{"id":2200,"date":"2026-08-22T07:19:42","date_gmt":"2026-08-22T07:19:42","guid":{"rendered":"https:\/\/www.vpascode.com\/ja\/mastering-architecture-visuals-how-to-build-a-c4-system-context-diagram-in-plantuml\/"},"modified":"2026-08-22T07:19:42","modified_gmt":"2026-08-22T07:19:42","slug":"mastering-architecture-visuals-how-to-build-a-c4-system-context-diagram-in-plantuml","status":"publish","type":"post","link":"https:\/\/www.vpascode.com\/ja\/mastering-architecture-visuals-how-to-build-a-c4-system-context-diagram-in-plantuml\/","title":{"rendered":"\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u53ef\u8996\u5316\u306e\u30de\u30b9\u30bf\u30fc\uff1aPlantUML \u3067 C4 \u30b7\u30b9\u30c6\u30e0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p class=\"lead\">\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30b7\u30b9\u30c6\u30e0\u3092\u8a2d\u8a08\u3059\u308b\u969b\u3001\u6280\u8853\u8005\u304a\u3088\u3073\u975e\u6280\u8853\u8005\u306e\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u53cc\u65b9\u306b\u5bfe\u3057\u3066\u9ad8\u30ec\u30d9\u30eb\u306e\u5883\u754c\u3092\u660e\u78ba\u306b\u4f1d\u3048\u308b\u3053\u3068\u306f\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u3053\u306e\u30de\u30b9\u30bf\u30fc\u30af\u30e9\u30b9\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u7121\u6599\u306e\u300c<a href=\"https:\/\/vpascode.com\/editor\">VPasCode\u300d<\/a>\u30a8\u30c7\u30a3\u30bf\u5185\u3067\u3001PlantUML \u3092\u4f7f\u7528\u3057\u3066\u30bc\u30ed\u304b\u3089\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u306a C4 \u30b7\u30b9\u30c6\u30e0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p id=\"ZzKEiQY\"><img fetchpriority=\"high\" alt=\"\" class=\"alignnone size-full wp-image-2795\" decoding=\"async\" fetchpriority=\"high\" height=\"775\" sizes=\"(max-width: 526px) 100vw, 526px\" src=\"https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bbd95ba8.png\" srcset=\"https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bbd95ba8.png 526w, https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bbd95ba8-204x300.png 204w\" width=\"526\"\/><\/p>\n<section>\n<h2>\u306a\u305c C4 \u30e2\u30c7\u30eb\u306b\u300c\u56f3\u5f62\u3092\u30b3\u30fc\u30c9\u3068\u3057\u3066\u8a18\u8ff0\u3059\u308b\u300d\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u63a1\u7528\u3059\u3079\u304d\u306a\u306e\u304b\uff1f<\/h2>\n<p>\u5f93\u6765\u306e\u30c9\u30e9\u30c3\u30b0\uff06\u30c9\u30ed\u30c3\u30d7\u5f0f\u306e\u63cf\u753b\u30c4\u30fc\u30eb\u306f\u3001\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u304c\u5909\u5316\u3059\u308b\u305f\u3073\u306b\u3001\u30dc\u30c3\u30af\u30b9\u306e\u4f4d\u7f6e\u305a\u308c\u3001\u4e00\u8cab\u6027\u306e\u306a\u3044\u30b9\u30bf\u30a4\u30eb\u3001\u305d\u3057\u3066\u9762\u5012\u306a\u624b\u52d5\u66f4\u65b0\u306b\u3064\u306a\u304c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002&#8221;\u56f3\u5f62\u3092\u30b3\u30fc\u30c9\u3068\u3057\u3066\u8a18\u8ff0\u3059\u308b\u30c4\u30fc\u30eb&#8221;\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001<a href=\"https:\/\/www.visual-paradigm.com\/features\/diagram-as-code-tool\/\">\u56f3\u5f62\u3092\u30b3\u30fc\u30c9\u3068\u3057\u3066\u8a18\u8ff0\u3059\u308b\u30c4\u30fc\u30eb&#8221;\uff08\u4f8b\uff1a\u7121\u6599\u306e PlantUML \u30a8\u30c7\u30a3\u30bf\uff09\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306f\u30b3\u30fc\u30c9\u3068\u540c\u671f\u3055\u308c\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u3001\u30af\u30ea\u30fc\u30f3\u306a\u72b6\u614b\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u3002<\/a>\u306e\u3088\u3046\u306a\u7121\u6599\u306e PlantUML \u30a8\u30c7\u30a3\u30bf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306f\u30b3\u30fc\u30c9\u3068\u540c\u671f\u3055\u308c\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u3001\u30af\u30ea\u30fc\u30f3\u306a\u72b6\u614b\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u3002&#8221;VPasCode&#8221;\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3068\u81ea\u52d5\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u691c\u51fa\u6a5f\u80fd\u306b\u3088\u308a\u3001\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u53ef\u8996\u5316\u304c\u6975\u3081\u3066\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<a href=\"https:\/\/vpascode.com\/editor\">VPasCode&#8221;<\/a>\u3001\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3068\u81ea\u52d5\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u691c\u51fa\u6a5f\u80fd\u306b\u3088\u308a\u3001\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u53ef\u8996\u5316\u304c\u6975\u3081\u3066\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/section>\n<section>\n<h2>\u30de\u30b9\u30bf\u30fc\u30af\u30e9\u30b9\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3\uff1a\u30aa\u30f3\u30e9\u30a4\u30f3 Grocery Store\uff08\u98df\u6599\u54c1\u5e97\uff09\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3<\/h2>\n<p>\u5805\u7262\u306a\u30b7\u30b9\u30c6\u30e0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u306e\u69cb\u9020\u65b9\u6cd5\u3092\u30c7\u30e2\u30f3\u30b9\u30c8\u30ec\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u305f\u3081\u306b\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u98df\u6599\u54c1\u5e97\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3067\u306f\u3001\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u3001\u5916\u90e8\u306e\u914d\u9001\u30c9\u30e9\u30a4\u30d0\u30fc\u3001\u30b3\u30a2\u3068\u306a\u308b\u98df\u6599\u54c1\u30b7\u30b9\u30c6\u30e0\u3001\u304a\u3088\u3073\u6c7a\u6e08\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3084\u7269\u6d41\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306a\u3069\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u3092\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u3001\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u3067\u89e3\u8aac\u3057\u3066\u3044\u304f\u5b8c\u5168\u306a PlantUML \u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n<pre><code class=\"language-plantuml\">@startuml\r\n!include https:\/\/raw.githubusercontent.com\/plantuml-stdlib\/C4-PlantUML\/master\/C4_Context.puml\r\nskinparam vpDiagramType C4modelSystemContextDiagram\r\n\r\nLAYOUT_TOP_DOWN()\r\nLAYOUT_WITH_LEGEND()\r\n\r\ntitle \u30aa\u30f3\u30e9\u30a4\u30f3\u98df\u6599\u54c1\u5e97\u306e\u30b7\u30b9\u30c6\u30e0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\r\n\r\nPerson(customer, \"\u9867\u5ba2\", \"\u5e97\u8217\u3092\u95b2\u89a7\u3057\u3001\u98df\u6599\u54c1\u3092\u6ce8\u6587\u3057\u3001\u914d\u9001\u3092\u4e88\u7d04\u3059\u308b\")\r\nPerson_Ext(driver, \"\u914d\u9001\u30c9\u30e9\u30a4\u30d0\u30fc\", \"\u9867\u5ba2\u306b\u6ce8\u6587\u3092\u914d\u9001\u3059\u308b\")\r\n\r\nEnterprise_Boundary(grocery_co, \"\u30aa\u30f3\u30e9\u30a4\u30f3\u98df\u6599\u54c1\u5e97\") {\r\n  System(grocery_system, \"\u30aa\u30f3\u30e9\u30a4\u30f3\u98df\u6599\u54c1\u5e97\u30b7\u30b9\u30c6\u30e0\", \"\u9867\u5ba2\u304c\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u98df\u6599\u54c1\u3092\u6ce8\u6587\u3057\u3001\u7d0d\u54c1\u3092\u7ba1\u7406\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\")\r\n}\r\n\r\nSystem_Ext(payment, \"\u6c7a\u6e08\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\", \"\u30ab\u30fc\u30c9\u304a\u3088\u3073\u30c7\u30b8\u30bf\u30eb\u30a6\u30a9\u30ec\u30c3\u30c8\u306e\u6c7a\u6e08\u3092\u51e6\u7406\u3059\u308b\")\r\nSystem_Ext(shipping, \"\u7269\u6d41\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\", \"\u914d\u9001\u30eb\u30fc\u30c8\u3092\u8a08\u753b\u3057\u3001\u30