feat(ast): create Element interface

ipub/ast/ast.go

@@ -0,0 +1,37 @@
+package ast
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"slices"
+)
+
+type Element interface {
+	Kind() ElementKind
+
+	NextSibling() Element
+	SetNextSibling(Element)
+
+	PreviousSibling() Element
+	SetPreviousSibling(Element)
+
+	Parent() Element
+	SetParent(Element)
+
+	HasChildren() bool
+	ChildCount() uint
+
+	FirstChild() Element
+	LastChild() Element
+
+	AppendChild(self, v Element)
+	RemoveChild(self, v Element)
+
+	RemoveChildren(self Element)
+	ReplaceChild(self, v1, insertee Element)
+
+	InsertBefore(self, v1, insertee Element)
+	InsertAfter(self, v1, insertee Element)
+
+}