XML question, DOM or SAX?

Markus von Ehr markus.vonehr at ipm.fhg.de
Fri Oct 18 17:37:58 CEST 2002


Hi Gustavo,

no, I don't have rgb values, inside one spec I have about 1000
values representing spectral lines.
I don't want to enclose every value inside something like
<red>
</red>
the efficiency would be very bad...

Markus


sismex01 at hebmex.com schrieb:
> 
> > From: Markus von Ehr [mailto:markus.vonehr at ipm.fhg.de]
> >
> > Hi,
> >
> > 1.
> > I want to save one or more spectras in a XML file.
> > The program shall be able to read this file into my own
> > data object structure, too.
> > The data can be displayed or altered.
> > After all the data has to be saved again to XML.
> >
> > Shall I use SAX or DOM?
> >
> > 2.
> > One file can contain one or more spectra.
> > Can the structure be like that?
> > <spec>
> >  0.1
> >  0.2
> >  0.14
> > </spec>
> > <spec>
> >  0.2
> >  0.3
> >  0.11
> > </spec>
> > <spec>
> >  0.14
> >  0.17
> >  0.12
> > </spec>
> >
> > or is it impossible to enclose all values from one spectra within
> > the <spec> quotation?
> >
> > Thanks for any hints,
> >
> > Markus
> >
> 
> I suppose that the number triad is r,g,b values; but without any
> markup it's impossible to know.
> 
> One you've read a spec, you'd have to split on whitespace, and
> then convert to numbers; your application, internally, has to know
> in what order the values are (rgb, ycm, hsv, etc), else it can't
> tell them apart.
> 
> I'd rather use something a bit more verbose, but impossible to
> confuse or musunderstand; either encode in attributes:
> 
>     <spec red="0.1" green="0.2" blue="0.14" />
>     <spec red="0.2" green="0.3" blue="0.11" />
>     <spec red="0.14" green="0.17" blue="0.12" />
> 
> or, encode in nested tags:
> 
>     <spec>
>       <red>0.1</red>
>       <green>0.2</green>
>       <blue>0.14</blue>
>     </spec>
>     <spec>
>       <red>0.2</red>
>       <green>0.3</green>
>       <blue>0.11</blue>
>     </spec>
>     <spec>
>       <red>0.14</red>
>       <green>0.17</green>
>       <blue>0.12</blue>
>     </spec>
> 
> You can also add an "encoding" tag, to indicate which
> tags can be found inside:
> 
>     <spec encoding="rgb"> .... </spec>
>     <spec encoding="cmyk"> .... </spec>
> 
> etc.
> 
> Anyway, that's just my opinion; hope this helps.
> 
> good luck :-)
> 
> -gustavo



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