c9\u30e9\u30a4\u30d0\u30fc\u306e\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3092\u7ba1\u7406\u3059\u308b\")\r\n\r\nRel(customer, grocery_system, \"\u5546\u54c1\u3092\u95b2\u89a7\u3057\u6ce8\u6587\u3092\u51fa\u3059\", \"HTTPS\")\r\nRel(grocery_system, payment, \"\u6c7a\u6e08\u3092\u51e6\u7406\u3059\u308b\", \"HTTPS\/API\")\r\nRel(grocery_system, shipping, \"\u914d\u9001\u30b8\u30e7\u30d6\u3092\u4f5c\u6210\u3059\u308b\", \"HTTPS\/API\")\r\nRel(driver, grocery_system, \"\u914d\u9001\u5272\u308a\u5f53\u3066\u3092\u8868\u793a\u3059\u308b\", \"HTTPS\")\r\n\r\n@enduml<\/code><\/pre>\n<\/section>\n<section>\n<h2>\u30b3\u30fc\u30c9\u306e\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u89e3\u8aac<\/h2>\n<h3>1. \u57fa\u76e4\u74b0\u5883\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7<\/h3>\n<p>\u307e\u305a\u3001\u6a19\u6e96\u7684\u306a PlantUML \u30bf\u30b0\u3067\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u521d\u671f\u5316\u3057\u3001\u516c\u5f0f\u306e C4-PlantUML \u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u30de\u30af\u30ed\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304b\u3089\u59cb\u3081\u307e\u3059\u3002&#8221;C4_Context.puml&#8221;\u3092\u53c2\u7167\u3059\u308b\u3053\u3068\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u306b\u7279\u5316\u3057\u305f\u30bb\u30de\u30f3\u30c6\u30a3\u30c3\u30af\u8981\u7d20\u3092\u89e3\u653e\u3057\u307e\u3059\u3002<code>C4_Context.puml\"<\/code>\u3001\u30b7\u30b9\u30c6\u30e0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u306b\u7279\u5316\u3057\u305f\u30bb\u30de\u30f3\u30c6\u30a3\u30c3\u30af\u8981\u7d20\u3092\u89e3\u653e\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\uff1a<\/strong> <code>!include ...\/C4_Context.puml<\/code>\u306f\u3001\u4eba\u3001\u30b7\u30b9\u30c6\u30e0\u3001\u5883\u754c\u306b\u95a2\u3059\u308b\u6a19\u6e96\u7684\u306a\u5f62\u72b6\u3001\u8272\u3001\u304a\u3088\u3073\u30b9\u30bf\u30a4\u30eb\u30eb\u30fc\u30eb\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002<\/li>\n<li><strong>\u56f3\u5f62\u306e\u30bf\u30a4\u30d7\u6307\u5b9a\u3068\u30ec\u30a4\u30a2\u30a6\u30c8\uff1a<\/strong>&#8220;skinparam vpDiagramType C4modelSystemContextDiagram&#8221;\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001<code>skinparam vpDiagramType C4modelSystemContextDiagram\"<\/code>\u304c&#8221;VPasCode&#8221;\u5185\u3067\u9069\u5207\u306b\u7d71\u5408\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u3001<a href=\"https:\/\/vpascode.com\/editor\">VPasCode&#8221;<\/a>\u3001<code>LAYOUT_TOP_DOWN()<\/code>\u306f\u3001\u8996\u899a\u7684\u306a\u968e\u5c64\u69cb\u9020\u3092\u4e0a\u90e8\u304b\u3089\u4e0b\u90e8\u3078\u304d\u308c\u3044\u306b\u6574\u7406\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u79c1\u306f<code>LAYOUT_WITH_LEGEND()<\/code>\u30ad\u30e3\u30f3\u30d0\u30b9\u306e\u53f3\u4e0b\u306b\u4fbf\u5229\u306a\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u30ac\u30a4\u30c9\u3092\u81ea\u52d5\u7684\u306b\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>2. \u30a2\u30af\u30bf\u30fc\u3068\u30e6\u30fc\u30b6\u30fc\u306e\u5b9a\u7fa9<\/h3>\n<p>\u6b21\u306b\u3001\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u3068\u76f8\u4e92\u4f5c\u7528\u3059\u308b\u4eba\u9593\u306e\u30a2\u30af\u30bf\u30fc\u3092\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u7279\u5b9a\u306eC4\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u3066\u3001\u6a19\u6e96\u7684\u306a\u30b7\u30b9\u30c6\u30e0\u30e6\u30fc\u30b6\u30fc\u3068\u5916\u90e8\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u533a\u5225\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u30b3\u30a2\u30e6\u30fc\u30b6\u30fc\uff1a<\/strong> \u4ee5\u4e0b\u306e\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u3066\u4e3b\u8981\u306a\u30e6\u30fc\u30b6\u30fc\u3092\u4f5c\u6210\u3057\u307e\u3059\uff1a<code>Person(customer, \"Customer\", ...)