diff --git a/Packages/vChewing_MainAssembly/Sources/MainAssembly/CandidateTextService_SelectorImpl.swift b/Packages/vChewing_MainAssembly/Sources/MainAssembly/CandidateTextService_SelectorImpl.swift
new file mode 100644
index 00000000..4b420bbe
--- /dev/null
+++ b/Packages/vChewing_MainAssembly/Sources/MainAssembly/CandidateTextService_SelectorImpl.swift
@@ -0,0 +1,148 @@
+// (c) 2021 and onwards The vChewing Project (MIT-NTL License).
+// ====================
+// This code is released under the MIT license (SPDX-License-Identifier: MIT)
+// ... with NTL restriction stating that:
+// No trademark license is granted to use the trade names, trademarks, service
+// marks, or product names of Contributor, except as required to fulfill notice
+// requirements defined in MIT License.
+
+import BrailleSputnik
+import Foundation
+import Shared
+import Tekkon
+
+public extension CandidateTextService {
+  // MARK: - Selector Methods, CandidatePairServicable, and the Coordinator.
+
+  var responseFromSelector: String? {
+    switch value {
+    case .url: return nil
+    case let .selector(string):
+      let passable = CandidatePairServicable(value: candidateText, reading: reading)
+      return Coordinator().runTask(selectorName: string, candidate: passable)
+    }
+  }
+
+  @objcMembers class CandidatePairServicable: NSObject {
+    public var value: String
+    public var reading: [String]
+    public init(value: String, reading: [String] = []) {
+      self.value = value
+      self.reading = reading
+    }
+
+    public typealias SubPair = (key: String, value: String)
+
+    @nonobjc var smashed: [SubPair] {
+      var pairs = [SubPair]()
+      if value.count != reading.count {
+        pairs.append((reading.joined(separator: " "), value))
+      } else {
+        value.enumerated().forEach { i, valChar in
+          pairs.append((reading[i], valChar.description))
+        }
+      }
+      return pairs
+    }
+  }
+
+  @objc class Coordinator: NSObject {
+    private var result: String?
+
+    public func runTask(selectorName: String, candidate param: CandidatePairServicable) -> String? {
+      guard !selectorName.isEmpty, !param.value.isEmpty else { return nil }
+      guard responds(to: Selector(selectorName)) else { return nil }
+      performSelector(onMainThread: Selector(selectorName), with: param, waitUntilDone: true)
+      defer { result = nil }
+      return result
+    }
+
+    /// 生成 Unicode 統一碼碼位中繼資料。
+    /// - Parameter param: 要處理的詞音配對物件。
+    @objc func copyUnicodeMetadata(_ param: CandidatePairServicable) {
+      var resultArray = [String]()
+      param.value.forEach { char in
+        resultArray.append("\(char) \(char.description.charDescriptions.first ?? "NULL")")
+      }
+      result = resultArray.joined(separator: "\n")
+    }
+
+    /// 生成 HTML Ruby (教科書注音)。
+    /// - Parameter param: 要處理的詞音配對物件。
+    @objc func copyRubyHTMLZhuyinTextbookStyle(_ param: CandidatePairServicable) {
+      prepareTextBookZhuyinReadings(param)
+      copyRubyHTMLCommon(param)
+    }
+
+    /// 生成 HTML Ruby (教科書漢語拼音注音)。
+    /// - Parameter param: 要處理的詞音配對物件。
+    @objc func copyRubyHTMLHanyuPinyinTextbookStyle(_ param: CandidatePairServicable) {
+      prepareTextBookPinyinReadings(param)
+      copyRubyHTMLCommon(param)
+    }
+
+    /// 生成內文讀音標注 (教科書注音)。
+    /// - Parameter param: 要處理的詞音配對物件。
+    @objc func copyInlineZhuyinAnnotationTextbookStyle(_ param: CandidatePairServicable) {
+      prepareTextBookZhuyinReadings(param)
+      copyInlineAnnotationCommon(param)
+    }
+
+    /// 生成內文讀音標注 (教科書漢語拼音注音)。
+    /// - Parameter param: 要處理的詞音配對物件。
+    @objc func copyInlineHanyuPinyinAnnotationTextbookStyle(_ param: CandidatePairServicable) {
+      prepareTextBookPinyinReadings(param)
