feat(电子发票): 完善发票识别并统一命名空间

assets/webui/ofdgo.js

@@ -5857,7 +5857,6 @@ async function newInvoiceDraft() {
 
 function renderInvoiceBasic(container, draft) {
 	const fields = (draft.detail.fields || []).filter(field => field.item < 0 && !field.field.startsWith("facts.") && !field.field.startsWith("items."));
-	const standards = {"http://www.edrm.org.cn/schema/e-invoice/2019": "电子发票/2019", "http://www.ofdspec.org/2016": "发票标引"};
 	const labels = {
 		kind: "票种", standard: "规范", version: "版本", number: "号码", code: "代码", date: "日期",
 		currency: "币种", status: "状态", amount: "金额", taxAmount: "税额", totalAmount: "合计", remarks: "备注",
@@ -5871,7 +5870,7 @@ function renderInvoiceBasic(container, draft) {
 		container.append(title, grid);
 		for (const field of fields.filter(field => field.group === group)) {
 			const value = invoiceValue(draft.invoice, field.field);
-			const display = field.field === "standard" ? standards[value] || value : value;
+			const display = field.field === "standard" ? draft.detail.standardLabel || value : value;
 			invoiceInput(grid, labels[field.field.split(".").at(-1)] || field.label, `Field_${field.field.replaceAll(".", "_")}`, display, value => {
 				invoiceSetValue(draft.invoice, field.field, -1, value);
 				invoiceDirty(draft, "model");

internal/webui/wasm.go

@@ -1004,6 +1004,13 @@ func documentInvoice(args []js.Value) (any, error) {
 		return nil, fmt.Errorf("invoice index out of range")
 	}
 	value := report.Invoices[request.Index]
+	standardLabel := value.Standard
+	switch value.Standard {
+	case ofdgo.InvoiceStandardEDRM2019:
+		standardLabel = "电子发票/2019"
+	case ofdgo.InvoiceStandardObjectReference:
+		standardLabel = "发票标引"
+	}
 	capabilities, err := r.InvoiceCapabilities(ctx, request.Source, request.Index)
 	if err != nil {
 		return nil, err
@@ -1012,7 +1019,7 @@ func documentInvoice(args []js.Value) (any, error) {
 	if bindingErr != nil {
 		report.Issues = append(report.Issues, ofdgo.InvoiceIssue{Code: "binding-error", Message: bindingErr.Error(), Source: request.Source})
 	}
-	return map[string]any{"invoice": value, "fields": ofdgo.InvoiceFields(value), "capabilities": capabilities, "bindings": bindings, "digest": ofdgo.InvoiceDigest(data), "xml": string(data), "issues": report.Issues}, nil
+	return map[string]any{"invoice": value, "standardLabel": standardLabel, "fields": ofdgo.InvoiceFields(value), "capabilities": capabilities, "bindings": bindings, "digest": ofdgo.InvoiceDigest(data), "xml": string(data), "issues": report.Issues}, nil
 }
 
 // exportDocumentInvoice 导出发票原文

ofdgo_editor_invoice.go

@@ -992,7 +992,7 @@ func invoicePayloadSignature(ctx context.Context, data []byte) (bool, error) {
 		}
 		node := nodes[len(nodes)-1]
 		nodes = nodes[:len(nodes)-1]
-		if node.name.Space == "http://www.w3.org/2000/09/xmldsig#" && node.name.Local == "Signature" || root.name.Space == "" && root.name.Local == "EInvoice" && node.parent == root && node.name.Space == "" && node.name.Local == "TaxBureauSignature" {
+		if node.name.Space == invoiceXMLSignature && node.name.Local == "Signature" || root.name.Space == "" && root.name.Local == "EInvoice" && node.parent == root && node.name.Space == "" && node.name.Local == "TaxBureauSignature" {
 			return true, nil
 		}
 		nodes = append(nodes, node.children...)

ofdgo_invoice_source.go

@@ -34,7 +34,7 @@ func InvoiceDigest(data []byte) string {
 	return hex.EncodeToString(sum[:])
 }
 
