Exi comparisions
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EXI Comparisions. EXI. Emerging W3C standard, now in “final call” status on the standards track http://www.w3.org/XML/EXI/ Provides a more efficient, alternate way to encode the XML infoset. • Relaxes XML requirement for text-only

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EXI Comparisions

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Exi comparisions

EXI Comparisions


Exi comparisions

EXI

  • Emerging W3C standard, now in “final call” status on the standards track

  • http://www.w3.org/XML/EXI/

  • Provides a more efficient, alternate way to encode the XML infoset.

  • • Relaxes XML requirement for text-only

  • • Can use schema information (if present) to encode XML document data more efficiently

  • • Can also work (less optimally) without a schema


Exi military

EXI & Military

  • This has big implications for the military

  • • We want XML for data interoperability

  • • But XML is too verbose to use on many military networks

  • • Poor string databinding characteristics push implementers to use custom binary protocols

  • • Which results in silos of exellence, and nobody able to use the anyone else’s data without a lot of custom programming


Exi comparisions

EXI

  • Measures of Effectiveness:

  • • Document size

  • • Databinding performance

  • The first is obvious: we want to use XML everywhere, but the documents can be too big. EXI can make documents smaller, while being exactly equivalent to the original XML

  • The second less so: we want to be able to efficiently get data from the document to a programming language, such as Java, C++, Python, etc.

  • The second is a hard problem to measure; all sorts of measures of effectiveness


Xml gzip

XML & Gzip

  • Why not just gzip XML?

  • • Doesn’t solve databinding issue at all

  • • For many XML documents with numeric data & a schema, EXI is more compact


Size comparison single dis pdu

Size Comparison: Single DIS PDU


Size comparison

Size Comparison

  • • The Gzipped data has the inherent problems of databinding string data

  • • The IEEE binary format is understood only by DIS-savvy applications

  • • The EXI schema-informed format is smaller than the original binary IEEE format, but at the cost of somewhat higher parsing complexity

  • • The schema-less EXI format is fairly competitive with gzip (results vary depending on the nature of the data)


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