diff --git a/snark-document-builder/build.gradle.kts b/snark-document-builder/build.gradle.kts
index 4895628..d7d9d05 100644
--- a/snark-document-builder/build.gradle.kts
+++ b/snark-document-builder/build.gradle.kts
@@ -1,6 +1,7 @@
 plugins {
     id("space.kscience.gradle.jvm")
     `maven-publish`
+    id("kotlinx-serialization")
 }
 
 val coroutinesVersion = space.kscience.gradle.KScienceVersions.coroutinesVersion
@@ -12,4 +13,5 @@ dependencies {
 
     implementation(project(":snark-storage-driver"))
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.3")
 }
diff --git a/snark-document-builder/src/main/kotlin/DocumentBuilder.kt b/snark-document-builder/src/main/kotlin/DocumentBuilder.kt
new file mode 100644
index 0000000..891848c
--- /dev/null
+++ b/snark-document-builder/src/main/kotlin/DocumentBuilder.kt
@@ -0,0 +1,16 @@
+package documentBuilder
+
+import com.fasterxml.jackson.core.io.BigDecimalParser
+import space.kscience.snark.storage.*
+import space.kscience.snark.storage.local.LocalDirectory
+import java.nio.file.Path
+
+val DEFAULT_DOCUMENT_ROOT = "main.md"
+
+public suspend fun buildDocument(documentPath: String) {
+    val documentDirectory: Directory = LocalDirectory(documentPath)
+    val documentRoot = documentDirectory.get(DEFAULT_DOCUMENT_ROOT)
+
+    // val (dependencies, vertex) = parseMd(documentRoot.readAll())
+
+}
\ No newline at end of file
diff --git a/snark-document-builder/src/main/kotlin/Hello.kt b/snark-document-builder/src/main/kotlin/Hello.kt
deleted file mode 100644
index 027138f..0000000
--- a/snark-document-builder/src/main/kotlin/Hello.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package hello
-
-import com.fasterxml.jackson.core.io.BigDecimalParser
-import space.kscience.snark.storage.*
-import space.kscience.snark.storage.local.LocalDirectory
-import java.nio.file.Path
-
-
-public suspend fun doSomethingEssential() {
-    val dir: Directory = LocalDirectory(".")
-    dir.get("notexists")
-}
\ No newline at end of file
diff --git a/snark-document-builder/src/main/kotlin/MdParser.kt b/snark-document-builder/src/main/kotlin/MdParser.kt
new file mode 100644
index 0000000..0d40c67
--- /dev/null
+++ b/snark-document-builder/src/main/kotlin/MdParser.kt
@@ -0,0 +1,112 @@
+package documentBuilder
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.SerialName
+import com.fasterxml.jackson.annotation.JsonSubTypes
+import com.fasterxml.jackson.annotation.JsonTypeInfo
+
+sealed interface DependencyGraphEdge {
+}
+ 
+data class IncludeDependency(
+    val parentNode: MdAstParent,
+    val dependentNode: Iterator<MdAstElement>,
+    val includeList: List<String>
+) : DependencyGraphEdge
+ 
+data class DependencyGraphVertex(
+    val mdAst: MdAstRoot,
+    val dependencies: MutableList<DependencyGraphEdge>
+)
+
+// data class DependencyGraph(
+//     val root: DependencyGraphVertex
+// )
+
+enum class DependenceType {
+    INCLUDE
+}
+
+data class ParseResult(val dependencies: Dependencies, val vertex: DependencyGraphVertex)
+
+typealias Dependencies = HashMap<DependenceType, MutableList<String>>
+
+// public suspend fun parseMd(mdFile: ByteArray): ParseResult {
+// }
+
+@Serializable
+data class Point(val line: Int, val column: Int, val offset: Int)
+
+@Serializable
+data class Position(val start: Point, val end: Point)
+
+@JsonTypeInfo(
+    use = JsonTypeInfo.Id.NAME,
+    include = JsonTypeInfo.As.PROPERTY,
+    property = "type"
+)
+@JsonSubTypes(
+    JsonSubTypes.Type(value = MdAstRoot::class, name = "root"),
+    JsonSubTypes.Type(value = MdAstParagraph::class, name = "paragraph"),
+    JsonSubTypes.Type(value = MdAstText::class, name = "text"),
+    JsonSubTypes.Type(value = MdAstHeading::class, name = "heading"),
+    JsonSubTypes.Type(value = MdAstCode::class, name = "code"),
+    JsonSubTypes.Type(value = MdAstBlockquote::class, name = "blockquote")
+)
+@Serializable
+sealed interface MdAstElement{
+    abstract var position: Position
+}
+
+@Serializable
+sealed interface MdAstParent: MdAstElement{
+    var children: List<MdAstElement>
+}
+
+@Serializable
+@SerialName("root")
+data class MdAstRoot(
+    override var children: List<MdAstElement>,
+    override var position: Position
+): MdAstParent
+
+
+@Serializable
+@SerialName("paragraph")
+data class MdAstParagraph(
+    override var children: List<MdAstElement>,
+    override var position: Position
+): MdAstParent
+
+
+@Serializable
+@SerialName("text")
+data class MdAstText(
+    val value: String,
+    override var position: Position
+): MdAstElement
+
+
+@Serializable
+@SerialName("heading")
+data class MdAstHeading(
+    val depth: Int, 
+    override var children: List<MdAstElement>,
+    override var position: Position
+): MdAstParent
+
+@Serializable
+@SerialName("code")
+data class MdAstCode(
+    var lang: String? = null,
+    var meta: String? = null,
+    var value: String,
+    override var position: Position,
+) : MdAstElement
+
+@Serializable
+@SerialName("blockquote")
+data class MdAstBlockquote(
+    override var children: List<MdAstElement>,
+    override var position: Position
+): MdAstParent
\ No newline at end of file
diff --git a/snark-document-builder/src/test/kotlin/Hello.kt b/snark-document-builder/src/test/kotlin/DocumentBuilder.kt
similarity index 71%
rename from snark-document-builder/src/test/kotlin/Hello.kt
rename to snark-document-builder/src/test/kotlin/DocumentBuilder.kt
index 4ba4d64..1c4436f 100644
--- a/snark-document-builder/src/test/kotlin/Hello.kt
+++ b/snark-document-builder/src/test/kotlin/DocumentBuilder.kt
@@ -1,4 +1,4 @@
-package hello
+package documentBuilder
 
 import org.junit.jupiter.api.Test
 import kotlinx.coroutines.runBlocking
@@ -6,6 +6,6 @@ import kotlinx.coroutines.runBlocking
 class SomeTest {
     @Test
     fun testEssential() = runBlocking {
-        doSomethingEssential()
+        buildDocument("./example")
     }
 }