翻译：Wu Gang
原文地址：https://iiif.io/api/cookbook/recipe/0202-start-canvas/
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用例

在某些情况下，书籍对象将具有大多数用户想要跳过的前页译者注：例如扉页、版权页、目次等部分，例如空白页（或者可能是装订的照片和其他非文本视图或颜色校准图像）。在本专题中，我们演示了使用 start 属性告诉展示客户端在加载资源时跳过初始 Canvas（空白页面），而显示第二个 Canvas（内容开始处）。

实施说明

通过添加客户端在特定 Canvas 上加载 Manfiest 所需的信息，本专题扩展了“ 多个相关图像（书籍等）”。这是通过将 start 属性添加到 Manifest 上，并指定客户端在初始化时应该显示的 Canvas 来完成的。
start 属性的目标必须是具有 id 和 type 属性的 JSON 对象，其中 type 可以是 Canvas 或带有 Selector 的特定资源。在本用例中，目标 type 属性是 Canvas (“type”: “Canvas”)。
有关使用带有 Selector 的特定资源的 start 属性的示例，请参阅“在特定点开始回放 - 基于时间的媒体”。 有关 start 属性的更多信息，请参阅：start属性。

示例

这个例子展示了一个书籍对象的带有多个Canvas 的 Manifest。 start 属性指定在第二个 Canvas 上加载 Manifest。 请注意，所有 Canvas 仍显示在查看器中，用户可以使用查看器导航控件导航回第一个 Canvas。
JSON-LD | 在 Mirador 中查看

  1. {
  2.   "@context": "http://iiif.io/api/presentation/3/context.json",
  3.   "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/manifest.json",
  4.   "type": "Manifest",
  5.   "label": {
  6.     "en": [
  7.       "Multiple Related Images (Book, etc.)"
  8.     ]
  9.   },
  10.   "start": {
  11.     "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p2",
  12.     "type": "Canvas"
  13.   },
  14.   "items": [
  15.     {
  16.       "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p1",
  17.       "type": "Canvas",
  18.       "label": {
  19.         "en": [
  20.           "Blank page"
  21.         ]
  22.       },
  23.       "height": 4613,
  24.       "width": 3204,
  25.       "items": [
  26.         {
  27.           "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/page/p1/1",
  28.           "type": "AnnotationPage",
  29.           "items": [
  30.             {
  31.               "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/annotation/p0001-image",
  32.               "type": "Annotation",
  33.               "motivation": "painting",
  34.               "body": {
  35.                 "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f18/full/max/0/default.jpg",
  36.                 "type": "Image",
  37.                 "format": "image/jpeg",
  38.                 "height": 4613,
  39.                 "width": 3204,
  40.                 "service": [
  41.                   {
  42.                     "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f18",
  43.                     "type": "ImageService3",
  44.                     "profile": "level1"
  45.                   }
  46.                 ]
  47.               },
  48.               "target": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p1"
  49.             }
  50.           ]
  51.         }
  52.       ]
  53.     },
  54.     {
  55.       "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p2",
  56.       "type": "Canvas",
  57.       "label": {
  58.         "en": [
  59.           "Frontispiece"
  60.         ]
  61.       },
  62.       "width": 3186,
  63.       "height": 4612,
  64.       "items": [
  65.         {
  66.           "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/page/p2/1",
  67.           "type": "AnnotationPage",
  68.           "items": [
  69.             {
  70.               "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/annotation/p0002-image",
  71.               "type": "Annotation",
  72.               "motivation": "painting",
  73.               "body": {
  74.                 "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f19/full/max/0/default.jpg",
  75.                 "type": "Image",
  76.                 "format": "image/jpeg",
  77.                 "width": 3186,
  78.                 "height": 4612,
  79.                 "service": [
  80.                   {
  81.                     "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f19",
  82.                     "type": "ImageService3",
  83.                     "profile": "level1"
  84.                   }
  85.                 ]
  86.               },
  87.               "target": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p2"
  88.             }
  89.           ]
  90.         }
  91.       ]
  92.     },
  93.     {
  94.       "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p3",
  95.       "type": "Canvas",
  96.       "label": {
  97.         "en": [
  98.           "Title page"
  99.         ]
  100.       },
  101.       "width": 3204,
  102.       "height": 4613,
  103.       "items": [
  104.         {
  105.           "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/page/p3/1",
  106.           "type": "AnnotationPage",
  107.           "items": [
  108.             {
  109.               "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/annotation/p0003-image",
  110.               "type": "Annotation",
  111.               "motivation": "painting",
  112.               "body": {
  113.                 "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f20/full/max/0/default.jpg",
  114.                 "type": "Image",
  115.                 "format": "image/jpeg",
  116.                 "width": 3204,
  117.                 "height": 4613,
  118.                 "service": [
  119.                   {
  120.                     "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f20",
  121.                     "type": "ImageService3",
  122.                     "profile": "level1"
  123.                   }
  124.                 ]
  125.               },
  126.               "target": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p3"
  127.             }
  128.           ]
  129.         }
  130.       ]
  131.     },
  132.     {
  133.       "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p4",
  134.       "type": "Canvas",
  135.       "label": {
  136.         "en": [
  137.           "Blank page"
  138.         ]
  139.       },
  140.       "width": 3174,
  141.       "height": 4578,
  142.       "items": [
  143.         {
  144.           "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/page/p4/1",
  145.           "type": "AnnotationPage",
  146.           "items": [
  147.             {
  148.               "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/annotation/p0004-image",
  149.               "type": "Annotation",
  150.               "motivation": "painting",
  151.               "body": {
  152.                 "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f21/full/max/0/default.jpg",
  153.                 "type": "Image",
  154.                 "format": "image/jpeg",
  155.                 "width": 3174,
  156.                 "height": 4578,
  157.                 "service": [
  158.                   {
  159.                     "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f21",
  160.                     "type": "ImageService3",
  161.                     "profile": "level1"
  162.                   }
  163.                 ]
  164.               },
  165.               "target": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p4"
  166.             }
  167.           ]
  168.         }
  169.       ]
  170.     },
  171.     {
  172.       "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p5",
  173.       "type": "Canvas",
  174.       "label": {
  175.         "en": [
  176.           "Bookplate"
  177.         ]
  178.       },
  179.       "width": 3198,
  180.       "height": 4632,
  181.       "items": [
  182.         {
  183.           "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/page/p5/1",
  184.           "type": "AnnotationPage",
  185.           "items": [
  186.             {
  187.               "id": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/annotation/p0005-image",
  188.               "type": "Annotation",
  189.               "motivation": "painting",
  190.               "body": {
  191.                 "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f22/full/max/0/default.jpg",
  192.                 "type": "Image",
  193.                 "format": "image/jpeg",
  194.                 "width": 3198,
  195.                 "height": 4632,
  196.                 "service": [
  197.                   {
  198.                     "id": "https://iiif.io/api/image/3.0/example/reference/59d09e6773341f28ea166e9f3c1e674f-gallica_ark_12148_bpt6k1526005v_f22",
  199.                     "type": "ImageService3",
  200.                     "profile": "level1"
  201.                   }
  202.                 ]
  203.               },
  204.               "target": "https://iiif.io/api/cookbook/recipe/0202-start-canvas/canvas/p5"
  205.             }
  206.           ]
  207.         }
  208.       ]
  209.     }
  210.   ]
  211. }

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