On 09/23/2012 06:28 PM, Curtis Olson wrote:
> I have a question about the Flightgear xml config system and doing
> "includes". This is an arbitrary example, but let's say I have an xml
> config file called "main.xml":
>
> <PropertyList>
> <config>
> <weight-and-balance include="passengers.xml" />
> </config>
> </PropertyList>
>
> The passenger.xml file might look like the following:
>
> <PropertyList>
> <passenger1-kg>60</passenger1-kg>
> <passenger2-kg>60</passenger2-kg>
> <passenger2-kg>60</passenger2-kg>
> <passenger2-kg>60</passenger2-kg>
> </PropertyList>
>
> In the property tree after this loads I will have:
>
> /config/weight-and-balance/passenger1-kg = 60
> /config/weight-and-balance/passenger2-kg = 60
> /config/weight-and-balance/passenger3-kg = 60
> /config/weight-and-balance/passenger4-kg = 60
>
> Now this is an arbitrary example, but what I want to do in my main.xml
> is override some of the default values in passenger.xml. Just imagine I
> am including a much more complicated config file with a lot of standard
> values, but maybe I want to override a tcp port, or set a enable/disable
> flag and do that from the main.xml level, and not touch the included
> file. This included file may get included on a number of systems and I
> may want to set specific values for each installation, rather than
> create a myriad of slightly different copies of a bunch of different
> included files.
As far as I know XML is processed in order of appearance, so this should
do the trick:
<PropertyList>
<config>
<weight-and-balance include="passengers.xml">
<passenger1-kg>75</passenger1-kg>
<passenger3-kg>80</passenger1-kg>
</weight-and-balance>
</config>
</PropertyList>
Erik
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