[dsdl-comment] Re: FAQ: (1) NVDL versus XProc, (2) Performance of NVDL

Costello, Roger L. wrote:

> 2. Another comment that I heard is:
>
> "The NVDL processor (dispatcher) adds an additional layer and thus
> introduces a performance penalty.

Or, in same cases, it can increase performance. Without NVDL you have to
  create one huge "überschema" -- if you combine for example XHTML +
MathML + SVG + SMIL you get schema with hundreds, might be thousands of
elements. Majority of validators are not designed to efficiently handle
such large schemas.

Anyway performance penalty of NVDL dispatching will be fractional when
compared to validation itself.

Without adding layers we would be still programming by typing machine
code by hand. ;-)

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