diff -r 9ca02f0f6751 -r a72d55ff30c9 java/alt2xml-out-xpath/src/cz/frantovo/alt2xml/out/xpath/XPathAction.java
--- a/java/alt2xml-out-xpath/src/cz/frantovo/alt2xml/out/xpath/XPathAction.java	Sun Sep 07 00:26:38 2014 +0200
+++ b/java/alt2xml-out-xpath/src/cz/frantovo/alt2xml/out/xpath/XPathAction.java	Sun Sep 07 01:28:07 2014 +0200
@@ -30,6 +30,7 @@
 import javax.xml.xpath.XPathExpression;
 import javax.xml.xpath.XPathExpressionException;
 import javax.xml.xpath.XPathFactory;
+import javax.xml.xpath.XPathVariableResolver;
 
 /**
  *
@@ -39,8 +40,10 @@
 
 	public static final String PARAMETER_TYPED_PARAMETERS = "typed-parameters";
 	public static final String PARAMETER_LINE_BREAK = "line-break";
+	public static final String PARAMETER_ENVIRONMENT_VARIABLES = "environment-variables";
 	private final boolean typedParameters;
 	private final boolean lineBreak;
+	private final boolean environmentVariables;
 	private final XPathFactory xpathFactory;
 	private final XPath xpath;
 	private final String expressionString;
@@ -59,6 +62,7 @@
 
 			typedParameters = Boolean.parseBoolean(actionContext.getActionProperties().getProperty(PARAMETER_TYPED_PARAMETERS));
 			lineBreak = Boolean.parseBoolean(actionContext.getActionProperties().getProperty(PARAMETER_LINE_BREAK, Boolean.TRUE.toString()));
+			environmentVariables = Boolean.parseBoolean(actionContext.getActionProperties().getProperty(PARAMETER_ENVIRONMENT_VARIABLES, Boolean.FALSE.toString()));
 
 			Map<String, Object> xpathParameters = new HashMap<>();
 
@@ -69,7 +73,10 @@
 				xpathParameters.put(parameterName, parameterValue);
 			}
 
-			xpath.setXPathVariableResolver(new PropertiesVariableResolver(xpathParameters));
+			XPathVariableResolver cliVariableResolver = new PropertiesVariableResolver(xpathParameters);
+			XPathVariableResolver variableResolver = environmentVariables ? new CompoundVariableResolver(cliVariableResolver, new EnvironmentVariableResolver()) : cliVariableResolver;
+
+			xpath.setXPathVariableResolver(variableResolver);
 
 			expressionString = actionData.get(0);
 			try {