diff --git a/assets/webui/index.html b/assets/webui/index.html
index bb021d2..6bc01b6 100644
--- a/assets/webui/index.html
+++ b/assets/webui/index.html
@@ -63,11 +63,11 @@
 				<span>文件</span>
 			</div>
 			<div class="editor-group editor-objects">
+				<button id="compositeBackButton" class="button" type="button" title="返回上层" hidden>返回</button>
 				<button id="selectObjectButton" class="button" type="button" aria-pressed="true">选择</button>
 				<button id="multiSelectButton" class="button" type="button" aria-pressed="false" title="多选对象">多选</button>
 				<button id="editObjectButton" class="button" type="button" aria-label="修改对象" disabled>修改</button>
 				<button id="copyObjectButton" class="button" type="button" aria-label="复制对象" disabled>复制</button>
-				<button id="compositeBackButton" class="button" type="button" title="返回上层" hidden>返回</button>
 				<button id="deleteObjectButton" class="button" type="button" disabled>删除</button>
 				<select id="objectOrder" class="order-select" aria-label="对象层级" disabled>
 					<option value="" hidden>层级</option>
diff --git a/assets/webui/ofdgo.js b/assets/webui/ofdgo.js
index f93d8d2..97319f6 100644
--- a/assets/webui/ofdgo.js
+++ b/assets/webui/ofdgo.js
@@ -1005,7 +1005,7 @@ function openObjectStyle() {
 	const alpha = shared("alpha", 255), dash = shared("dashPattern", "");
 	el.objectOpacity.value = alpha === null ? "" : String(Math.round((1 - alpha / 255) * 10000) / 100);
 	el.objectOpacity.placeholder = alpha === null ? "混合" : "";
-	el.objectStrokeFields.hidden = Boolean(state.composite) || !items.every(item => item.type === "PathObject");
+	el.objectStrokeFields.hidden = !items.every(item => item.type === "PathObject" && (!item.scoped || canEditObject(item, "paint")));
 	el.objectDash.value = dash === null ? "mixed" : dash === "" ? "solid" : "custom";
 	el.objectDashPattern.value = dash || "";
 	el.objectDashRow.hidden = el.objectDash.value !== "custom";
@@ -1313,7 +1313,7 @@ async function editCanvasObject(item) {
 	if (canEditObject(item, "enter")) return enterCompositeScope(item.index, item.id);
 	if (item.type === "TextObject") {
 		if (!confirmTextReflow(item)) return;
-	} else if (!canEditObject(item, "update")) return;
+	} else if (!canEditObject(item, item.type === "ImageObject" ? "replaceImage" : "update")) return;
 	if (item.type === "PathObject") {
 		el.shapeWidth.focus();
 		return;
@@ -1425,7 +1425,7 @@ function openInsertPanel(item = null) {
 	}
 	el.insertForm.reset();
 	state.insertObject = item;
-	el.insertFitRow.hidden = !item;
+	el.insertFitRow.hidden = !item || Boolean(item.scoped);
 	el.insertPanel.setAttribute("aria-label", item ? "替换图片" : "添加图片");
 	el.insertSubmit.textContent = item ? "替换" : "添加";
 	el.insertStatus.textContent = "";
@@ -1614,8 +1614,9 @@ async function insertObject(event) {
 		if (openSeq !== state.openSeq) {
 			return;
 		}
-		const doc = item
-			? await callWASM("ofdgoReplaceImage", item.index, item.id, data, el.insertFit.value)
+		const doc = item?.scoped
+			? await callWASM("ofdgoChangeCompositeObjects", item.index, state.composite.key, [item.id], "image", data)
+			: item ? await callWASM("ofdgoReplaceImage", item.index, item.id, data, el.insertFit.value)
 			: await callWASM("ofdgoInsertImage", index, data, x, y, page.width - x * 2);
 		if (openSeq !== state.openSeq) {
 			return;
@@ -1831,7 +1832,8 @@ async function changeDocument(name, item, ...args) {
 		}
 		const scope = state.composite;
 		const operation = { ofdgoTransformObject: "transform", ofdgoTransformObjects: "transform", ofdgoRotateObjects: "rotate", ofdgoFlipObjects: "flip", ofdgoResizeObjects: "resize",
-			ofdgoAlignObject: "align", ofdgoAlignObjects: "align", ofdgoDistributeObjects: "distribute", ofdgoStyleObjects: "style", ofdgoUpdatePathStyle: "paint", ofdgoCompositeTextColor: "textColor" }[name];
+			ofdgoAlignObject: "align", ofdgoAlignObjects: "align", ofdgoDistributeObjects: "distribute", ofdgoStyleObjects: "style", ofdgoUpdatePathStyle: "paint", ofdgoCompositeTextColor: "textColor",
+			ofdgoDeleteObject: "delete", ofdgoDeleteObjects: "delete", ofdgoCopyObjects: "copy", ofdgoOrderObjects: "order" }[name];
 		const members = item?.items || (item ? [item] : []);
 		const scoped = scope && members.length && members.every(member => member.scoped);
 		if (!item) resetCompositeScope();
@@ -1872,6 +1874,7 @@ async function changeDocument(name, item, ...args) {
 			setPan(false);
 			canvasEditor.pendingSelection = { index: item?.index ?? args[0], ids: doc.selectedIDs };
 		}
+		if (scoped && name === "ofdgoOrderObjects") canvasEditor.pendingSelection = { index: item.index, ids: doc.selectedIDs };
 		openSeq = ++state.openSeq;
 		if (item || name === "ofdgoPasteObjects" || name === "ofdgoInsertShape" || name === "ofdgoInsertText" || name === "ofdgoInsertImage") {
 			await refreshEditorPage(doc, item ? item.index : args[0], openSeq, clearSelection);
