diff --git a/api/ProVM/Alias/Filesystem.php b/api/ProVM/Alias/Filesystem.php
index 89916ac..8d32a89 100644
--- a/api/ProVM/Alias/Filesystem.php
+++ b/api/ProVM/Alias/Filesystem.php
@@ -3,6 +3,7 @@ namespace ProVM\Alias;
 
 use function Safe\{touch,mkdir,unlink};
 use ProVM\Concept\Filesystem as FilesystemInterface;
+use ProVM\Implement\Path;
 
 abstract class Filesystem implements FilesystemInterface
 {
@@ -19,7 +20,7 @@ abstract class Filesystem implements FilesystemInterface
 
     public function buildPath(string $relative_path): string
     {
-        return implode(DIRECTORY_SEPARATOR, [
+        return Path::fromArray([
             $this->getBasePath(),
             $relative_path
         ]);
diff --git a/api/ProVM/Concept/Path.php b/api/ProVM/Concept/Path.php
new file mode 100644
index 0000000..c5807c9
--- /dev/null
+++ b/api/ProVM/Concept/Path.php
@@ -0,0 +1,15 @@
+<?php
+namespace ProVM\Concept;
+
+use ArrayAccess;
+
+interface Path extends ArrayAccess
+{
+    public function compose(string $base_path): Path;
+    public function add(string $path_segment): Path;
+    public function build(): string;
+    public static function fromArray(array $path): string;
+
+    public static function isAbsolute(string $path): bool;
+    public static function isRelative(string $path): bool;
+}
diff --git a/api/ProVM/Implement/Collection.php b/api/ProVM/Implement/Collection.php
index 8bd6737..098fad1 100644
--- a/api/ProVM/Implement/Collection.php
+++ b/api/ProVM/Implement/Collection.php
@@ -2,6 +2,7 @@
 namespace ProVM\Implement;
 
 use Psr\Collection\CollectionInterface;
+use ReflectionFunction;
 
 class Collection implements CollectionInterface
 {
@@ -41,7 +42,7 @@ class Collection implements CollectionInterface
     }
     protected function processCallable(Callable $value)
     {
-        $ref = new \ReflectionFunction($value);
+        $ref = new ReflectionFunction($value);
         $param_array = [];
         $params = $ref->getParameters();
         foreach ($params as $p) {
diff --git a/api/ProVM/Implement/File.php b/api/ProVM/Implement/File.php
index 3c35b3a..3c1a16a 100644
--- a/api/ProVM/Implement/File.php
+++ b/api/ProVM/Implement/File.php
@@ -1,7 +1,7 @@
 <?php
 namespace ProVM\Implement;
 
-use Common\Alias\File as BaseFile;
+use ProVM\Alias\File as BaseFile;
 
 class File extends BaseFile
 {
diff --git a/api/ProVM/Implement/Filesystem.php b/api/ProVM/Implement/Filesystem.php
index 7b88d65..c935524 100644
--- a/api/ProVM/Implement/Filesystem.php
+++ b/api/ProVM/Implement/Filesystem.php
@@ -1,8 +1,8 @@
 <?php
 namespace ProVM\Implement;
 
-use Common\Concept\File as FileInterface;
-use Common\Alias\Filesystem as BaseFilesystem;
+use ProVM\Concept\File as FileInterface;
+use ProVM\Alias\Filesystem as BaseFilesystem;
 
 class Filesystem extends BaseFilesystem
 {
diff --git a/api/ProVM/Implement/Path.php b/api/ProVM/Implement/Path.php
new file mode 100644
index 0000000..3e891f2
--- /dev/null
+++ b/api/ProVM/Implement/Path.php
@@ -0,0 +1,58 @@
+<?php
+namespace ProVM\Implement;
+
+use ProVM\Concept\Path as PathInterface;
+
+class Path implements PathInterface
+{
+    protected array $path;
+    public function compose(string $base_path): PathInterface
+    {
+        $this->path = [];
+        return $this->add($base_path);
+    }
+    public function add(string $path_segment): PathInterface
+    {
+        $this->path []= $path_segment;
+        return $this;
+    }
+    public function build(): string
+    {
+        return implode(DIRECTORY_SEPARATOR, $this->path);
+    }
+    public static function fromArray(array $path): string
+    {
+        $output = new Path();
+        $output->compose(array_shift($path));
+        foreach ($path as $p) {
+            $output->add($p);
+        }
+        return $output->build();
+    }
+
+    public static function isAbsolute(string $path): bool
+    {
+        return !file_exists(Path::fromArray([$path, '..']));
+    }
+    public static function isRelative(string $path): bool
+    {
+        return !Path::isAbsolute($path);
+    }
+
+    public function offsetExists(mixed $offset): bool
+    {
+        return isset($this->path[$offset]);
+    }
+    public function offsetGet(mixed $offset): mixed
+    {
+        return $this->path[$offset];
+    }
+    public function offsetSet(mixed $offset, mixed $value): void
+    {
+        $this->path[$offset] = $value;
+    }
+    public function offsetUnset(mixed $offset): void
+    {
+        unset($this->path[$offset]);
+    }
+}
diff --git a/api/setup/settings/02_common.php b/api/setup/settings/02_common.php
index ee3d5da..38c7030 100644
--- a/api/setup/settings/02_common.php
+++ b/api/setup/settings/02_common.php
@@ -6,25 +6,25 @@ return [
         return \ProVM\Implement\Collection::fromArray([
             'base' => dirname(__DIR__, 2),
             'resources' => function(\Psr\Collection\CollectionInterface $collection) {
-                return implode(DIRECTORY_SEPARATOR, [
+                return \ProVM\Implement\Path::fromArray([
                     $collection['base'],
                     'resources'
                 ]);
             },
             'documentation' => function(\Psr\Collection\CollectionInterface $collection) {
-                return implode(DIRECTORY_SEPARATOR, [
+                return \ProVM\Implement\Path::fromArray([
                     $collection['resources'],
                     'documentation'
                 ]);
             },
             'routes' => function(\Psr\Collection\CollectionInterface $collection) {
-                return implode(DIRECTORY_SEPARATOR, [
+                return \ProVM\Implement\Path::fromArray([
                     $collection['resources'],
                     'routes'
                 ]);
             },
             'public' => function(\Psr\Collection\CollectionInterface $collection) {
-                return implode(DIRECTORY_SEPARATOR, [
+                return \ProVM\Implement\Path::fromArray([
                     $collection['base'],
                     'public'
                 ]);