Re: [Flightgear-devel] props.html
Jon Berndt wrote: Would you say that the JSBSim property tree is "grafted" onto the FlightGear tree? Yes, that sounds like a good description of the situation. Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] props.html
May be it is time we update the Source/docs-mini/README.properties to include Erik's description. Regards, Ampere On July 3, 2004 10:28 am, Vivian Meazza wrote: > It is :-). There is also a short, and not very useful, discourse on XML > available, but I think Eric's description is about as good as it gets. > > V. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] props.html
> The property system is best described as an in-memory LDAP database > which holds the state of global variables. The system has a tree like > hierarchy (like a file system) and has a root node, sub nodes (like > subdirectories) and end-nodes (variables). > > All variables are kept internally as raw values and can be converted to > any other supported type (boolean, int, float double and string). > > Like a file system, every node can be accessed relative to the current > node, or absolute to the root node. > > The property system also allows aliasing nodes to other nodes (like > symbolic linking files or directories to other files or directories) and > may be assigned read-only or read-write. > > If necessary it would be possible for parts of the program to hold it's > own property tree, which is inaccessible from the global property tree, > by keeping track of it's own root-node. > > Property I/O code allows one to easily read the tree from, or write the > tree to an XML file. Would you say that the JSBSim property tree is "grafted" onto the FlightGear tree? Jon ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] props.html
Jon Berndt wrote > Sent: 03 July 2004 15:12 > To: FlightGear developers discussions > Subject: RE: [Flightgear-devel] props.html > > > That just appears to be a list of properties. > > > -Original Message- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] Behalf Of Vivian > > Meazza > > Sent: Saturday, July 03, 2004 9:00 AM > > To: 'FlightGear developers discussions' > > Subject: RE: [Flightgear-devel] props.html > > > > > > > > > > Vivian Meazza wrote > > > > > > > Sent: 03 July 2004 14:52 > > > To: 'FlightGear developers discussions' > > > Subject: RE: [Flightgear-devel] props.html > > > > > > > > > > > > > > > Jon Berndt wrote > > > > > > > Can anyone tell me if/where the props.html file is that > describes > > > > the property system? I can't seem to find it in the > source tree or > > > > on the web sites - but it IS in simgear CVS. > > > > > > > > > It used to be around - I have a print-out of it! What bit do > > > you want? I > > > could scan it in. > > > > > > > Is this what you were after? > > > > Source/docs-mini/README.properties > > > > V. > > It is :-). There is also a short, and not very useful, discourse on XML available, but I think Eric's description is about as good as it gets. V. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] props.html
That just appears to be a list of properties. > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Vivian > Meazza > Sent: Saturday, July 03, 2004 9:00 AM > To: 'FlightGear developers discussions' > Subject: RE: [Flightgear-devel] props.html > > > > > Vivian Meazza wrote > > > > Sent: 03 July 2004 14:52 > > To: 'FlightGear developers discussions' > > Subject: RE: [Flightgear-devel] props.html > > > > > > > > > > Jon Berndt wrote > > > > > Can anyone tell me if/where the props.html file is that > > > describes the property system? I can't seem to find it in the > > > source tree or on the web sites - but it IS in simgear CVS. > > > > > > It used to be around - I have a print-out of it! What bit do > > you want? I > > could scan it in. > > > > Is this what you were after? > > Source/docs-mini/README.properties > > V. > > > > ___ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] props.html
> The property system is best described as an in-memory LDAP database > which holds the state of global variables. The system has a tree like > hierarchy (like a file system) and has a root node, sub nodes (like > subdirectories) and end-nodes (variables). > > All variables are kept internally as raw values and can be converted to > any other supported type (boolean, int, float double and string). > > Like a file system, every node can be accessed relative to the current > node, or absolute to the root node. > > The property system also allows aliasing nodes to other nodes (like > symbolic linking files or directories to other files or directories) and > may be assigned read-only or read-write. > > If necessary it would be possible for parts of the program to hold it's > own property tree, which is inaccessible from the global property tree, > by keeping track of it's own root-node. This is pretty good - I may incorporate some of this in the paper. > Property I/O code allows one to easily read the tree from, or write the > tree to an XML file. After reading this, I suspect that we (JSBSim) could be using the property system inherent features more advantageously. This will all come when we incorporate a better XML parser, I expect. Jon ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] props.html
Vivian Meazza wrote > Sent: 03 July 2004 14:52 > To: 'FlightGear developers discussions' > Subject: RE: [Flightgear-devel] props.html > > > > > Jon Berndt wrote > > > Can anyone tell me if/where the props.html file is that > > describes the property system? I can't seem to find it in the > > source tree or on the web sites - but it IS in simgear CVS. > > > It used to be around - I have a print-out of it! What bit do > you want? I > could scan it in. > Is this what you were after? Source/docs-mini/README.properties V. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] props.html
Jon Berndt wrote: Can anyone tell me if/where the props.html file is that describes the property system? I can't seem to find it in the source tree or on the web sites - but it IS in simgear CVS. There doesn't seem to be a file called props.html, and as far as I can remember there hasn't been any. The property system is best described as an in-memory LDAP database which holds the state of global variables. The system has a tree like hierarchy (like a file system) and has a root node, sub nodes (like subdirectories) and end-nodes (variables). All variables are kept internally as raw values and can be converted to any other supported type (boolean, int, float double and string). Like a file system, every node can be accessed relative to the current node, or absolute to the root node. The property system also allows aliasing nodes to other nodes (like symbolic linking files or directories to other files or directories) and may be assigned read-only or read-write. If necessary it would be possible for parts of the program to hold it's own property tree, which is inaccessible from the global property tree, by keeping track of it's own root-node. Property I/O code allows one to easily read the tree from, or write the tree to an XML file. HTH Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] props.html
> Jon Berndt wrote > > > Can anyone tell me if/where the props.html file is that > > describes the property system? I can't seem to find it in the > > source tree or on the web sites - but it IS in simgear CVS. > > > It used to be around - I have a print-out of it! What bit do you want? I > could scan it in. > > Vivian I actually need to refer to it as a reference, but I don't see that it actually exists as a "live document" on any web site. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] props.html
Jon Berndt wrote > Can anyone tell me if/where the props.html file is that > describes the property system? I can't seem to find it in the > source tree or on the web sites - but it IS in simgear CVS. It used to be around - I have a print-out of it! What bit do you want? I could scan it in. Vivian ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] props.html
Can anyone tell me if/where the props.html file is that describes the property system? I can't seem to find it in the source tree or on the web sites - but it IS in simgear CVS. Jon ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