+      copyInlineAnnotationCommon(param)
+    }
+
+    @objc func copyBraille1947(_ param: CandidatePairServicable) {
+      result = BrailleSputnik(standard: .of1947).convertToBraille(smashedPairs: param.smashed)
+    }
+
+    @objc func copyBraille2018(_ param: CandidatePairServicable) {
+      result = BrailleSputnik(standard: .of2018).convertToBraille(smashedPairs: param.smashed)
+    }
+
+    // MARK: Privates
+  }
+}
+
+private extension CandidateTextService.Coordinator {
+  func copyInlineAnnotationCommon(_ param: CandidateTextService.CandidatePairServicable) {
+    var composed = ""
+    param.smashed.forEach { subPair in
+      let subKey = subPair.key
+      let subValue = subPair.value
+      composed += subKey.contains("_") ? subValue : "\(subValue)(\(subKey))"
+    }
+    result = composed
+  }
+
+  func copyRubyHTMLCommon(_ param: CandidateTextService.CandidatePairServicable) {
+    var composed = ""
+    param.smashed.forEach { subPair in
+      let subKey = subPair.key
+      let subValue = subPair.value
+      composed += subKey.contains("_") ? subValue : "<ruby>\(subValue)<rp>(</rp><rt>\(subKey)</rt><rp>)</rp></ruby>"
+    }
+    result = composed
+  }
+
+  func prepareTextBookZhuyinReadings(_ param: CandidateTextService.CandidatePairServicable) {
+    let newReadings = param.reading.map { currentReading in
+      if currentReading.contains("_") { return "_??" }
+      return Tekkon.cnvPhonaToTextbookReading(target: currentReading)
+    }
+    param.reading = newReadings
+  }
+
+  func prepareTextBookPinyinReadings(_ param: CandidateTextService.CandidatePairServicable) {
+    let newReadings = param.reading.map { currentReading in
+      if currentReading.contains("_") { return "_??" }
+      return Tekkon.cnvHanyuPinyinToTextbookStyle(
+        targetJoined: Tekkon.cnvPhonaToHanyuPinyin(targetJoined: currentReading)
+      )
+    }
+    param.reading = newReadings
+  }
+}
diff --git a/Packages/vChewing_MainAssembly/Tests/MainAssemblyTests/CandidateServiceCoordinatorTests.swift b/Packages/vChewing_MainAssembly/Tests/MainAssemblyTests/CandidateServiceCoordinatorTests.swift
new file mode 100644
index 00000000..cf639e13
--- /dev/null
+++ b/Packages/vChewing_MainAssembly/Tests/MainAssemblyTests/CandidateServiceCoordinatorTests.swift
@@ -0,0 +1,126 @@
+// (c) 2021 and onwards The vChewing Project (MIT-NTL License).
+// ====================
+// This code is released under the MIT license (SPDX-License-Identifier: MIT)
+// ... with NTL restriction stating that:
+// No trademark license is granted to use the trade names, trademarks, service
+// marks, or product names of Contributor, except as required to fulfill notice
+// requirements defined in MIT License.
+
+import CocoaExtension
+import InputMethodKit
+import LangModelAssembly
+@testable import MainAssembly
+import Shared
+import XCTest
+
+class CandidateServiceCoordinatorTests: XCTestCase {
+  static let testDataMap: [String] = [
+    #"Unicode Metadata: %s"# + "\t" + #"@SEL:copyUnicodeMetadata:"#,
+    #"HTML Ruby Zhuyin: %s"# + "\t" + #"@SEL:copyRubyHTMLZhuyinTextbookStyle:"#,
+    #"HTML Ruby Pinyin: %s"# + "\t" + #"@SEL:copyRubyHTMLHanyuPinyinTextbookStyle:"#,
+    #"Zhuyin Annotation: %s"# + "\t" + #"@SEL:copyInlineZhuyinAnnotationTextbookStyle:"#,
+    #"Pinyin Annotation: %s"# + "\t" + #"@SEL:copyInlineHanyuPinyinAnnotationTextbookStyle:"#,
+    #"Braille 1947: %s"# + "\t" + #"@SEL:copyBraille1947:"#,
+    #"Braille 2018: %s"# + "\t" + #"@SEL:copyBraille2018:"#,
+  ]
+
+  func testSelector_UnicodeMetadata() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack(
+      candidate: "胡桃", reading: ["ㄏㄨˊ", "ㄊㄠˊ"]
+    )
+    let theService = stacked[0]
+    switch theService.value {
+    case .url: break
+    case .selector:
