Change "DataSource#location" to "DataSource#uri" and support data sources based on environment variables
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/transformation/Transformation.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/transformation/Transformation.java
deleted file mode 100644
index d1bd2e2..0000000
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/transformation/Transformation.java
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.freemarker.generator.base.transformation;
-
-import org.apache.freemarker.generator.base.datasource.DataSource;
-import org.apache.freemarker.generator.base.template.TemplateSource;
-
-import java.io.Writer;
-import java.util.List;
-
-/**
- *
- */
-public class Transformation {
-
-    private final TemplateSource templateSource;
-
-    private final List<DataSource> dataSources;
-
-    private final Writer writer;
-
-    public Transformation(TemplateSource templateSource, List<DataSource> dataSources, Writer writer) {
-        this.templateSource = templateSource;
-        this.dataSources = dataSources;
-        this.writer = writer;
-    }
-}