub-block lengths, and follows them through the packet accordingly, eventually arriving somewhere in the magic trailer. The trailer is arranged so whichever byte is encountered there will cause a skip to the Block Terminator at the end. Reference The GIF 89a specification is available at http://members.aol.com/royalef/gif89a.txt
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