+      let response = theService.responseFromSelector
+      let expectedResponse = "胡 U+80E1 CJK UNIFIED IDEOGRAPH-80E1\n桃 U+6843 CJK UNIFIED IDEOGRAPH-6843"
+      XCTAssertEqual(response, expectedResponse)
+    }
+  }
+
+  func testSelector_HTMLRubyZhuyinTextbookStyle() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack(
+      candidate: "甜的", reading: ["ㄊㄧㄢˊ", "ㄉㄜ˙"]
+    )
+    let theService = stacked[1]
+    switch theService.value {
+    case .url: break
+    case .selector:
+      let response = theService.responseFromSelector
+      let expectedResponse = "<ruby>甜<rp>(</rp><rt>ㄊㄧㄢˊ</rt><rp>)</rp></ruby><ruby>的<rp>(</rp><rt>˙ㄉㄜ</rt><rp>)</rp></ruby>"
+      XCTAssertEqual(response, expectedResponse)
+    }
+  }
+
+  func testSelector_HTMLRubyPinyinTextbookStyle() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack(
+      candidate: "鐵嘴", reading: ["ㄊㄧㄝˇ", "ㄗㄨㄟˇ"]
+    )
+    let theService = stacked[2]
+    switch theService.value {
+    case .url: break
+    case .selector:
+      let response = theService.responseFromSelector
+      let expectedResponse = "<ruby>鐵<rp>(</rp><rt>tiě</rt><rp>)</rp></ruby><ruby>嘴<rp>(</rp><rt>zuǐ</rt><rp>)</rp></ruby>"
+      XCTAssertEqual(response, expectedResponse)
+    }
+  }
+
+  func testSelector_InlineAnnotationZhuyinTextbookStyle() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack(
+      candidate: "甜的", reading: ["ㄊㄧㄢˊ", "ㄉㄜ˙"]
+    )
+    let theService = stacked[3]
+    switch theService.value {
+    case .url: break
+    case .selector:
+      let response = theService.responseFromSelector
+      let expectedResponse = "甜(ㄊㄧㄢˊ)的(˙ㄉㄜ)"
+      XCTAssertEqual(response, expectedResponse)
+    }
+  }
+
+  func testSelector_InlineAnnotationTextbookStyle() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack(
+      candidate: "鐵嘴", reading: ["ㄊㄧㄝˇ", "ㄗㄨㄟˇ"]
+    )
+    let theService = stacked[4]
+    switch theService.value {
+    case .url: break
+    case .selector:
+      let response = theService.responseFromSelector
+      let expectedResponse = "鐵(tiě)嘴(zuǐ)"
+      XCTAssertEqual(response, expectedResponse)
+    }
+  }
+
+  func testSelector_Braille1947() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack(
+      candidate: "高科技公司的",
+      reading: ["ㄍㄠ", "ㄎㄜ", "ㄐㄧˋ", "ㄍㄨㄥ", "ㄙ", "ㄉㄜ˙"]
+    )
+    let theService = stacked[5]
+    switch theService.value {
+    case .url: break
+    case .selector:
+      let response = theService.responseFromSelector
+      let expectedResponse = "⠅⠩⠄⠇⠮⠄⠅⠡⠐⠅⠯⠄⠑⠄⠙⠮⠁"
+      XCTAssertEqual(response, expectedResponse)
+    }
+  }
+
+  func testSelector_Braille2018() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack(
+      candidate: "高科技公司的",
+      reading: ["ㄍㄠ", "ㄎㄜ", "ㄐㄧˋ", "ㄍㄨㄥ", "ㄙ", "ㄉㄜ˙"]
+    )
+    let theService = stacked[6]
+    switch theService.value {
+    case .url: break
+    case .selector:
+      let response = theService.responseFromSelector
+      let expectedResponse = "⠛⠖⠁⠅⠢⠁⠛⠊⠆⠛⠲⠁⠎⠁⠙⠢"
+      XCTAssertEqual(response, expectedResponse)
+    }
+  }
+}
diff --git a/Packages/vChewing_Shared/Sources/Shared/CandidateTextService.swift b/Packages/vChewing_Shared/Sources/Shared/CandidateTextService.swift
new file mode 100644
index 00000000..b11f693a
--- /dev/null
+++ b/Packages/vChewing_Shared/Sources/Shared/CandidateTextService.swift
@@ -0,0 +1,102 @@
+// (c) 2021 and onwards The vChewing Project (MIT-NTL License).
+// ====================
+// This code is released under the MIT license (SPDX-License-Identifier: MIT)
+// ... with NTL restriction stating that:
+// No trademark license is granted to use the trade names, trademarks, service
+// marks, or product names of Contributor, except as required to fulfill notice
+// requirements defined in MIT License.
