SLD dynamic fill

Simple example of dynamic sld style. But it is not a trully dynamic style, it is just a tricky Fill.
Based on Categorize function and CQL filter. At first i choose property, what i want to base to, and default value(literally this is a maximum property value).
After based on this value create intervals for coloured features in different colours - 1200-*, 900-1200, 700-900 etc. Now divide interval’s low borders on max value i got a coefficient what compares in Categorize function.

A style:

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<se:FeatureTypeStyle>
<se:Rule>
  <se:Name> >1201 </se:Name>
  <se:Description>
	<se:Title> >1201 </se:Title>
  </se:Description>
  <se:PolygonSymbolizer>
	   <se:Fill>
		 <se:SvgParameter name="fill">
		   <ogc:Function name="Categorize">
			 <!-- Value to transform -->
			 <ogc:Div>
			   <ogc:Function name="env">
					<ogc:Literal>high</ogc:Literal>
					<ogc:Literal>1200</ogc:Literal>
				</ogc:Function>
				<ogc:PropertyName>count</ogc:PropertyName>
			 </ogc:Div>
			 
			 <!--1200-*-->
			 <ogc:Literal>#ff0000</ogc:Literal> 
			 <ogc:Literal>1</ogc:Literal>
			  <!--900-1200-->
			 <ogc:Literal>#8b3058</ogc:Literal>
			 <ogc:Literal>1.33</ogc:Literal>
			 <!--700-900-->					 
			 <ogc:Literal>#ad466c</ogc:Literal>
			 <ogc:Literal>1.71</ogc:Literal>
			 <!--500-700-->
			 <ogc:Literal>#cc607d</ogc:Literal>
			 <ogc:Literal>2.4</ogc:Literal>
			 <!--300-500-->
			 <ogc:Literal>#3b3434</ogc:Literal>
			 <ogc:Literal>3.99</ogc:Literal>
			 <!--100-300-->
			 <ogc:Literal>#f4a3a8</ogc:Literal>
			 <ogc:Literal>11.89</ogc:Literal>
			 <!--*-100-->
			 <ogc:Literal>#0000ff</ogc:Literal>
			 
		   </ogc:Function>
		 </se:SvgParameter>
	   </se:Fill>
	   <se:Stroke>
		  <se:SvgParameter name="stroke">#3b3434</se:SvgParameter>
		  <se:SvgParameter name="stroke-opacity">0.5</se:SvgParameter>
		  <se:SvgParameter name="stroke-width">1</se:SvgParameter>
		  <se:SvgParameter name="stroke-linejoin">mitre</se:SvgParameter>
		</se:Stroke>
	</se:PolygonSymbolizer>
</se:Rule> 
</se:FeatureTypeStyle>

With default value layer looks:

Default style

Now add CQL filter:

&env=high:900&CQL_FILTER=count<%3D900

It’s mean that features with count property less that 900 will shows on map. And Categorize function will use high=900. So result:

900

&env=high:100&CQL_FILTER=count<%3D100

100

Ofcouse this style will works with only syntetic data.