@@ -3694,6 +3697,11 @@ function copyEditorSelection(event) {
 		|| canvasEditor.input || canvasEditor.crop || canvasEditor.drag || document.body.hasAttribute("aria-busy")) return false;
 	const items = canvasEditor.items().slice().sort((a, b) => a.order - b.order);
 	const cut = event.type === "cut";
+	if (state.composite) {
+		event.preventDefault();
+		setStatus("内部对象请用复制按钮");
+		return true;
+	}
 	if (!canEditObject(canvasEditor.selected, "copy") || cut && !canEditObject(canvasEditor.selected, "delete")) {
 		event.preventDefault();
 		setStatus(cut ? "对象不可剪切" : "对象不可复制");
@@ -5536,10 +5544,11 @@ function updateEditorTools() {
 function updateObjectControls(item, reset = false) {
 	el.compositeBackButton.hidden = !state.composite;
 	el.compositeBackButton.disabled = !state.ready || state.exporting;
-	el.deleteObjectButton.hidden = Boolean(state.composite);
+	el.selectObjectButton.hidden = Boolean(state.composite);
+	const members = item?.items || (item ? [item] : []);
 	const disabled = !item || Boolean(item.draft) || !state.ready || state.exporting;
 	el.deleteObjectButton.disabled = disabled || !canEditObject(item, "delete");
-	el.copyObjectButton.disabled = disabled || !canEditObject(item, "copy");
+	el.copyObjectButton.disabled = disabled || !canEditObject(item, "copy") || Boolean(state.composite && members.some(member => member.container !== members[0].container));
 	el.objectStyleButton.disabled = disabled || !canEditObject(item, "transform");
 	const cropping = Boolean(canvasEditor.crop);
 	el.objectBoundsButton.disabled = disabled || cropping || !canEditObject(item, "transform");
@@ -5555,7 +5564,7 @@ function updateObjectControls(item, reset = false) {
 	el.resetCropButton.disabled = el.cropImageButton.disabled || !cropping && (!item.imageBounds || ["x", "y", "width", "height"].every(key => Math.abs(item[key] - item.imageBounds[key]) < 1e-9));
 	el.objectDistribute.disabled = el.objectAlign.disabled || !item.items || item.items.length < 3;
 	el.editObjectButton.disabled = disabled || Boolean(item.items) || !canEditObject(item, "enter") && (item.type === "PathObject"
-		|| !canEditObject(item, item.type === "TextObject" ? "reflow" : "update"));
+		|| !canEditObject(item, item.type === "TextObject" ? "reflow" : item.type === "ImageObject" ? "replaceImage" : "update"));
 	el.multiSelectButton.disabled = !state.editing || !canvasEditor.enabled || !state.ready || state.exporting;
 	const selection = selectedText(item);
 	const text = selection ? currentTextStyle() : state.textDefaults;
@@ -5608,7 +5617,6 @@ function updateObjectControls(item, reset = false) {
 		el.shapeWidth.value = "1";
 	}
 	updateDrawingControls();
-	const members = item?.items || (item ? [item] : []);
 	const orders = members.map(member => member.position).sort((a, b) => a - b);
 	const count = members[0]?.count || 0;
 	const canRaise = orders.some((order, i) => order !== count - orders.length + i);
diff --git a/assets/webui/ofdgo_edit.js b/assets/webui/ofdgo_edit.js
index 6e3b516..b4214be 100644
--- a/assets/webui/ofdgo_edit.js
+++ b/assets/webui/ofdgo_edit.js
@@ -190,7 +190,8 @@ export function objectEditReason(item) {
 		if (!reason) return "";
 		const message = labels[object.capabilities.reasonCode] || "暂不支持此对象特性";
 		const available = object.capabilities.transform ? object.capabilities.paint ? "仍可移动、改色" : "仍可移动"
-			: object.capabilities.copy && object.capabilities.delete ? "仍可复制、删除" : "暂不可编辑";
+			: object.capabilities.replaceImage ? "仍可替换图片" : object.capabilities.copy && object.capabilities.delete ? "仍可复制、删除"
+			: object.capabilities.delete ? "仍可删除" : "暂不可编辑";
 		return object.capabilities.missingGlyphs ? missingGlyphMessage(object.capabilities.missingGlyphs, available) : `${message}，${available}`;
 	});
 	return [...new Set(reasons.filter(Boolean))].join("；");
diff --git a/internal/webui/wasm.go b/internal/webui/wasm.go
index 8b87b45..cd27c34 100644
--- a/internal/webui/wasm.go
+++ b/internal/webui/wasm.go
@@ -832,7 +832,7 @@ func editorObjects(index int, text *ofdgo.PageText) ([]any, error) {
 // 返回: map[string]any 前端能力
 func editorCapabilities(capability ofdgo.ObjectCapabilities, kind string) map[string]any {
 	result := map[string]any{"update": capability.Update, "paint": capability.Paint, "replaceFont": capability.ReplaceFont, "reflow": capability.Reflow, "layoutKnown": capability.LayoutKnown, "transform": capability.Transform, "arrange": capability.Arrange, "copy": capability.Copy, "delete": capability.Delete, "order": capability.Order, "reason": capability.Reason, "reasonCode": string(capability.ReasonCode),
-		"enter": capability.Transform && (kind == "CompositeObject" || kind == "CompositeGraphicUnit")}
+		"replaceImage": capability.ReplaceImage, "enter": capability.Transform && (kind == "CompositeObject" || kind == "CompositeGraphicUnit")}
