diff --git a/src/TranslationSourceLocationContainer.php b/src/TranslationSourceLocationContainer.php
new file mode 100644
index 0000000..6d04d4f
--- /dev/null
+++ b/src/TranslationSourceLocationContainer.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the PHP Translation package.
+ *
+ * (c) PHP Translation team <tobias.nyholm@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Translation\Extractor;
+
+use Translation\Extractor\Model\SourceLocation;
+
+/**
+ * This interface is recognized by the extractors. Use this on your Form classes
+ * or anywhere where you have dynamic translation strings.
+ *
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+interface TranslationSourceLocationContainer
+{
+    /**
+     * Return an array of source locations.
+     *
+     * @return SourceLocation[]
+     */
+    public static function getTranslationSourceLocations();
+}
diff --git a/src/Visitor/Php/SourceLocationContainerExtractor.php b/src/Visitor/Php/SourceLocationContainerExtractor.php
new file mode 100644
index 0000000..2a5da2b
--- /dev/null
+++ b/src/Visitor/Php/SourceLocationContainerExtractor.php
@@ -0,0 +1,100 @@
+<?php
+
+/*
+ * This file is part of the PHP Translation package.
+ *
+ * (c) PHP Translation team <tobias.nyholm@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Translation\Extractor\Visitor\Php;
+
+use PhpParser\Node;
+use PhpParser\NodeVisitor;
+use Translation\Extractor\Model\SourceLocation;
+
+/**
+ * Extract translations from classes implementing
+ * Translation\Extractor\Model\SourceLocation\TranslationSourceLocationContainer.
+ *
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+class SourceLocationContainerExtractor extends BasePHPVisitor implements NodeVisitor
+{
+    /**
+     * @var string
+     */
+    private $namespace = '';
+
+    /**
+     * @var array
+     */
+    private $useStatements = [];
+
+    public function beforeTraverse(array $nodes)
+    {
+    }
+
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Node\Stmt\Namespace_) {
+            if (isset($node->name)) {
+                // Save namespace of this class for later.
+                $this->namespace = implode('\\', $node->name->parts);
+            }
+            $this->useStatements = [];
+
+            return;
+        }
+
+        if ($node instanceof Node\Stmt\UseUse) {
+            $this->useStatements[$node->alias] = implode('\\', $node->name->parts);
+
+            return;
+        }
+
+        if (!$node instanceof Node\Stmt\Class_) {
+            return;
+        }
+
+        $isContainer = false;
+        foreach ($node->implements as $interface) {
+            $name = implode('\\', $interface->parts);
+            if (isset($this->useStatements[$name])) {
+                $name = $this->useStatements[$name];
+            }
+
+            if ('Translation\Extractor\TranslationSourceLocationContainer' === $name) {
+                $isContainer = true;
+                break;
+            }
+        }
+
+        if (!$isContainer) {
+            return;
+        }
+
+        $sourceLocations = call_user_func([$this->namespace.'\\'.$node->name, 'getTranslationSourceLocations']);
+        if (!is_array($sourceLocations)) {
+            throw new \RuntimeException(sprintf('%s::getTranslationSourceLocations() was expected to return an array of SourceLocations, but got %s.', $this->namespace.'\\'.$node->name, gettype($sourceLocations)));
+        }
+
+        foreach ($sourceLocations as $sourceLocation) {
+            if (!$sourceLocation instanceof SourceLocation) {
+                throw new \RuntimeException(sprintf('%s::getTranslationSourceLocations() was expected to return an array of SourceLocations, but got an array which contains an item of type %s.', $this->namespace.'\\'.$node->name, gettype($sourceLocation)));
+            }
+
+            $this->collection->addLocation($sourceLocation);
+        }
+    }
+
+    public function leaveNode(Node $node)
+    {
+    }
+
+    public function afterTraverse(array $nodes)
+    {
+    }
+}
diff --git a/tests/Functional/Visitor/Php/SourceLocationContainerExtractorTest.php b/tests/Functional/Visitor/Php/SourceLocationContainerExtractorTest.php
new file mode 100644
index 0000000..560ab27
--- /dev/null
+++ b/tests/Functional/Visitor/Php/SourceLocationContainerExtractorTest.php
@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the PHP Translation package.
+ *
+ * (c) PHP Translation team <tobias.nyholm@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Translation\Extractor\Tests\Functional\Visitor\Php;
+
+use Translation\Extractor\Visitor\Php\SourceLocationContainerExtractor;
+use Translation\Extractor\Tests\Resources;
+
+class SourceLocationContainerExtractorTest extends BasePHPVisitorTest
+{
+    public function testExtract()
+    {
+        $collection = $this->getSourceLocations(new SourceLocationContainerExtractor(), Resources\Php\SourceLocationContainer::class);
+
+        $this->assertCount(2, $collection);
+        $source = $collection->first();
+        $this->assertEquals('foo', $source->getMessage());
+    }
+}
diff --git a/tests/Resources/Php/SourceLocationContainer.php b/tests/Resources/Php/SourceLocationContainer.php
new file mode 100644
index 0000000..ca696ab
--- /dev/null
+++ b/tests/Resources/Php/SourceLocationContainer.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Translation\Extractor\Tests\Resources\Php;
+
+use Translation\Extractor\Model\SourceLocation;
+use Translation\Extractor\TranslationSourceLocationContainer;
+
+class SourceLocationContainer implements TranslationSourceLocationContainer
+{
+    public static function getTranslationSourceLocations()
+    {
+        return [
+            SourceLocation::createHere('foo'),
+            SourceLocation::createHere('bar'),
+        ];
+    }
+}