Variable substitution refers to those parameters that can have part of their
value changed remotely. The supported
parameters are:
LAYER: data, tileindex, connection and filter
CLASS: expression
Setting up parameter validation is STRONGLY encouraged. In your layer metadata
you'd define keys based on variable
names to do validation. For example, if your variable was called 'foo' and you
wanted to allow a single digit integer from
1 to 9 as a value you'd do:
METADATA
...
'foo_validation_pattern' '^[1-9]$'
...
END
The value of 'foo' would have to pass the supplied regex before the parameter
would be altered. It is up to you to author
the correct validation pattern.
MapServer also supports some URL-based configuration. This is different than
substitution in that you are completely
changing values of object parameters or even creating new objects. That is, you
can change a class color or create
a new point feature. Support here (at the moment) is limited to parameters that
are validated as part of mapfile parsing.
For example, MapServer checks to make sure a color is of the correct format,
that a double is a double and so on. The
only two exceptions are layer DATA and TEMPLATE properties and they are
required to validate against DATAPATTERN or
TEMPLATEPATTERN before being used.
This is all going to be generalized and improved in 5.4.
Steve
>>> On 9/9/2008 at 2:42 PM, in message
<[EMAIL PROTECTED]>, "John Mitchell"
<[EMAIL PROTECTED]> wrote:
> Hi,
>
> What is the difference between Run-time Substitution vs. Variable
> Substitution within a map file?
> They look like they are the same thing.
>
> Also what are the Parameters Supported?
>
>>From documentation that is almost 3 years old it lists the following
> parametes (listed below) is this list complete?
>
>
> - LAYER: DATA (must validate against DATAPATTERN)
> - LAYER: TILEINDEX
> - LAYER: CONNECTION
> - LAYER: FILTER
> - CLASS EXPRESSION
>
>
> Thanks,
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