 	if missing := capability.MissingGlyphs; missing != nil {
 		result["missingGlyphs"] = map[string]any{"fontID": missing.FontID, "characters": missing.Characters}
 	}
@@ -919,7 +919,7 @@ func compositeObjects(args []js.Value) (any, error) {
 		if box.W <= 0 || box.H <= 0 {
 			continue
 		}
-		item := map[string]any{"id": fmt.Sprintf("%s/%d", key, i), "type": member.Object.Type, "x": box.X, "y": box.Y, "width": box.W, "height": box.H, "order": i, "position": i, "count": len(members), "container": key, "scoped": true, "contours": member.Contours,
+		item := map[string]any{"id": fmt.Sprintf("%s/%d", key, i), "type": member.Object.Type, "x": box.X, "y": box.Y, "width": box.W, "height": box.H, "order": i, "position": member.Position.Index, "count": member.Position.Count, "container": key + ":" + member.Position.Container, "scoped": true, "contours": member.Contours,
 			"capabilities": editorCapabilities(member.Capabilities, member.Object.Type)}
 		editorAppearance(item, member.Object, member.Capabilities.Paint, member.StrokeScale)
 		if member.Object.Type == "TextObject" {
@@ -932,11 +932,12 @@ func compositeObjects(args []js.Value) (any, error) {
 	return objects, nil
 }
 
-// changeCompositeObjects 复用库层内部选区变换与单次撤销
+// changeCompositeObjects 提交内部选区操作，结构变化后返回新的选区路径
 // 入参: args 页面索引、父路径、成员路径列表、操作及参数
 // 返回: any 文档信息, error 错误信息
 func changeCompositeObjects(args []js.Value) (any, error) {
-	return changeObjects(func() error {
+	var selected []int
+	result, err := changeObjects(func() error {
 		key := args[1].String()
 		path, err := compositePath(key)
 		if err != nil {
@@ -957,6 +958,23 @@ func changeCompositeObjects(args []js.Value) (any, error) {
 		page := args[0].Int()
 		operation := args[3].String()
 		switch operation {
+		case "delete":
+			return currentEditor.DeleteCompositeObjects(page, path, indexes)
+		case "copy":
+			selected, err = currentEditor.CopyCompositeObjects(page, path, indexes, args[4].Float(), args[5].Float())
+			return err
+		case "order":
+			selected, err = currentEditor.OrderCompositeObjects(page, path, indexes, args[4].String())
+			return err
+		case "image":
+			if len(indexes) != 1 {
+				return fmt.Errorf("image replacement requires one member")
+			}
+			data, err := bytesFromJS(args[4])
+			if err != nil {
+				return err
+			}
+			return currentEditor.ReplaceCompositeImage(page, path, indexes[0], data)
 		case "transform":
 			return currentEditor.TransformCompositeObjects(page, path, indexes, args[4].Float(), args[5].Float(), args[6].Float())
 		case "rotate":
@@ -1007,6 +1025,17 @@ func changeCompositeObjects(args []js.Value) (any, error) {
 			return fmt.Errorf("unsupported composite operation")
 		}
 	})
+	if err != nil {
+		return nil, err
+	}
+	if selected == nil {
+		return result, nil
+	}
+	doc := editorSelectionInfo{editorInfo: result.(editorInfo)}
+	for _, index := range selected {
+		doc.SelectedIDs = append(doc.SelectedIDs, fmt.Sprintf("%s/%d", args[1].String(), index))
+	}
+	return doc, nil
 }
 
 // editorFont 读取对象实际使用的内嵌字体，供画布输入使用
diff --git a/ofdgo_editor_batch.go b/ofdgo_editor_batch.go
index cf714db..0f56776 100644
--- a/ofdgo_editor_batch.go
+++ b/ofdgo_editor_batch.go
@@ -219,6 +219,17 @@ func (e *Editor) OrderObjects(page int, ids []string, order string) error {
 	for _, index := range indexes {
 		selected[slices.Index(siblings, index.index)] = true
 	}
+	orderEditorObjects(objects, selected, order)
+	for i, index := range siblings {
+		layers[indexes[0].layer].Objects[index] = objects[i]
+	}
+	e.replaceLayers(page, layers)
+	return nil
+}
+
+// orderEditorObjects 调整选区层级，保持选中及未选中对象各自的相对顺序
+// 入参: objects 同容器对象, selected 选中状态, order 排序方向
+func orderEditorObjects[T any](objects []T, selected []bool, order string) {
 	switch order {
 	case "up":
 		for i := len(objects) - 2; i >= 0; i-- {
@@ -235,7 +246,7 @@ func (e *Editor) OrderObjects(page int, ids []string, order string) error {
 			}
 		}
 	default:
-		ordered := make([]GraphicObject, 0, len(objects))
+		ordered := make([]T, 0, len(objects))
 		for _, takeSelected := range []bool{order == "bottom", order != "bottom"} {
 			for i, object := range objects {
 				if selected[i] == takeSelected {
@@ -243,13 +254,8 @@ func (e *Editor) OrderObjects(page int, ids []string, order string) error {
 				}
 			}
 		}
-		objects = ordered
+		copy(objects, ordered)
 	}
-	for i, index := range siblings {
-		layers[indexes[0].layer].Objects[index] = objects[i]
-	}
-	e.replaceLayers(page, layers)
-	return nil
 }
 
 // DistributeObjects 按可见范围等距分布同页对象，固定两端对象，保留绘制顺序
diff --git a/ofdgo_editor_composite.go b/ofdgo_editor_composite.go
index 60e6270..90aaa8e 100644
--- a/ofdgo_editor_composite.go
+++ b/ofdgo_editor_composite.go
@@ -34,12 +34,14 @@ type ObjectPath struct {
 
 // CompositeMember 复合对象的直接成员快照，Object包含有效样式，不用于整体替换原对象
 // Bounds与Contours使用页面毫米坐标，StrokeScale为对象描边到页面的倍率
