GXT 4 permutations, setting specific build properties.

Explorer.gwt.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.7.0//EN"
  "http://gwtproject.org/doctype/2.7.0/gwt-module.dtd">
<module rename-to='explorer'>
  <inherits name='com.google.gwt.activity.Activity' />
  <inherits name='com.google.gwt.place.Place' />
  <inherits name="com.google.gwt.inject.Inject" />

  <inherits name='com.sencha.gxt.examples.resources.Resources' />
  <inherits name='com.sencha.gxt.chart.Chart' />
  
  <!-- Testing -->
  <inherits name="com.google.gwt.user.Debug"/>
  <inherits name="org.senchalabs.gwt.gwtdriver.gxt.TestableGXT" />

  <!-- https://docs.sencha.com/gxt/4.x/guides/concepts/Logging.html -->
  <set-property name="gwt.logging.logLevel" value="SEVERE" />
  <set-property name="gwt.logging.enabled" value="TRUE" />
  <set-property name="gxt.logging.enabled" value="false" />

  <!-- Include all base GXT themes and set the app to check for url params to activate a different one -->
  <inherits name="com.sencha.gxt.theme.blue.Blue" />
  <inherits name="com.sencha.gxt.theme.gray.Gray" />
  <inherits name="com.sencha.gxt.theme.neptune.Theme" />
  <inherits name="com.sencha.gxt.theme.triton.Theme" />
  <set-property name="gxt.theme" value="blue,gray,neptune,triton" />
  <property-provider name="gxt.theme"><![CDATA[
    if (window.location.pathname.indexOf('blue') != -1 || window.location.search.indexOf('blue') != -1) {
      return "blue";
    }
    if (window.location.pathname.indexOf('gray') != -1 || window.location.search.indexOf('gray') != -1) {
      return "gray";
    }
    if (window.location.pathname.indexOf('neptune') != -1 || window.location.search.indexOf('neptune') != -1) {
      return "neptune";
    }
    return "triton";
  ]]></property-provider>

  <set-property name="gxt.css3.enabled" value="false">
    <any>
      <when-property-is name="gxt.theme" value="blue" />
      <when-property-is name="gxt.theme" value="gray" />
    </any>
  </set-property>

  <set-configuration-property name="CssResource.enableGss" value="true" />
  <set-configuration-property name="CssResource.style" value="pretty" />

  <replace-with class='com.sencha.gxt.explorer.client.chart.BlueThemedChartAppearance'>
    <when-type-is class='com.sencha.gxt.explorer.client.chart.ThemedChartExample.ThemedChartAppearance'/>
    <when-property-is name="gxt.theme" value="blue" />
  </replace-with>
  <replace-with class='com.sencha.gxt.explorer.client.chart.GrayThemedChartAppearance'>
    <when-type-is class='com.sencha.gxt.explorer.client.chart.ThemedChartExample.ThemedChartAppearance'/>
    <when-property-is name="gxt.theme" value="gray" />
  </replace-with>
  <replace-with class='com.sencha.gxt.explorer.client.chart.NeptuneThemedChartAppearance'>
    <when-type-is class='com.sencha.gxt.explorer.client.chart.ThemedChartExample.ThemedChartAppearance'/>
    <when-property-is name="gxt.theme" value="neptune" />
  </replace-with>
  <replace-with class='com.sencha.gxt.explorer.client.chart.TritonThemedChartAppearance'>
    <when-type-is class='com.sencha.gxt.explorer.client.chart.ThemedChartExample.ThemedChartAppearance'/>
    <when-property-is name="gxt.theme" value="triton" />
  </replace-with>

  <!-- Specify the paths for translatable code -->
  <source path='client' />
  <source path='shared' />

  <generate-with class="com.sencha.gxt.explorer.rebind.SampleGenerator">
    <when-type-assignable class="com.sencha.gxt.explorer.client.model.ExampleModel" />
  </generate-with>

  <set-configuration-property name="GXT.state.autoBeanFactory" value="com.sencha.gxt.explorer.client.window.WindowStateExample.ExampleAutoBeanFactory" />

  <entry-point class='com.sencha.gxt.explorer.client.Explorer' />

  <stylesheet src="reset.css"/>

  <!-- collapse properties for fewer permutations -->
  <collapse-property name="gxt.device" values="phone, tablet" />
  <collapse-property name="gxt.theme" values="blue, gray" />
  <collapse-property name="gxt.user.agent" values="air, safari*, chrome*, gecko*, ie11" />
  <collapse-property name="user.agent" values="safari*, gecko*" />
  <collapse-property name="gxt.user.agent" values="ie8, ie9, ie10" />
  <collapse-property name="user.agent" values="ie*" />
  
  <!-- The property below is replaced from maven profile mvn install -Pfast-build -->
  <!--{profile.fast.build}-->
</module>

pom.xml

 <profile>
      <id>fast-build</id>
      <properties>
        <profile.fast.build>
          &lt;set-property name="user.agent" value="safari" /&gt;
          &lt;set-property name="gxt.user.agent" value="chrome" /&gt;
          &lt;set-property name="gxt.device" value="desktop" /&gt;
          &lt;set-property name="gxt.theme" value="triton" /&gt;
        </profile.fast.build>
      </properties>
      <build>
        <resources>
          <resource>
            <directory>src/main/java</directory>
            <filtering>true</filtering>
            <includes>
              <include>**/*.gwt.xml</include>
            </includes>
          </resource>
        </resources>
        
        <plugins>
                <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-resources-plugin</artifactId>
        <version>3.0.2</version>
        <configuration>
          <encoding>UTF-8</encoding>
          <delimiters>&lt;!--{*}--&gt;</delimiters>
        </configuration>
      </plugin>
        </plugins>
      </build>
    </profile>