[mapguide-users] Create new column in data source

[Jim O'Leary]

I would like my user to be able to add a new column to a SHP / SDF file at
run time. I have the code from the GT sample that shows how to create a new
MgDataPropertyDefinition:

$textProperty = new MgDataPropertyDefinition('Text');
$textProperty->SetDataType(MgPropertyType::String);
$textProperty->SetReadOnly(false);
$textProperty->SetLength(255);

However, this code goes on to create a new class and then a new feature
source. I already have those, but want only to add this new column. Any
suggestions?

Thanks.
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