+// Position表示当前范围内的直接容器位置，结构操作后需重新枚举
 type CompositeMember struct {
 	Object       GraphicObject
 	Bounds       Box
 	Contours     []ObjectContour
 	StrokeScale  float64
 	Capabilities ObjectCapabilities
+	Position     ObjectPosition
 	Transform    bool
 }
 
@@ -59,6 +61,9 @@ type editorCompositeNode struct {
 	expanded      bool
 	changed       bool
 	span          *editorXML
+	owner         *editorCompositeNode
+	patches       []editorXMLPatch
+	index         int
 }
 
 // CompositeObjects 枚举复合对象的直接可绘制成员，资源引用层不占用路径层级
@@ -189,6 +194,9 @@ func (e *Editor) compositeScope(page int, path ObjectPath) (*Reader, *Renderer,
 			break
 		}
 		if depth == len(path.Children) {
+			for i, member := range members {
+				member.index = i
+			}
 			return reader, renderer, root, members, nil
 		}
 		i := path.Children[depth]
@@ -300,6 +308,7 @@ func (n *editorCompositeNode) members(reader *Reader, renderer *Renderer, visiti
 					}
 					item.parent, item.boundaryInCTM, item.defaults, item.clip, item.visible, item.span = matrix, n.boundaryInCTM, defaults, clip, visible, child
 					item.drawParams = drawParams
+					item.owner = n
 					n.children = append(n.children, item)
 				}
 			}
@@ -332,6 +341,18 @@ func (n *editorCompositeNode) members(reader *Reader, renderer *Renderer, visiti
 // 返回: []CompositeMember 独立快照及操作能力
 func (e *Editor) measureCompositeMembers(renderer *Renderer, nodes []*editorCompositeNode) []CompositeMember {
 	result := make([]CompositeMember, len(nodes))
+	positions := make(map[*editorXML]ObjectPosition)
+	orderable := make(map[*editorXML]bool)
+	for _, node := range nodes {
+		parent := node.span.parent
+		position := positions[parent]
+		if position.Count == 0 {
+			position.Container = fmt.Sprint(node.index)
+			orderable[parent] = editorContainerOrderable(parent)
+		}
+		position.Count++
+		positions[parent] = position
+	}
 	for i, node := range nodes {
 		bounds := &boundsRenderer{collect: true}
 		object := node.object
@@ -346,7 +367,8 @@ func (e *Editor) measureCompositeMembers(renderer *Renderer, nodes []*editorComp
 		_, invertible := node.parent.Invert()
 		borderActions := node.object.Type == "ImageObject" && node.object.ImageObject.Border != nil && len(node.object.ImageObject.Actions) != 0
 		transform := invertible && editorXMLTransformable(node.node) && validateEditorGeometry(node.object) == nil && !borderActions
-		capability := ObjectCapabilities{Transform: transform, Arrange: transform && bounds.box.W > 0 && bounds.box.H > 0}
+		capability := ObjectCapabilities{Transform: transform, Arrange: transform && bounds.box.W > 0 && bounds.box.H > 0,
+			Delete: true, Copy: transform && editorXMLCopyable(node.node), Order: orderable[node.span.parent], ReplaceImage: node.object.Type == "ImageObject"}
 		style, err := e.compositeMemberStyle(node)
 		if !transform {
 			capability.ReasonCode, capability.Reason = EditUnsupportedContainer, "composite member cannot be transformed"
@@ -360,7 +382,10 @@ func (e *Editor) measureCompositeMembers(renderer *Renderer, nodes []*editorComp
 		}
 		_, ctm := editorGeometry(node.object)
 		matrix := node.parent.Multiply(NewMatrix(ctm))
-		result[i] = CompositeMember{Object: style, Bounds: bounds.box, Contours: bounds.contours, StrokeScale: math.Sqrt(math.Abs(matrix.a*matrix.d - matrix.b*matrix.c)), Capabilities: capability, Transform: transform}
+		position := positions[node.span.parent]
+		result[i] = CompositeMember{Object: style, Bounds: bounds.box, Contours: bounds.contours, StrokeScale: math.Sqrt(math.Abs(matrix.a*matrix.d - matrix.b*matrix.c)), Capabilities: capability, Position: position, Transform: transform}
+		position.Index++
+		positions[node.span.parent] = position
 	}
 	return result
 }
@@ -386,15 +411,12 @@ func (e *Editor) compositeMemberStyle(node *editorCompositeNode) (GraphicObject,
 }
 
 // StyleCompositeObjects 原子修改成员透明度、文字颜色及路径填充、描边和线宽
-// 不重排文字，不改写继承参数；暂不支持虚线及端点样式
+// 不重排文字，不改写继承参数；显式实线覆盖原虚线继承
 // 入参: page 页面索引, path 父路径, indexes 成员序号, style 待修改属性，线宽使用页面毫米
 // 返回: error 错误信息
 func (e *Editor) StyleCompositeObjects(page int, path ObjectPath, indexes []int, style ObjectStyle) error {
-	if style.DashPattern != nil || style.DashOffset != nil || style.Cap != nil || style.Join != nil {
-		return fmt.Errorf("composite stroke parameters are not supported")
-	}
 	return e.editCompositeObjects(page, path, indexes, func(_ *Renderer, nodes []*editorCompositeNode, members []CompositeMember) error {
-		paint := style.Fill != nil || style.Stroke != nil || style.FillColor != nil || style.StrokeColor != nil || style.LineWidth != nil
+		paint := style.Fill != nil || style.Stroke != nil || style.FillColor != nil || style.StrokeColor != nil || style.LineWidth != nil || style.DashPattern != nil || style.DashOffset != nil || style.Cap != nil || style.Join != nil
 		for i, node := range nodes {
 			capability := members[i].Capabilities
