diff --git a/src/Components/Block.php b/src/Components/Block.php
new file mode 100644
index 0000000..783a33a
--- /dev/null
+++ b/src/Components/Block.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Erusev\Parsedown\Components;
+
+use Erusev\Parsedown\Component;
+use Erusev\Parsedown\Parsing\Context;
+use Erusev\Parsedown\State;
+
+interface Block extends Component
+{
+    /**
+     * @param Context $Context
+     * @param Block|null $Block
+     * @param State|null $State
+     * @return static|null
+     */
+    public static function build(
+        Context $Context,
+        Block $Block = null,
+        State $State = null
+    );
+
+    /**
+     * Return true if the block was build encompassing the previous block
+     * $Block given to static::build, return false otherwise.
+     * @return bool
+     */
+    public function acquiredPrevious();
+}
diff --git a/src/Components/Inline.php b/src/Components/Inline.php
new file mode 100644
index 0000000..337d3ed
--- /dev/null
+++ b/src/Components/Inline.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Erusev\Parsedown\Components;
+
+use Erusev\Parsedown\Component;
+use Erusev\Parsedown\Parsing\Excerpt;
+use Erusev\Parsedown\State;
+
+interface Inline extends Component
+{
+    /**
+     * @param Excerpt $Excerpt
+     * @param State $State
+     * @return static|null
+     */
+    public static function build(Excerpt $Excerpt, State $State);
+
+    /**
+     * Number of characters consumed by the build action.
+     * @return int
+     * */
+    public function width();
+
+    /**
+     * Return an integer to declare that the inline should be treated as if it
+     * started from that position in the excerpt given to static::build.
+     * Return null to use the excerpt offset value.
+     * @return int|null
+     * */
+    public function modifyStartPositionTo();
+}