<\/code>\u3053\u308c\u306f\u3001\u6ce8\u6587\u3092\u958b\u59cb\u3057\u3001\u5728\u5eab\u3092\u95b2\u89a7\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u5916\u90e8\u30a2\u30af\u30bf\u30fc\uff1a<\/strong> \u4ee5\u4e0b\u306e\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u3066\u914d\u9001\u30c9\u30e9\u30a4\u30d0\u30fc\u3092\u5b9a\u7fa9\u3057\u307e\u3059\uff1a<code>Person_Ext(driver, \"Delivery Driver\", ...)<\/code>\u3053\u308c\u306f\u3001\u5f7c\u3089\u304c\u79c1\u305f\u3061\u306e\u5c65\u884c\u30d5\u30ed\u30fc\u3068\u76f8\u4e92\u4f5c\u7528\u3059\u308b\u4e00\u65b9\u3067\u3001\u30b3\u30a2\u306e\u5185\u90e8\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5883\u754c\u306e\u5916\u306b\u5b58\u5728\u3059\u308b\u3053\u3068\u3092\u5f37\u8abf\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>3. \u7d44\u7e54\u5883\u754c\u3068\u30b3\u30a2\u30b7\u30b9\u30c6\u30e0\u306e\u78ba\u7acb<\/h3>\n<p>\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u660e\u78ba\u3055\u306b\u306f\u660e\u78ba\u306a\u5883\u754c\u304c\u5fc5\u8981\u3067\u3059\u3002\u5f53\u793e\u304c\u6240\u6709\u3059\u308b\u3082\u306e\u3068\u5916\u90e8\u30d9\u30f3\u30c0\u30fc\u306b\u4f9d\u5b58\u3059\u308b\u3082\u306e\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3059\u308b\u305f\u3081\u306b\u3001\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u5883\u754c\u3092\u78ba\u7acb\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u5883\u754c\uff1a<\/strong> \u4ee5\u4e0b\u306e\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u3066\uff1a<code>Enterprise_Boundary(grocery_co, \"Online Grocery Store\")<\/code>\u5185\u90e8\u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u3092\u8996\u899a\u7684\u306b\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u70b9\u7dda\u306e\u30b3\u30f3\u30c6\u30ca\u30dc\u30c3\u30af\u30b9\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u5185\u90e8\u30b7\u30b9\u30c6\u30e0\uff1a<\/strong> \u3053\u306e\u5883\u754c\u5185\u306b\u3001\u4ee5\u4e0b\u306e\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u3066\u4e3b\u8981\u306a\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u8cc7\u7523\u3092\u914d\u7f6e\u3057\u307e\u3059\uff1a<code>System(grocery_system, \"Online Grocery Store System\", ...)<\/code>.<\/li>\n<\/ul>\n<h3>4. \u5916\u90e8\u30b7\u30b9\u30c6\u30e0\u306e\u7d71\u5408<\/h3>\n<p>\u73fe\u4ee3\u306ee\u30b3\u30de\u30fc\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u304c\u5b64\u7acb\u3057\u3066\u52d5\u4f5c\u3059\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u5883\u754c\u306e\u5916\u306b\u3042\u308b\u5916\u90e8\u4f9d\u5b58\u95a2\u4fc2\u3092\u3001\u5c02\u7528\u306e\u5916\u90e8\u30b7\u30b9\u30c6\u30e0\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u652f\u6255\u3044\u51e6\u7406\uff1a<\/strong> <code>System_Ext(payment, \"Payment Gateway\", ...)<\/code>\u3053\u308c\u306f\u7b2c\u4e09\u8005\u306b\u3088\u308b\u91d1\u878d\u53d6\u5f15\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u7269\u6d41\u3068\u914d\u9001\uff1a<\/strong> <code>System_Ext(shipping, \"Logistics Provider\", ...)<\/code>\u3053\u308c\u306f\u30eb\u30fc\u30c8\u8a08\u753b\u3068\u30c9\u30e9\u30a4\u30d0\u30fc\u306e\u5272\u308a\u5f53\u3066\u3092\u51e6\u7406\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>5. \u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\u3068\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u30de\u30c3\u30d4\u30f3\u30b0<\/h3>\n<p>\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3092\u7d71\u5408\u3059\u308b\u305f\u3081\u306b\u3001\u79c1\u306f\u4ee5\u4e0b\u306e<code>Rel()<\/code>\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u3066\u3001\u53cc\u65b9\u5411\u306e\u76f8\u4e92\u4f5c\u7528\u3068\u901a\u4fe1\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u30de\u30c3\u30d4\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u9867\u5ba2\u30d5\u30ed\u30fc\uff1a<\/strong> <code>Rel(customer, grocery_system, \"Browses