 			if !capability.Transform || paint && !capability.Paint {
@@ -417,18 +439,9 @@ func (e *Editor) StyleCompositeObjects(page int, path ObjectPath, indexes []int,
 			if err != nil {
 				return err
 			}
-			data, err := editorXMLObject(node.data, node.node, node.object, object)
-			if err != nil {
+			if err := node.update(object); err != nil {
 				return err
 			}
-			if bytes.Equal(data, node.data) {
-				continue
-			}
-			updated, err := newEditorCompositeNode(data)
-			if err != nil {
-				return err
-			}
-			node.data, node.node, node.object, node.changed = data, updated.node, updated.object, true
 		}
 		return nil
 	})
@@ -548,6 +561,14 @@ func (e *Editor) editCompositeObjects(page int, path ObjectPath, indexes []int,
 	ready := e.source.idsReady
 	defer func() {
 		if err != nil {
+			removed := make(map[string]bool)
+			for _, resource := range e.resources[count:] {
+				if resource.image != nil {
+					removed[resource.image.ID] = true
+					delete(e.images, resource.image.ID)
+				}
+			}
+			maps.DeleteFunc(e.resourceID, func(_ editorResourceKey, id string) bool { return removed[id] })
 			clear(e.resources[count:])
 			e.resources, e.maxID = e.resources[:count], maximum
 			e.source.idsReady = ready
@@ -698,7 +719,7 @@ func compositeBoundary(object GraphicObject, parent Matrix, inward bool) Graphic
 // 入参: node 实例节点
 // 返回: []byte 新片段, bool 是否变化, error 错误信息
 func (e *Editor) writeCompositeNode(node *editorCompositeNode) ([]byte, bool, error) {
-	var patches []editorXMLPatch
+	patches := slices.Clone(node.patches)
 	for _, child := range node.children {
 		data, changed, err := e.writeCompositeNode(child)
 		if err != nil {
@@ -748,22 +769,7 @@ func (e *Editor) addCompositeResource(data []byte) (string, error) {
 		return "", fmt.Errorf("composite contains unsupported identifiers")
 	}
 	ids := make(map[string]string)
-	var collect func(*editorXML) error
-	collect = func(node *editorXML) error {
-		if id := editorResourceID(node.attr("ID")); id != "" {
-			if ids[id] != "" {
-				return fmt.Errorf("duplicate object ID %q", id)
-			}
-			ids[id] = e.nextID()
-		}
-		for _, child := range node.children {
-			if err := collect(child); err != nil {
-				return err
-			}
-		}
-		return nil
-	}
-	if err := collect(root); err != nil {
+	if err := e.collectCompositeIDs(root, ids); err != nil {
 		return "", err
 	}
 	id := ids[editorResourceID(root.attr("ID"))]
diff --git a/ofdgo_editor_composite_ops.go b/ofdgo_editor_composite_ops.go
new file mode 100644
index 0000000..9d42169
--- /dev/null
+++ b/ofdgo_editor_composite_ops.go
@@ -0,0 +1,187 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"fmt"
+	"slices"
+)
+
+// siblings 获取同一原始容器内的直接绘制成员，不跨越资源和页块
+// 返回: []*editorCompositeNode 按绘制顺序排列的成员
+func (n *editorCompositeNode) siblings() []*editorCompositeNode {
+	var result []*editorCompositeNode
+	for _, member := range n.owner.children {
+		if member.span.parent == n.span.parent {
+			result = append(result, member)
+		}
+	}
+	return result
+}
+
+// DeleteCompositeObjects 删除内部成员，保留容器、未选对象及其他实例，一次撤销恢复全部
+// 入参: page 页面索引, path 父复合路径, indexes 成员序号
+// 返回: error 错误信息
+func (e *Editor) DeleteCompositeObjects(page int, path ObjectPath, indexes []int) error {
+	return e.editCompositeObjects(page, path, indexes, func(_ *Renderer, nodes []*editorCompositeNode, _ []CompositeMember) error {
+		for _, node := range nodes {
+			node.owner.patches = append(node.owner.patches, editorXMLPatch{node.span.start, node.span.end, nil})
+		}
+		return nil
+	})
+}
+
+// CopyCompositeObjects 在原容器末尾复制选区并按页面毫米平移，保留原文并重映射副本内部标识
+// 入参: page 页面索引, path 父复合路径, indexes 同一容器的成员序号, dx、dy 页面位移
+// 返回: []int 按绘制顺序排列的副本序号, error 错误信息
+func (e *Editor) CopyCompositeObjects(page int, path ObjectPath, indexes []int, dx, dy float64) ([]int, error) {
+	if !finite(dx) || !finite(dy) {
+		return nil, fmt.Errorf("copy requires finite offsets")
+	}
+	var result []int
+	err := e.editCompositeObjects(page, path, indexes, func(renderer *Renderer, nodes []*editorCompositeNode, members []CompositeMember) error {
+		container := nodes[0].span.parent
+		for i, node := range nodes {
+			if !members[i].Capabilities.Copy || node.span.parent != container {
+				return fmt.Errorf("copy requires editable members in the same container")
+			}
+		}
+		slices.SortFunc(nodes, func(a, b *editorCompositeNode) int { return a.index - b.index })
+		ids := make(map[string]string)
+		for _, node := range nodes {
+			if err := e.collectCompositeIDs(node.node, ids); err != nil {
+				return err
+			}
+		}
+		var data []byte
+		for _, node := range nodes {
+			copy := *node
+			if err := e.transformCompositeMember(renderer, &copy, TranslationMatrix(dx, dy)); err != nil {
+				return err
+			}
+			fragment, err := editorXMLRemapIDs(copy.data, copy.node, ids)
+			if err != nil {
+				return err
+			}
+			data = append(data, fragment...)