-// ReadInvoice 读取当前文档及版本声明的发票，标引按对象引用提取文本
+// ReadInvoice 读取当前文档及版本声明的发票，字段路径相对导出XML，标引按对象引用提取文本
 // 入参: ctx 取消上下文, source 精确来源
 // 返回: InvoiceReport 发票及诊断, error 来源或读取错误
 func (r *Reader) ReadInvoice(ctx context.Context, source InvoiceSource) (InvoiceReport, error) {
@@ -43,7 +43,12 @@ func (r *Reader) ReadInvoice(ctx context.Context, source InvoiceSource) (Invoice
 	if err != nil {
 		return InvoiceReport{}, err
 	}
-	report, err := r.readInvoiceXML(ctx, data, source)
+	local := source
+	local.NodePath = ""
+	report, err := r.readInvoiceXML(ctx, data, local)
+	for i := range report.Invoices {
+		report.Invoices[i].Sources = []InvoiceSource{source}
+	}
 	report.DocumentIndex = r.DocumentIndex()
 	if r.versionInfo != nil {
 		report.Version = r.versionInfo.ID
@@ -64,6 +69,9 @@ func (r *Reader) readInvoiceXML(ctx context.Context, data []byte, source Invoice
 		return report, err
 	}
 	if root.name.Space != ofdNamespace2016 || root.name.Local != "root" || !invoiceObjectReferences(root) {
+		if root.name.Local != "eInvoice" && root.name.Local != "EInvoice" && root.name.Local != "xbrl" {
+			return InvoiceReport{}, nil
+		}
 		return report, nil
 	}
 	structure, err := parseStructure(ctx, data, CustomTag{TypeID: structureTypeOfficial, NameSpace: ofdNamespace2016})

ofdgo_invoice_write.go

@@ -117,7 +117,7 @@ type invoiceXMLPatch struct {
 func InvoiceFields(value Invoice) []InvoiceFieldDescriptor {
 	format, supported := invoiceWriteFormat(value)
 	probe := Invoice{Items: []InvoiceItem{{}}}
-	if value.Standard == "EInvoice" {
+	if value.Standard == InvoiceStandardEInvoice {
 		probe.Number, probe.Date = "editable", "editable"
 		for _, group := range invoicePlainGroups() {
 			for _, name := range strings.Fields(group.value) {
@@ -171,7 +171,7 @@ func InvoiceFields(value Invoice) []InvoiceFieldDescriptor {
 		case "amount", "taxAmount", "totalAmount", "items.quantity", "items.unitPrice", "items.amount", "items.taxAmount":
 			d.Type = "decimal"
 		case "items.taxRate":
-			if value.Standard == "EInvoice" {
+			if value.Standard == InvoiceStandardEInvoice {
 				d.Type = "decimal"
 			}
 		}
@@ -208,13 +208,14 @@ func InvoiceFields(value Invoice) []InvoiceFieldDescriptor {
 // InvoiceFormats 返回独立格式能力副本，创建及编辑能力按业务版本分别声明
 // 返回: 已适配格式列表
 func InvoiceFormats() []InvoiceFormat {
-	result := []InvoiceFormat{{Kind: "einv", Standard: "EInvoice", Version: "0.3", Read: true, Create: true, Edit: true, Items: true}}
+	result := []InvoiceFormat{{Kind: "einv", Standard: InvoiceStandardEInvoice, Version: "0.3", Read: true, Create: true, Edit: true, Items: true}}
 	result = append(result, InvoiceFormat{Kind: "inv", Standard: invoiceEDRM, Version: "1.0", Read: true, Items: true})
 	result = append(result, InvoiceFormat{Kind: "inv", Standard: ofdNamespace2016, Version: "1.0", Read: true})
-	for _, kind := range []string{"inv", "einv", "atr", "rai"} {
+	for _, standard := range []string{InvoiceStandardVAT2023, InvoiceStandardDigital2023, InvoiceStandardAir2023, InvoiceStandardRail2023} {
-		result = append(result, InvoiceFormat{Kind: kind, Standard: "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/" + kind, Version: "2023-12-31", Read: true, Create: true, Edit: true, Items: kind == "inv" || kind == "atr"})
+		kind, version := invoiceTaxonomy(standard)
+		result = append(result, InvoiceFormat{Kind: kind, Standard: standard, Version: version, Read: true, Create: true, Edit: true, Items: kind == "inv" || kind == "atr"})
 	}
-	return append(result, InvoiceFormat{Kind: "atr", Standard: "http://xbrl.mof.gov.cn/taxonomy/2021-11-30/atr", Version: "2021-11-30", Read: true, Edit: true, Items: true})
+	return append(result, InvoiceFormat{Kind: "atr", Standard: InvoiceStandardAir2021, Version: "2021-11-30", Read: true, Edit: true, Items: true}, InvoiceFormat{Kind: "inv", Standard: InvoiceStandardVAT2021, Version: "2021-09-30", Read: true, Items: true})
 }
 
