Computer Science – Information Theory
Scientific paper
2007-09-14
Computer Science
Information Theory
Scientific paper
The pressing need for eficient compression schemes for XML documents has recently been focused on stack computation [6, 9], and in particular calls for a formulation of information-lossless stack or pushdown compressors that allows a formal analysis of their performance and a more ambitious use of the stack in XML compression, where so far it is mainly connected to parsing mechanisms. In this paper we introduce the model of pushdown compressor, based on pushdown transducers that compute a single injective function while keeping the widest generality regarding stack computation. The celebrated Lempel-Ziv algorithm LZ78 [10] was introduced as a general purpose compression algorithm that outperforms finite-state compressors on all sequences. We compare the performance of the Lempel-Ziv algorithm with that of the pushdown compressors, or compression algorithms that can be implemented with a pushdown transducer. This comparison is made without any a priori assumption on the data's source and considering the asymptotic compression ratio for infinite sequences. We prove that Lempel-Ziv is incomparable with pushdown compressors.
Albert Pilar
Mayordomo Elvira
Moser Philippe
Perifel Sylvain
No associations
LandOfFree
Pushdown Compression does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pushdown Compression, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pushdown Compression will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-616914