+		}
+		owner := nodes[0].owner
+		owner.patches = append(owner.patches, editorXMLPatch{container.close, container.close, data})
+		next := 0
+		for _, member := range owner.children {
+			if container.start < member.span.start && member.span.end <= container.close {
+				next = member.index + 1
+			}
+		}
+		for i := range nodes {
+			result = append(result, next+i)
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return result, nil
+}
+
+// OrderCompositeObjects 调整同一直接容器内的绘制顺序，不改变页块和其他实例
+// 入参: page 页面索引, path 父复合路径, indexes 成员序号, order 为up、down、top或bottom
+// 返回: []int 调整后的选区序号, error 错误信息
+func (e *Editor) OrderCompositeObjects(page int, path ObjectPath, indexes []int, order string) ([]int, error) {
+	if !slices.Contains([]string{"up", "down", "top", "bottom"}, order) {
+		return nil, fmt.Errorf("invalid object order %q", order)
+	}
+	var result []int
+	err := e.editCompositeObjects(page, path, indexes, func(_ *Renderer, nodes []*editorCompositeNode, members []CompositeMember) error {
+		siblings := nodes[0].siblings()
+		selected := make([]bool, len(siblings))
+		for j, node := range nodes {
+			i := slices.Index(siblings, node)
+			if i < 0 || !members[j].Capabilities.Order {
+				return fmt.Errorf("ordering requires members in the same container")
+			}
+			selected[i] = true
+		}
+		ordered := slices.Clone(siblings)
+		orderEditorObjects(ordered, selected, order)
+		for i, node := range siblings {
+			if node != ordered[i] {
+				node.owner.patches = append(node.owner.patches, editorXMLPatch{node.span.start, node.span.end, ordered[i].data})
+			}
+			if slices.Contains(nodes, ordered[i]) {
+				result = append(result, node.index)
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return result, nil
+}
+
+// ReplaceCompositeImage 替换内部图片数据，保留变换、裁剪、蒙版、边框和透明度
+// 入参: page 页面索引, path 父复合路径, index 图片序号, data PNG或JPEG数据
+// 返回: error 错误信息
+func (e *Editor) ReplaceCompositeImage(page int, path ObjectPath, index int, data []byte) error {
+	return e.editCompositeObjects(page, path, []int{index}, func(_ *Renderer, nodes []*editorCompositeNode, _ []CompositeMember) error {
+		node := nodes[0]
+		if node.object.Type != "ImageObject" {
+			return fmt.Errorf("composite member is not an image")
+		}
+		object := node.object
+		id, err := e.AddImage(data)
+		if err != nil {
+			return err
+		}
+		object.ImageObject.ResourceID = id
+		return node.update(object)
+	})
+}
+
+// update 合并成员属性变化，不重写原文中未修改的字段
+// 入参: object 修改后的对象
+// 返回: error 错误信息
+func (n *editorCompositeNode) update(object GraphicObject) error {
+	data, err := editorXMLObject(n.data, n.node, n.object, object)
+	if err != nil || bytes.Equal(data, n.data) {
+		return err
+	}
+	next, err := newEditorCompositeNode(data)
+	if err != nil {
+		return err
+	}
+	n.data, n.node, n.object, n.changed = data, next.node, next.object, true
+	return nil
+}
+
+// collectCompositeIDs 为已校验副本中的标准标识分配新值，拒绝重复标识
+// 入参: node 原节点, ids 原标识与新标识
+// 返回: error 错误信息
+func (e *Editor) collectCompositeIDs(node *editorXML, ids map[string]string) error {
+	if id := editorResourceID(node.attr("ID")); id != "" {
+		if ids[id] != "" {
+			return fmt.Errorf("duplicate object ID %q", id)
+		}
+		ids[id] = e.nextID()
+	}
+	for _, child := range node.children {
+		if err := e.collectCompositeIDs(child, ids); err != nil {
+			return err
+		}
+	}
+	return nil
+}
diff --git a/ofdgo_editor_open.go b/ofdgo_editor_open.go
index 009a2ec..67d4056 100644
--- a/ofdgo_editor_open.go
+++ b/ofdgo_editor_open.go
@@ -62,11 +62,13 @@ type editorSourcePage struct {
 // Update表示完整替换内容，ReplaceFont表示可显式替换文字字体，Transform表示保留文字定位的几何变换，Order仅限同一图层或末级页块
 // Arrange表示可准确度量对齐与旋转范围；Reflow表示可重排文字，LayoutKnown表示段落选项可恢复
 // Paint表示可独立修改纯色填充和描边，不要求重新排版文字
+// ReplaceImage表示可替换图片数据，内部成员保留原布局，不开放裁剪或重新适应
 // MissingGlyphs提供缺字导致操作受限时的结构化诊断
 type ObjectCapabilities struct {
 	Update        bool
 	Paint         bool
 	ReplaceFont   bool
+	ReplaceImage  bool
 	Reflow        bool
 	LayoutKnown   bool
 	Transform     bool
@@ -355,6 +357,7 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 	all := ObjectCapabilities{Update: true, Paint: object.Type == "TextObject" || object.Type == "PathObject", ReplaceFont: object.Type == "TextObject", Reflow: object.Type == "TextObject" && object.TextObject.ReadDirection == 0 && object.TextObject.CharDirection == 0, LayoutKnown: object.Type == "TextObject" && (e.objectOrigin(id) == nil || object.TextObject.layout != nil), Transform: true, Arrange: true, Copy: true, Delete: true, Order: true}
 	origin := e.objectOrigin(id)
 	if origin == nil {
+		all.ReplaceImage = object.Type == "ImageObject"
 		return all, nil
 	}
 	node := origin.node
@@ -384,6 +387,7 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 		errors.As(err, &all.MissingGlyphs)
 	}
 	all.Paint = all.Paint && e.editorPaintable(object)
+	all.ReplaceImage = all.Update && object.Type == "ImageObject"
 	if object.Type == "ImageObject" && object.ImageObject.Border != nil && len(object.ImageObject.Actions) != 0 {
 		all.Transform, all.Arrange = false, false
 		all.Reason, all.ReasonCode = "image actions cannot be transformed together with the border", EditUnsupportedObject
@@ -425,6 +429,7 @@ func editorPreservedObject(before, after GraphicObject) bool {