 // DecodeInvoices 提取独立XML或XBRL中的发票，不执行联网或完整XSD验证
@@ -280,7 +281,7 @@ func ValidateInvoice(ctx context.Context, value Invoice) ([]InvoiceIssue, error)
 			add("invalid-date", "Date", "invalid invoice date")
 		}
 	}
-	if value.Currency != "" && !invoiceCurrencyUnit("{http://www.xbrl.org/2003/iso4217}"+value.Currency) {
+	if value.Currency != "" && !invoiceCurrencyUnit("{"+InvoiceCurrencyNamespace+"}"+value.Currency) {
 		add("invalid-value", "Currency", "invalid ISO currency code")
 	}
 	for _, field := range []invoiceWriteField{{"Amount", value.Amount}, {"TaxAmount", value.TaxAmount}, {"TotalAmount", value.TotalAmount}} {
@@ -303,11 +304,11 @@ func ValidateInvoice(ctx context.Context, value Invoice) ([]InvoiceIssue, error)
 				add("invalid-decimal", fmt.Sprintf("Items[%d].%s", i, field.name), "invalid decimal lexical value")
 			}
 		}
-		if value.Standard == "EInvoice" && item.TaxRate != "" && invoiceDecimal(item.TaxRate) == nil {
+		if value.Standard == InvoiceStandardEInvoice && item.TaxRate != "" && invoiceDecimal(item.TaxRate) == nil {
 			add("invalid-decimal", fmt.Sprintf("Items[%d].TaxRate", i), "invalid decimal lexical value")
 		}
 	}
-	if value.Kind == "inv" || value.Standard == "EInvoice" {
+	if value.Kind == "inv" || value.Standard == InvoiceStandardEInvoice {
 		for _, total := range []invoiceWriteField{{"Amount", value.Amount}, {"TaxAmount", value.TaxAmount}} {
 			sum := new(big.Rat)
 			complete := len(value.Items) > 0
@@ -459,7 +460,7 @@ func EncodeInvoiceWithOptions(ctx context.Context, value Invoice, options Invoic
 		return nil, err
 	}
 	var data []byte
-	if value.Standard == "EInvoice" {
+	if value.Standard == InvoiceStandardEInvoice {
 		data, err = invoiceEncodePlain(value)
 		if err == nil {
 			data, err = invoiceWritePlainSections(ctx, data, options)
@@ -621,7 +622,7 @@ func invoiceEncodeXBRL(value Invoice, options InvoiceEncodingOptions) ([]byte, e
 	}
 	var b strings.Builder
 	b.WriteString(xml.Header)
-	fmt.Fprintf(&b, `<xbrli:xbrl xmlns:xbrli="%s" xmlns:xsi="%s" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:f="%s" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink">`, invoiceXBRL, invoiceXSI, value.Standard)
+	fmt.Fprintf(&b, `<xbrli:xbrl xmlns:xbrli="%s" xmlns:xsi="%s" xmlns:iso4217="%s" xmlns:f="%s" xmlns:link="%s" xmlns:xlink="%s">`, invoiceXBRL, invoiceXSI, InvoiceCurrencyNamespace, value.Standard, invoiceLinkbase, invoiceXLink)
 	fmt.Fprintf(&b, `<link:schemaRef xlink:type="simple" xlink:href="%s"/><xbrli:context id="%s"><xbrli:entity><xbrli:identifier scheme="%s">%s</xbrli:identifier></xbrli:entity><xbrli:period>`, invoiceWriteEscape(options.SchemaRef), options.Context.ID, invoiceWriteEscape(options.Context.Scheme), invoiceWriteEscape(options.Context.Identifier))
