Re: defaulting units for measurements

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From: Richard Knapp (gyp_caver_at_yahoo.com)
Date: Tue Feb 13 2001 - 13:27:05 CET 

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From: "Richard Knapp" <gyp_caver_at_yahoo.com>
To: "cavexml_at_cartography.ch" <cavexml_at_cartography.ch>
Date: Tue, 13 Feb 2001 07:27:05 -0500 (EST)
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Subject: Re: defaulting units for measurements
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>>>> Sounding a little like keys into a table in a database, very good conclusion. A stations's
>>>> key would only exist for that particular version of a CaveXML file. Changing the data
>>>> after reading it and then re-writing it would of course generate a new and probably
>>>> different set of station keys.

>> Would it be better to generate keys for each station or each survey? I'm thinking
>> specifically of the way Survex handles data. If the key to each station was changed
>> each time the data was saved, would this change the way the links between surveys
>> would have to be handled?

>There is a single station id, which all aliased or equated stations are replaced with.
>This is done in the background, the shot with the aliased or equated station would be an
>index to a third table, containing all equated stations and their lookup to the master
>station ids.

So something similar to:

<survey>
        <shot>
                <from IDREF="000000001"/>
                <to IDREF="00000000A"/>
        </shot>
        <shot>
                <from IDREF="00000000A"/>
                <to IDREF="00000000B"/>
        </shot>
</survey>
<station_index>
        <station ID="000000001" name="A1"/>
        <station ID="00000000A" name="B1"/>
        <station ID="00000000B" name="B2"/>
</station_index>

or something like that?

Is that correct? If so, wouldn't I be pretty much required to use a special program to handle that?
Or could I just use any XML editor? How much can be specified in the DTD/Schema to make this
work?

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