+
+import Foundation
+
+public struct CandidateTextService: Codable {
+  public enum ServiceValueType: Int {
+    case url = 0
+    case selector = 1
+  }
+
+  public enum ServiceValue: Codable {
+    case url(URL)
+    case selector(String)
+  }
+
+  public let key: String
+  public let reading: [String]
+  public let menuTitle: String
+  public let definedValue: String
+  public let value: ServiceValue
+  public let candidateText: String
+
+  public init?(key: String, definedValue: String, param: String = #"%s"#, reading: [String] = []) {
+    guard !key.isEmpty, !definedValue.isEmpty, definedValue.first != "#" else { return nil }
+    candidateText = param
+    self.key = key.replacingOccurrences(of: #"%s"#, with: param)
+    self.reading = reading
+    let rawKeyHasParam = self.key != key
+    self.definedValue = definedValue.replacingOccurrences(of: #"%s"#, with: param)
+
+    // Handle Symbol Menu Title
+    var newMenuTitle = self.key
+    if param.count == 1, let strUTFCharCode = param.first?.codePoint, rawKeyHasParam {
+      newMenuTitle = "\(self.key) (\(strUTFCharCode))"
+    }
+    menuTitle = newMenuTitle
+
+    // Start parsing rawValue
+    var temporaryRawValue = definedValue
+    var finalServiceValue: ServiceValue?
+    let fetchedTypeHeader = temporaryRawValue.prefix(5)
+    guard fetchedTypeHeader.count == 5 else { return nil }
+    for _ in 0 ..< 5 {
+      temporaryRawValue.removeFirst()
+    }
+    switch fetchedTypeHeader.uppercased() {
+    case #"@SEL:"#:
+      finalServiceValue = .selector(temporaryRawValue)
+    case #"@WEB:"#, #"@URL:"#:
+      let encodedParam = param.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)
+      guard let encodedParam = encodedParam else { return nil }
+      let newURL = URL(string: temporaryRawValue.replacingOccurrences(of: #"%s"#, with: encodedParam))
+      guard let newURL = newURL else { return nil }
+      finalServiceValue = .url(newURL)
+    default: return nil
+    }
+    guard let finalServiceValue = finalServiceValue else { return nil }
+    value = finalServiceValue
+  }
+}
+
+extension CandidateTextService: RawRepresentable {
+  public init?(rawValue: String) {
+    let cells = rawValue.components(separatedBy: "\t")
+    guard cells.count == 2 else { return nil }
+    self.init(key: cells[0], definedValue: cells[1])
+  }
+
+  public var rawValue: String {
+    "\(key)\t\(definedValue)"
+  }
+
+  public init?(rawValue: String, param: String, reading: [String]) {
+    let cells = rawValue.components(separatedBy: "\t")
+    guard cells.count >= 2 else { return nil }
+    self.init(key: cells[0], definedValue: cells[1], param: param, reading: reading)
+  }
+}
+
+// MARK: - Extensions
+
+public extension Array where Element == CandidateTextService {
+  var rawRepresentation: [String] {
+    map(\.rawValue)
+  }
+}
+
+public extension Array where Element == String {
+  func parseIntoCandidateTextServiceStack(
+    candidate: String = #"%s"#, reading: [String] = []
+  ) -> [CandidateTextService] {
+    compactMap { rawValue in
+      CandidateTextService(rawValue: rawValue, param: candidate, reading: reading)
+    }
+  }
+}
diff --git a/Packages/vChewing_Shared/Tests/SharedTests/SharedTests.swift b/Packages/vChewing_Shared/Tests/SharedTests/SharedTests.swift
index 28ea972a..0c0c1018 100644
--- a/Packages/vChewing_Shared/Tests/SharedTests/SharedTests.swift
+++ b/Packages/vChewing_Shared/Tests/SharedTests/SharedTests.swift
@@ -10,9 +10,26 @@
 import XCTest
 
 final class SharedTests: XCTestCase {
+  // MARK: - PrefMgr().dumpShellScriptBackup()
+
   func testDumpedPrefs() throws {
     let prefs = PrefMgr()
     let fetched = prefs.dumpShellScriptBackup() ?? ""
     XCTAssertFalse(fetched.isEmpty)
   }
+
+  // MARK: - CandidateTextService (Basic Tests)
+
+  static let testDataMap: [String] = [
+    #"Bing: %s"# + "\t" + #"@WEB:https://www.bing.com/search?q=%s"#,
+    #"Ecosia: %s"# + "\t" + #"@WEB:https://www.ecosia.org/search?method=index&q=%s"#,
+  ]
+
+  func testDataRestoration() throws {
+    let stacked = Self.testDataMap.parseIntoCandidateTextServiceStack()
+    stacked.forEach { currentService in
+      print(currentService)
+    }
+    XCTAssertEqual(stacked.rawRepresentation, Self.testDataMap)
+  }
 }