 	if options.Context.Instant != "" {
 		if options.Context.StartDate != "" || options.Context.EndDate != "" {
@@ -722,7 +723,7 @@ func invoiceWriteFact(b *strings.Builder, value Invoice, fact InvoiceFact, optio
 	if numeric {
 		unit := ""
 		for _, u := range options.Units {
-			match := u.Namespace == "http://www.xbrl.org/2003/iso4217" && u.Name == value.Currency
+			match := u.Namespace == InvoiceCurrencyNamespace && u.Name == value.Currency
 			if !invoiceMonetary(value.Kind, fact.Name) {
 				match = u.Namespace == invoiceXBRL && u.Name == "pure"
 				if fact.Unit != "" {
@@ -1215,7 +1216,7 @@ func UpdateInvoiceXML(ctx context.Context, data []byte, invoiceIndex int, value
 	if err != nil {
 		return nil, err
 	}
-	if value.Standard == "EInvoice" {
+	if value.Standard == InvoiceStandardEInvoice {
 		var expanded []invoiceXMLPatch
 		for _, s := range spans {
 			n := s.node
@@ -1251,7 +1252,7 @@ func UpdateInvoiceXML(ctx context.Context, data []byte, invoiceIndex int, value
 	clean.Facts = nil
 	clean.Sources = nil
 	clean.Items = append([]InvoiceItem(nil), value.Items...)
-	if clean.Standard != "EInvoice" {
+	if clean.Standard != InvoiceStandardEInvoice {
 		for _, name := range invoiceWriteHeader(clean) {
 			previous := invoiceXMLField(&old, old.Kind, name)
 			target := invoiceXMLField(&clean, clean.Kind, name)
@@ -1262,7 +1263,7 @@ func UpdateInvoiceXML(ctx context.Context, data []byte, invoiceIndex int, value
 	}
 	for i := range clean.Items {
 		clean.Items[i].Fields = nil
-		if value.Standard != "EInvoice" && (value.Kind == "atr" || value.Kind == "inv") {
+		if value.Standard != InvoiceStandardEInvoice && (value.Kind == "atr" || value.Kind == "inv") {
 			for _, f := range value.Items[i].Fields {
 				if !invoiceWriteContains(invoiceWriteItemNames(value.Kind), f.Name) {
 					continue
@@ -1291,7 +1292,7 @@ func UpdateInvoiceXML(ctx context.Context, data []byte, invoiceIndex int, value
 		}
 	}
 	var generated []byte
-	if value.Standard == "EInvoice" {
+	if value.Standard == InvoiceStandardEInvoice {
 		generated, err = invoiceEncodePlain(clean)
 	} else {
 		options, e := invoiceWriteOriginalOptions(root, old)
@@ -1310,7 +1311,7 @@ func UpdateInvoiceXML(ctx context.Context, data []byte, invoiceIndex int, value
 	var patches []invoiceXMLPatch
 	var trailingGroups []invoiceXMLPatch
 	var itemParent, generatedParent *invoiceXMLNode
-	if value.Standard == "EInvoice" {
+	if value.Standard == InvoiceStandardEInvoice {
 		if len(invoiceChildren(root, "", "EInvoiceData")) != 1 || len(invoiceChildren(root, "", "TaxSupervisionInfo")) != 1 {
 			return nil, fmt.Errorf("invoice requires unique data and supervision groups")
 		}
@@ -1425,7 +1426,7 @@ func UpdateInvoiceXML(ctx context.Context, data []byte, invoiceIndex int, value