products and places orders\", \"HTTPS\")<\/code>\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30b3\u30a2\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306b\u3069\u306e\u3088\u3046\u306b\u5b89\u5168\u306b\u63a5\u7d9a\u3059\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u7d71\u5408\uff1a<\/strong>\u79c1\u306f\u3001\u652f\u6255\u3044\u51e6\u7406\u3084\u914d\u9001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306a\u3069\u306e\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u4f9d\u5b58\u95a2\u4fc2\u3092\u3001\u660e\u78ba\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u30e9\u30d9\u30eb\uff08<code>\"HTTPS\/API\"<\/code>\uff09\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u5373\u5ea7\u306b\u6280\u8853\u7684\u306a\u6587\u8108\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>\u7d50\u8ad6 &amp; \u5b9f\u969b\u306b\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046<\/h2>\n<p>\u30af\u30ea\u30fc\u30f3\u306a\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u56f3\u306e\u4f5c\u6210\u306b\u306f\u3001\u7169\u96d1\u306a\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u30c4\u30fc\u30eb\u3084\u8907\u96d1\u306a\u30d5\u30a1\u30a4\u30eb\u8a2d\u5b9a\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002PlantUML \u306e\u5f37\u529b\u306a C4 \u69cb\u6587\u3092<a href=\"https:\/\/vpascode.com\/\">VPasCode<\/a>\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u6570\u79d2\u3067\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u56f3\u306e\u4f5c\u6210\u3001\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3001\u5171\u6709\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p id=\"jnVfaiv\"><img alt=\"A screenshot of Visual Paradigm VPasCode showing the creation of a C4 System Context Diagram\" class=\"alignnone wp-image-2794 size-full\" decoding=\"async\" height=\"788\" sizes=\"(max-width: 1400px) 100vw, 1400px\" src=\"https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bb75a583.png\" srcset=\"https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bb75a583.png 1400w, https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bb75a583-300x169.png 300w, https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bb75a583-1024x576.png 1024w, https:\/\/www.vpascode.com\/wp-content\/uploads\/2026\/08\/img_6a841bb75a583-768x432.png 768w\" width=\"1400\"\/><\/p>\n<p>\u81ea\u5206\u3060\u3051\u306e\u30b7\u30b9\u30c6\u30e0\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u69cb\u7bc9\u3092\u8a66\u3057\u3066\u307f\u307e\u305b\u3093\u304b\uff1f<a href=\"https:\/\/vpascode.com\/editor\">\u7121\u6599\u306e VPasCode \u30aa\u30f3\u30e9\u30a4\u30f3\u30a8\u30c7\u30a3\u30bf<\/a>\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3001\u3053\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3092\u8cbc\u308a\u4ed8\u3051\u3001\u56f3\u304c\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u69d8\u5b50\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30b7\u30b9\u30c6\u30e0\u3092\u8a2d\u8a08\u3059\u308b\u969b\u3001\u6280\u8853\u8005\u304a\u3088\u3073\u975e\u6280\u8853\u8005\u306e\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u53cc\u65b9\u306b\u5bfe&#8230;","protected":false},"author":4,"featured_media":2201,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Build C4 System Context Diagrams with PlantUML | VPasCode","_yoast_wpseo_metadesc":"Learn how to design a C4 System Context diagram for an online grocery store using PlantUML and VPasCode. 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