 		a.ID, a.Boundary, a.CTM, a.Alpha = b.ID, b.Boundary, b.CTM, b.Alpha
 		a.Fill, a.Stroke, a.FillColor, a.StrokeColor, a.LineWidth = b.Fill, b.Stroke, b.FillColor, b.StrokeColor, b.LineWidth
 		a.DashOffset, a.DashPattern, a.Cap, a.Join = b.DashOffset, b.DashPattern, b.Cap, b.Join
+		a.dashPatternSet = b.dashPatternSet
 	case "ImageObject":
 		a, b := &before.ImageObject, after.ImageObject
 		a.ID, a.Boundary, a.CTM, a.Alpha = b.ID, b.Boundary, b.CTM, b.Alpha
diff --git a/ofdgo_editor_style.go b/ofdgo_editor_style.go
index 30d9f2f..96ecc27 100644
--- a/ofdgo_editor_style.go
+++ b/ofdgo_editor_style.go
@@ -90,11 +90,12 @@ func (e *Editor) resolveEditorStyleDefaults(object GraphicObject, base *DrawPara
 	if object.Type == "PathObject" {
 		obj := &object.PathObject
 		style = mergeDrawParam(*style, &DrawParam{LineWidth: obj.LineWidth, Join: obj.Join, Cap: obj.Cap,
-			MiterLimit: obj.MiterLimit, DashPattern: obj.DashPattern, DashOffset: obj.DashOffset,
+			MiterLimit: obj.MiterLimit, DashPattern: obj.DashPattern, dashPatternSet: obj.dashPatternSet, DashOffset: obj.DashOffset,
 			FillColor: obj.FillColor, StrokeColor: obj.StrokeColor})
 		obj.DrawParam = ""
 		obj.LineWidth, obj.Join, obj.Cap = style.LineWidth, style.Join, style.Cap
 		obj.MiterLimit, obj.DashPattern, obj.DashOffset = style.MiterLimit, style.DashPattern, style.DashOffset
+		obj.dashPatternSet = style.dashPatternSet
 		obj.FillColor, obj.StrokeColor = style.FillColor, style.StrokeColor
 	} else {
 		obj := &object.TextObject
@@ -221,6 +222,7 @@ func (e *Editor) styleObject(object GraphicObject, style ObjectStyle) (GraphicOb
 		}
 		if style.DashPattern != nil {
 			path.DashPattern = *style.DashPattern
+			path.dashPatternSet = path.DashPattern == ""
 		}
 		if style.DashOffset != nil {
 			path.DashOffset = style.DashOffset
@@ -316,6 +318,7 @@ func (e *Editor) CopyStyle(page int, ids []string, source GraphicObject) error {
 			to.FillColor, to.StrokeColor = from.FillColor, from.StrokeColor
 			to.LineWidth, to.Cap, to.Join, to.MiterLimit = from.LineWidth, from.Cap, from.Join, from.MiterLimit
 			to.DashPattern, to.DashOffset = from.DashPattern, from.DashOffset
+			to.dashPatternSet = from.dashPatternSet
 			scale := editorStrokeScale(from.CTM) / editorStrokeScale(to.CTM)
 			if scale != 1 {
 				if to.LineWidth == 0 {
diff --git a/ofdgo_editor_xml.go b/ofdgo_editor_xml.go
index 69bed25..1d9cd6c 100644
--- a/ofdgo_editor_xml.go
+++ b/ofdgo_editor_xml.go
@@ -104,6 +104,13 @@ func (n *editorXML) attr(name string) string {
 	return ""
 }
 
+// hasAttr 判断属性是否存在，区分空值与省略
+// 入参: name 属性名称
+// 返回: bool 是否存在
+func (n *editorXML) hasAttr(name string) bool {
+	return slices.ContainsFunc(n.attrs, func(attr xml.Attr) bool { return attr.Name.Space == "" && attr.Name.Local == name })
+}
+
 // editorPatchXML 按位置应用互不重叠的替换
 // 入参: data 原文, patches 修改区间
 // 返回: []byte 修改后的XML
@@ -363,7 +370,7 @@ func editorXMLMerge(data []byte, node *editorXML, oldXML, newXML []byte) ([]byte
 	}
 	changes := make(map[string]string)
 	for _, attr := range append(oldNode.attrs, newNode.attrs...) {
-		if attr.Name.Space == "" && oldNode.attr(attr.Name.Local) != newNode.attr(attr.Name.Local) {
+		if attr.Name.Space == "" && (oldNode.attr(attr.Name.Local) != newNode.attr(attr.Name.Local) || oldNode.hasAttr(attr.Name.Local) != newNode.hasAttr(attr.Name.Local)) {
 			changes[attr.Name.Local] = newNode.attr(attr.Name.Local)
 		}
 	}
@@ -388,7 +395,7 @@ func editorXMLMerge(data []byte, node *editorXML, oldXML, newXML []byte) ([]byte
 			if value, ok := changes[attr.Name.Local]; ok {
 				attr.Value = value
 				delete(changes, attr.Name.Local)
-				if value == "" {
+				if !newNode.hasAttr(attr.Name.Local) {
 					continue
 				}
 			}
@@ -402,7 +409,7 @@ func editorXMLMerge(data []byte, node *editorXML, oldXML, newXML []byte) ([]byte
 		result.WriteByte('"')
 	}
 	for _, attr := range newNode.attrs {
-		if value, ok := changes[attr.Name.Local]; ok && value != "" {
+		if value, ok := changes[attr.Name.Local]; ok {
 			result.WriteString(" " + attr.Name.Local + "=\"")
 			_ = xml.EscapeText(&result, []byte(value))
 			result.WriteByte('"')
diff --git a/ofdgo_object.go b/ofdgo_object.go
index 2b87217..4da0162 100644
--- a/ofdgo_object.go
+++ b/ofdgo_object.go
@@ -19,6 +19,46 @@ import (
 	"strconv"
 )
 
+// UnmarshalXML 解析路径并区分省略的虚线样式与显式实线
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (p *PathObject) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type plain PathObject
+	var value struct {
+		plain
+		DashPattern *string `xml:"DashPattern,attr"`
+	}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*p = PathObject(value.plain)
+	if value.DashPattern != nil {
+		p.DashPattern = *value.DashPattern
+		p.dashPatternSet = p.DashPattern == ""
+	}
+	return nil
+}
+
+// UnmarshalXML 解析绘制参数并保留显式实线对基础参数的覆盖
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (p *DrawParam) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type plain DrawParam
+	var value struct {
+		plain
+		DashPattern *string `xml:"DashPattern,attr"`
+	}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*p = DrawParam(value.plain)
+	if value.DashPattern != nil {
+		p.DashPattern = *value.DashPattern