 	var matches []Invoice
 	for _, inv := range after.Invoices {
 		if inv.Kind == value.Kind && inv.Standard == value.Standard {
-			if value.Standard == "EInvoice" {
+			if value.Standard == InvoiceStandardEInvoice {
 				matches = append(matches, inv)
 				continue
 			}
@@ -1503,8 +1504,8 @@ func invoiceWriteOriginalOptions(root *invoiceXMLNode, value Invoice) (InvoiceEn
 		}
 	}
 	for _, n := range root.children {
-		if n.name == (xml.Name{Space: "http://www.xbrl.org/2003/linkbase", Local: "schemaRef"}) && options.SchemaRef == "" {
+		if n.name == (xml.Name{Space: invoiceLinkbase, Local: "schemaRef"}) && options.SchemaRef == "" {
-			options.SchemaRef = invoiceXMLAttr(n, "http://www.w3.org/1999/xlink", "href")
+			options.SchemaRef = invoiceXMLAttr(n, invoiceXLink, "href")
 		}
 		if n.name == (xml.Name{Space: invoiceXBRL, Local: "context"}) && invoiceXMLAttr(n, "", "id") == ref {
 			dims, ok := invoiceContext(n)
@@ -1684,7 +1685,7 @@ func invoiceWriteMergeItems(ctx context.Context, data []byte, spans map[string]i
 	}
 	space, name := value.Standard, invoiceWriteTuple(value.Kind)
 	names := invoiceWriteItemNames(value.Kind)
-	if value.Standard == "EInvoice" {
+	if value.Standard == InvoiceStandardEInvoice {
 		space = ""
 		name = "IssuItemInformation"
 		names = strings.Fields("ItemName SpecMod MeaUnits Quantity UnPrice Amount TaxRate ComTaxAm")
@@ -1731,7 +1732,7 @@ func invoiceWriteMergeItems(ctx context.Context, data []byte, spans map[string]i
 		if path == "" {
 			for _, f := range item.Fields {
 				mapped := invoiceItemField(&InvoiceItem{}, value.Kind, f.Name)
-				if value.Standard == "EInvoice" || !invoiceWriteContains(names, f.Name) {
+				if value.Standard == InvoiceStandardEInvoice || !invoiceWriteContains(names, f.Name) {
 					return nil, fmt.Errorf("unsupported new invoice item fact %s", f.Name)
 				}
 				if mapped != nil {
@@ -1793,7 +1794,7 @@ func invoiceWriteMergeItems(ctx context.Context, data []byte, spans map[string]i
 	if len(ordered) == 0 && len(combined) > 0 {
 		var p invoiceXMLPatch
 		var err error
-		if value.Standard == "EInvoice" {
+		if value.Standard == InvoiceStandardEInvoice {
 			p, err = invoiceWriteOrderedInsert(data, spans, parent, "", name, strings.Fields("SellerInformation BuyerInformation BasicInformation IssuItemInformation SpecificInformation AdditionalInformation"), combined)
 		} else {
 			p, err = invoiceWriteInsert(spans[parent.path], combined, data)
@@ -1837,7 +1838,7 @@ func invoiceWriteOrderedInsert(data []byte, spans map[string]invoiceXMLSpan, par
 // 入参: value 发票
 // 返回: 缺少元组字段错误
 func invoiceWriteCreation(value Invoice) error {
-	if value.Standard == "EInvoice" {
+	if value.Standard == InvoiceStandardEInvoice {
 		return nil
 	}
 	for i, item := range value.Items {

