Question about GFS files

[Tim Manners]

I have been looking into the use of ogr2ogr to load some GML data into a
PostgreSQL database.

I understand that I can edit the GFS files which are created in order to
change how the GML elements are handled (e.g. changing the output width
for a text string).

What I am interested in knowing is how to handle nested elements in the
GML (which currently seem to be ignored).

For example:
The following section of GML defines how a piece of text is rendered in
terms of the anchorPosition, font, height and orientation...

<osgb:textRendering>
<osgb:anchorPosition>3</osgb:anchorPosition>
<osgb:font>1</osgb:font>
<osgb:height>3.000</osgb:height>
<osgb:orientation>0</osgb:orientation>
</osgb:textRendering>

Is it possible to handle a nested element in the <ElementPath> tag of
the GFS file? If so - how is it done?

Additionally, is it possible to bring mathematical functions into the
GFS file? The reason that I ask is because the orientation element is
stored in tenths of a degree - meaning it needs to be divided by 10 to
get the true orientation angle (and it would be good to perform this
function on the data load - as opposed to subsequently in PostgreSQL).

Many thanks in advance.

Tim

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[Frank Warmerdam-2]

Tim Manners wrote:

> For example:
> The following section of GML defines how a piece of text is rendered in
> terms of the anchorPosition, font, height and orientation...
>
> <osgb:textRendering>
> <osgb:anchorPosition>3</osgb:anchorPosition>
> <osgb:font>1</osgb:font>
> <osgb:height>3.000</osgb:height>
> <osgb:orientation>0</osgb:orientation>
> </osgb:textRendering>
>
> Is it possible to handle a nested element in the <ElementPath> tag of
> the GFS file? If so - how is it done?

Tim,

I think you would specify the path to the element (relative to the
feature) in the ElementPath element in the GFS file.

     <PropertyDefn>
       <Name>font</Name>
       <ElementPath>osgb:textRendering.osgb:font</ElementPath>
       <Type>String</Type>
     </PropertyDefn>

It is possible that the parser has already stripped off namespaces
at the point these are processed in which case you would need to
do it without the osgb: prefixes.

> Additionally, is it possible to bring mathematical functions into the
> GFS file? The reason that I ask is because the orientation element is
> stored in tenths of a degree - meaning it needs to be divided by 10 to
> get the true orientation angle (and it would be good to perform this
> function on the data load - as opposed to subsequently in PostgreSQL).

No, this is not supported in a .gfs file.  At this point I would normally
consider writing a load script to perform feature transformations during
loading.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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