+		p.dashPatternSet = p.DashPattern == ""
+	}
+	return nil
+}
+
 // UnmarshalXML 解析填充颜色并区分未支持的复杂颜色
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
diff --git a/ofdgo_page.go b/ofdgo_page.go
index e96f2dd..a512b2c 100644
--- a/ofdgo_page.go
+++ b/ofdgo_page.go
@@ -164,14 +164,15 @@ type CGTransform struct {
 
 // PathObject 路径对象
 type PathObject struct {
-	ID              string       `xml:"ID,attr"`
-	Boundary        string       `xml:"Boundary,attr"`
-	DrawParam       string       `xml:"DrawParam,attr"`
-	LineWidth       float64      `xml:"LineWidth,attr"`
-	Join            string       `xml:"Join,attr"`
-	Cap             string       `xml:"Cap,attr"`
-	DashOffset      *float64     `xml:"DashOffset,attr"`
-	DashPattern     string       `xml:"DashPattern,attr"`
+	ID              string   `xml:"ID,attr"`
+	Boundary        string   `xml:"Boundary,attr"`
+	DrawParam       string   `xml:"DrawParam,attr"`
+	LineWidth       float64  `xml:"LineWidth,attr"`
+	Join            string   `xml:"Join,attr"`
+	Cap             string   `xml:"Cap,attr"`
+	DashOffset      *float64 `xml:"DashOffset,attr"`
+	DashPattern     string   `xml:"DashPattern,attr"`
+	dashPatternSet  bool
 	MiterLimit      float64      `xml:"MiterLimit,attr"`
 	CTM             string       `xml:"CTM,attr"`
 	Alpha           *int         `xml:"Alpha,attr"`
diff --git a/ofdgo_renderer_layer.go b/ofdgo_renderer_layer.go
index 19629a2..53d2498 100644
--- a/ofdgo_renderer_layer.go
+++ b/ofdgo_renderer_layer.go
@@ -249,8 +249,9 @@ func mergeDrawParam(base DrawParam, dp *DrawParam) *DrawParam {
 	if dp.Cap != "" {
 		base.Cap = dp.Cap
 	}
-	if dp.DashPattern != "" {
+	if dp.DashPattern != "" || dp.dashPatternSet {
 		base.DashPattern = dp.DashPattern
+		base.dashPatternSet = dp.dashPatternSet
 	}
 	if dp.DashOffset != nil {
 		base.DashOffset = dp.DashOffset
diff --git a/ofdgo_renderer_path.go b/ofdgo_renderer_path.go
index 1349fc5..f8b43c1 100644
--- a/ofdgo_renderer_path.go
+++ b/ofdgo_renderer_path.go
@@ -126,7 +126,7 @@ func (s *pathStyle) applyDrawParam(r *Renderer, dp *DrawParam, bx, by, pageH flo
 		s.lineCap = pathLineCap(dp.Cap, s.lineCap)
 	}
 	s.applyLineJoin(dp.Join, dp.MiterLimit)
-	if dp.DashPattern != "" {
+	if dp.DashPattern != "" || dp.dashPatternSet {
 		s.dashPattern = parseFloats(dp.DashPattern)
 	}
 	if dp.DashOffset != nil {
@@ -150,7 +150,7 @@ func (s *pathStyle) applyPathObject(r *Renderer, obj PathObject, bx, by, pageH f
 		s.lineCap = pathLineCap(obj.Cap, canvas.ButtCap)
 	}
 	s.applyLineJoin(obj.Join, obj.MiterLimit)
-	if obj.DashPattern != "" {
+	if obj.DashPattern != "" || obj.dashPatternSet {
 		s.dashPattern = parseFloats(obj.DashPattern)
 	}
 	if obj.DashOffset != nil {
diff --git a/ofdgo_res.go b/ofdgo_res.go
index fbe8287..76cd574 100644
--- a/ofdgo_res.go
+++ b/ofdgo_res.go
@@ -78,23 +78,24 @@ type DrawParams struct {
 
 // DrawParam 绘制参数
 type DrawParam struct {
-	ID          string       `xml:"ID,attr"`
-	Relative    string       `xml:"Relative,attr"`
-	ResourceID  string       `xml:"ResourceID,attr"`
-	BaseLoc     string       `xml:"BaseLoc,attr"`
-	Link        string       `xml:"Link,attr"`
-	LineWidth   float64      `xml:"LineWidth,attr"`
-	Join        string       `xml:"Join,attr"`
-	Cap         string       `xml:"Cap,attr"`
-	DashOffset  *float64     `xml:"DashOffset,attr"`
-	DashPattern string       `xml:"DashPattern,attr"`
-	MiterLimit  float64      `xml:"MiterLimit,attr"`
-	Font        string       `xml:"Font,attr"`
-	Size        float64      `xml:"Size,attr"`
-	Weight      int          `xml:"Weight,attr"`
-	Italic      bool         `xml:"Italic,attr"`
-	FillColor   *FillColor   `xml:"FillColor"`
-	StrokeColor *StrokeColor `xml:"StrokeColor"`
+	ID             string   `xml:"ID,attr"`
+	Relative       string   `xml:"Relative,attr"`
+	ResourceID     string   `xml:"ResourceID,attr"`
+	BaseLoc        string   `xml:"BaseLoc,attr"`
+	Link           string   `xml:"Link,attr"`
+	LineWidth      float64  `xml:"LineWidth,attr"`
+	Join           string   `xml:"Join,attr"`
+	Cap            string   `xml:"Cap,attr"`
+	DashOffset     *float64 `xml:"DashOffset,attr"`
+	DashPattern    string   `xml:"DashPattern,attr"`
+	dashPatternSet bool
+	MiterLimit     float64      `xml:"MiterLimit,attr"`
+	Font           string       `xml:"Font,attr"`
+	Size           float64      `xml:"Size,attr"`
+	Weight         int          `xml:"Weight,attr"`
+	Italic         bool         `xml:"Italic,attr"`
+	FillColor      *FillColor   `xml:"FillColor"`
+	StrokeColor    *StrokeColor `xml:"StrokeColor"`
 }
 
 // CompositeGraphicUnits 复合图元集合
diff --git a/ofdgo_writer.go b/ofdgo_writer.go
index 400af64..2da5d78 100644
--- a/ofdgo_writer.go
+++ b/ofdgo_writer.go
@@ -637,7 +637,11 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 		attrs.add("Join", obj.Join)
 		attrs.add("Cap", obj.Cap)
 		attrs.add("Rule", obj.Rule)
-		attrs.add("DashPattern", obj.DashPattern)
+		if obj.dashPatternSet {
+			attrs = append(attrs, xml.Attr{Name: xml.Name{Local: "DashPattern"}, Value: obj.DashPattern})
+		} else {
+			attrs.add("DashPattern", obj.DashPattern)
+		}
 		if obj.DashOffset != nil {
 			attrs.add("DashOffset", ofdNumber(*obj.DashOffset))
 		}