ofdgo_invoice_xml.go

@@ -28,14 +28,59 @@ import (
 	"time"
 )
 
-// invoiceXBRL 表示XBRL实例命名空间
+// invoiceXMLNamespace 表示XML预定义命名空间
-const invoiceXBRL = "http://www.xbrl.org/2003/instance"
+const invoiceXMLNamespace = "http://www.w3.org/XML/1998/namespace"
 
 // invoiceXSI 表示XMLSchema实例命名空间
 const invoiceXSI = "http://www.w3.org/2001/XMLSchema-instance"
 
+// invoiceXLink 表示XML链接命名空间
+const invoiceXLink = "http://www.w3.org/1999/xlink"
+
+// invoiceXMLSignature 表示XML数字签名命名空间
+const invoiceXMLSignature = "http://www.w3.org/2000/09/xmldsig#"
+
+// invoiceXBRL 表示XBRL实例命名空间
+const invoiceXBRL = "http://www.xbrl.org/2003/instance"
+
+// invoiceLinkbase 表示XBRL链接库命名空间
+const invoiceLinkbase = "http://www.xbrl.org/2003/linkbase"
+
+// invoiceDimension 表示XBRL实例维度命名空间
+const invoiceDimension = "http://xbrl.org/2006/xbrldi"
+
+// InvoiceCurrencyNamespace 表示InvoiceUnit中ISO货币度量使用的命名空间
+const InvoiceCurrencyNamespace = "http://www.xbrl.org/2003/iso4217"
+
+// InvoiceStandardVAT2023 表示2023版增值税发票分类标准
+const InvoiceStandardVAT2023 = "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/inv"
+
+// InvoiceStandardDigital2023 表示2023版数字化电子发票分类标准
+const InvoiceStandardDigital2023 = "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/einv"
+
+// InvoiceStandardAir2023 表示2023版航空运输电子客票行程单分类标准
+const InvoiceStandardAir2023 = "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/atr"
+
+// InvoiceStandardRail2023 表示2023版铁路电子客票分类标准
+const InvoiceStandardRail2023 = "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/rai"
+
+// InvoiceStandardVAT2021 表示2021版增值税发票分类标准，仅支持读取
+const InvoiceStandardVAT2021 = "http://xbrl.mof.gov.cn/taxonomy/2021-09-30/inv"
+
+// InvoiceStandardAir2021 表示2021版航空运输电子客票行程单分类标准
+const InvoiceStandardAir2021 = "http://xbrl.mof.gov.cn/taxonomy/2021-11-30/atr"
+
+// InvoiceStandardEInvoice 表示无命名空间的EInvoice业务标准，版本由Invoice.Version指定
+const InvoiceStandardEInvoice = "EInvoice"
+
+// InvoiceStandardObjectReference 表示基于OFD对象引用的只读发票标引
+const InvoiceStandardObjectReference = ofdNamespace2016
+
+// InvoiceStandardEDRM2019 表示2019版电子发票业务标准
+const InvoiceStandardEDRM2019 = "http://www.edrm.org.cn/schema/e-invoice/2019"
+
 // invoiceEDRM 表示2019版电子发票业务命名空间
-const invoiceEDRM = "http://www.edrm.org.cn/schema/e-invoice/2019"
+const invoiceEDRM = InvoiceStandardEDRM2019
 
