Hi, appreciate the work very much.
My Python skills are a bit rusty but I can't seem to find a way to add multiple “AND” and “OR” filters dynamically!

My objective is to translate a parsed query string (SQL) to the corresponding SLD syntax. For example: "a > 1 and b < 2".
As far as I can tell, I must first create two separate filters for the rule:
import sld

...

r = fs.create_rule('r1')
f1 = sld.Filter(r)
f1.a = sld.PropertyCriterion(f1, 'PropertyIsGreaterThan')
f1.a.PropertyName = 'a'
f1.a.Literal = '1'
f2 = sld.Filter(r)
f2.b = sld.PropertyCriterion(f2, 'PropertyIsLessThan')
f2.b.PropertyName = 'b'
f2.b.Literal = '2'
and finally combine them like so:
r.Filter = f1 + f2

Now, how can I accomplish this when the number of criterion and operands are unknown? Essentially, I need to execute the Filter assignment dynamically but the filter references (f1 and f2) must already be defined!
Consider the following example: "(a > 1 and b < 2 and c = 3 ) or (d = 4 and e >= 5)"

Did I miss something? Thanks

Roland Hansson

David, finally got around to trying python-sld and I can't get past this. I'm sure I'm doing something stupid.
from python shell:

import sld
mysld = StyledLayerDescriptor()

this returns error above.

did sudo easy_install --upgrade python-sld beforehand

thanks,
Michael

When I go to print my sld out my filter ends up below my symbolizer. Is there any way to avoid since this violates sld styling policies? Here is my code.

mysld = sld.StyledLayerDescriptor()
nl = mysld.create_namedlayer('test')
ustyle = nl.create_userstyle()
fts = ustyle.create_featuretypestyle()
firstRule = fts.create_rule('test',sld.PolygonSymbolizer)
firstRule.create_filter('value', '>', 'T')
print mysld.as_sld(pretty_print=True)

Is it possible to create more than one rule in an Layer or FutureTypeStyle, by using a list or similar?
I'm running sld in a loop to create an sld file similar to the one generated by QGIS, but the final result only includes the last data from the loop. Thanks

any plan to support RasterSymbolizer?

I am running this script:

from sld import *
sld_doc = StyledLayerDescriptor() 

# Create Layer
nl = sld_doc.create_namedlayer('Drivetime Polygon Style ')
us = nl.create_userstyle()
us.Title = 'Drivetime'


# Create Rule
fts = us.create_featuretypestyle()
r1 = fts.create_rule('Interval 1', PolygonSymbolizer)

# Create Filter
f1 = Filter(r1)
f1.PropertyIsEqualTo = PropertyCriterion(f1, 'PropertyIsEqualTo')
f1.PropertyIsEqualTo.PropertyName = 'drivetime' 
f1.PropertyIsEqualTo.Literal = 'v1'

r1.Filter = f1

content = sld_doc.as_sld(pretty_print=True)
print content

And it creates this sld file:

<sld:StyledLayerDescriptor xmlns:sld="http://www.opengis.net/sld" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ogc="http://www.opengis.net/ogc" version="1.0.0">
  <sld:NamedLayer>
    <sld:Name>Drivetime Polygon Style </sld:Name>
    <sld:UserStyle>
      <sld:Title>Drivetime</sld:Title>
      <sld:FeatureTypeStyle>
        <sld:Rule>
          <sld:Title>Interval 1</sld:Title>
          <sld:PolygonSymbolizer>
            <sld:Fill>
              <sld:CssParameter name="fill">#AAAAAA</sld:CssParameter>
            </sld:Fill>
            <sld:Stroke>
              <sld:CssParameter name="stroke">#000000</sld:CssParameter>
              <sld:CssParameter name="stroke-width">1</sld:CssParameter>
            </sld:Stroke>
          </sld:PolygonSymbolizer>
          <ogc:Filter>
            <ogc:PropertyIsEqualTo>
              <ogc:PropertyName>drivetime</ogc:PropertyName>
              <ogc:Literal>v1</ogc:Literal>
            </ogc:PropertyIsEqualTo>
          </ogc:Filter>
        </sld:Rule>
      </sld:FeatureTypeStyle>
    </sld:UserStyle>
  </sld:NamedLayer>
</sld:StyledLayerDescriptor>

The file is not valid, because the PolygonSymbolizer is before the filter. Is this a bug or am I doing something wrong?

I have a project where I need to load multiple layers. To speed up this process, I'm launching multiple processes to retrieve the layer images. If there are multiple layers that have SLD's associated with them, they can break sometimes when there is contention over the schema document created within the init method of StyledLayerDescriptor. Is there a known workaround for this situation?

I'm looking at modifying the code locally to just keep the schema file around at all times to prevent this contention, but wanted to see if there were other ways of dealing with it.

Thanks much.

Hi David,
I would like use your library, but I don't see how add ExternalGraphic node instead as mark.

The best way to do this is creating a custom PointSymbolizer class that uses a custom graphic class, not?

The Rule.create_filter is looking for == when doing a PropertyIsEqualTo comparitor. However, the documentation states that = is acceptable.

This had me looking around for a while. :(

Are there any workaround available for accessing this rule property with "UpperBoundary" and "LowerBoundary" Value?

I would like create and sld style with multiple NamedLayer
This my code

doc = sld.StyledLayerDescriptor()

llista = MapStyle.objects.filter(map=id).order_by('order')
for mapstyle in llista:
nl = doc.create_namedlayer(mapstyle.style.name)

I created a namelayer for each element in llista but the result only includes the last NamedLayer.

I possible do this?

I try to do removing the namedlayer node and inserting after the namedlayer nodes but without success

doc = sld.StyledLayerDescriptor()

llista = MapStyle.objects.filter(map=2).order_by('order')
namedlayers=[]
for mapstyle in llista:
    namedlayers.append( doc.create_namedlayer(mapstyle.style.name)._node )

nl_node = doc._node.xpath('sld:NamedLayer', namespaces=sld.SLDNode._nsmap)[0]
doc._node.remove(nl_node)

i=0
for n in namedlayers:
    doc._node.insert(i, namedlayers[i])
    i=i+1

print etree.tostring(doc._node, with_tail=False, pretty_print=True)

Consider using Sphinx (http://sphinx-doc.org/) for Documetnation purposes?