 // invoiceDecimalPattern 仅接受XML十进制词法
 var invoiceDecimalPattern = regexp.MustCompile(`^[+-]?(?:[0-9]+(?:\.[0-9]*)?|\.[0-9]+)$`)
@@ -150,7 +195,7 @@ func invoiceXMLTree(ctx context.Context, data []byte) (*invoiceXMLNode, error) {
 					return nil, fmt.Errorf("invoice XML exceeds namespace URI limit")
 				}
 			}
-			n := &invoiceXMLNode{name: v.Name, attrs: v.Attr, parent: current, ns: map[string]string{"xml": "http://www.w3.org/XML/1998/namespace"}, counts: map[xml.Name]int{}, start: d.InputOffset()}
+			n := &invoiceXMLNode{name: v.Name, attrs: v.Attr, parent: current, ns: map[string]string{"xml": invoiceXMLNamespace}, counts: map[xml.Name]int{}, start: d.InputOffset()}
 			index := 1
 			if current != nil {
 				for k, v := range current.ns {
@@ -223,16 +268,18 @@ func invoiceXMLTree(ctx context.Context, data []byte) (*invoiceXMLNode, error) {
 // 返回: 票种及版本，未知时为空
 func invoiceTaxonomy(ns string) (string, string) {
 	switch ns {
-	case "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/inv":
+	case InvoiceStandardVAT2023:
 		return "inv", "2023-12-31"
-	case "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/einv":
+	case InvoiceStandardDigital2023:
 		return "einv", "2023-12-31"
-	case "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/atr":
+	case InvoiceStandardAir2023:
 		return "atr", "2023-12-31"
-	case "http://xbrl.mof.gov.cn/taxonomy/2023-12-31/rai":
+	case InvoiceStandardRail2023:
 		return "rai", "2023-12-31"
-	case "http://xbrl.mof.gov.cn/taxonomy/2021-11-30/atr":
+	case InvoiceStandardAir2021:
 		return "atr", "2021-11-30"
+	case InvoiceStandardVAT2021:
+		return "inv", "2021-09-30"
 	}
 	return "", ""
 }
@@ -351,7 +398,7 @@ func parseInvoiceXML(ctx context.Context, data []byte, source InvoiceSource) (In
 		if err := ctx.Err(); err != nil {
 			return err
 		}
-		if n.name.Space == invoiceXBRL || n.name.Space == "http://www.xbrl.org/2003/linkbase" {
+		if n.name.Space == invoiceXBRL || n.name.Space == invoiceLinkbase {
 			return nil
 		}
 		if len(n.children) > 0 && invoiceXMLAttr(n, "", "contextRef") == "" {
@@ -421,7 +468,7 @@ func parseInvoiceXML(ctx context.Context, data []byte, source InvoiceSource) (In
 			return nil
 		}
 		if numeric && invoiceMonetary(kind, fact.Name) && invoiceCurrencyUnit(unitValues[fact.Unit]) {
-			currency := strings.TrimPrefix(unitValues[fact.Unit], "{http://www.xbrl.org/2003/iso4217}")
+			currency := strings.TrimPrefix(unitValues[fact.Unit], "{"+InvoiceCurrencyNamespace+"}")
 			cf := fact
 			cf.Value = currency
 			cf.Unit = ""
@@ -762,7 +809,7 @@ func invoiceContext(n *invoiceXMLNode) ([]InvoiceDimension, bool) {
 	seen := map[xml.Name]bool{}
 	var walk func(*invoiceXMLNode)
 	walk = func(c *invoiceXMLNode) {
-		if c.name.Space == "http://xbrl.org/2006/xbrldi" && (c.name.Local == "explicitMember" || c.name.Local == "typedMember") {
+		if c.name.Space == invoiceDimension && (c.name.Local == "explicitMember" || c.name.Local == "typedMember") {
 			name, ok := invoiceQName(c, invoiceXMLAttr(c, "", "dimension"))
 			if !ok || name.Space == "" || seen[name] {
 				valid = false
@@ -905,7 +952,7 @@ func invoiceMonetary(kind, name string) bool {
 // 入参: unit 展开的单位表示
 // 返回: 是否为三位大写币种度量
 func invoiceCurrencyUnit(unit string) bool {
-	const prefix = "{http://www.xbrl.org/2003/iso4217}"
+	const prefix = "{" + InvoiceCurrencyNamespace + "}"
 	if !strings.HasPrefix(unit, prefix) {
 		return false
 	}
@@ -995,7 +1042,7 @@ func invoiceObjectReferences(root *invoiceXMLNode) bool {
 // 返回: 发票及诊断，取消错误
 func invoicePlainXML(ctx context.Context, root *invoiceXMLNode, source InvoiceSource) (InvoiceReport, error) {
 	report := InvoiceReport{}
-	inv := Invoice{Kind: "einv", Standard: "EInvoice", Version: "0.3", Sources: []InvoiceSource{source}}
+	inv := Invoice{Kind: "einv", Standard: InvoiceStandardEInvoice, Version: "0.3", Sources: []InvoiceSource{source}}
 	namespace, itemPath := "", "/EInvoice/EInvoiceData/IssuItemInformation"
 	if root.name.Local == "eInvoice" {
 		if invoiceXMLAttr(root, "", "Version") != "1.0" || len(invoiceChildren(root, invoiceEDRM, "InvoiceNo")) == 0 {