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annotate env/lib/python3.7/site-packages/schema_salad/metaschema/import_include.md @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 ## Import
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2
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3 During preprocessing traversal, an implementation must resolve `$import`
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4 directives. An `$import` directive is an object consisting of exactly one
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5 field `$import` specifying resource by URI string. It is an error if there
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6 are additional fields in the `$import` object, such additional fields must
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7 be ignored.
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8
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9 The URI string must be resolved to an absolute URI using the link
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10 resolution rules described previously. Implementations must support
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11 loading from `file`, `http` and `https` resources. The URI referenced by
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12 `$import` must be loaded and recursively preprocessed as a Salad document.
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13 The external imported document does not inherit the context of the
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14 importing document, and the default base URI for processing the imported
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15 document must be the URI used to retrieve the imported document. If the
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16 `$import` URI includes a document fragment, the fragment must be excluded
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17 from the base URI used to preprocess the imported document.
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18
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19 Once loaded and processed, the `$import` node is replaced in the document
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20 structure by the object or array yielded from the import operation.
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21
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22 URIs may reference document fragments which refer to specific an object in
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23 the target document. This indicates that the `$import` node must be
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24 replaced by only the object with the appropriate fragment identifier.
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25
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26 It is a fatal error if an import directive refers to an external resource
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27 or resource fragment which does not exist or is not accessible.
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28
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29 ### Import example
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30
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31 import.yml:
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32 ```
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33 {
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34 "hello": "world"
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35 }
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36
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37 ```
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38
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39 parent.yml:
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40 ```
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41 {
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42 "form": {
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43 "bar": {
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44 "$import": "import.yml"
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45 }
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46 }
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47 }
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48
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49 ```
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50
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51 This becomes:
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52
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53 ```
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54 {
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55 "form": {
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56 "bar": {
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57 "hello": "world"
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58 }
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59 }
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60 }
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61 ```
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62
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63 ## Include
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64
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65 During preprocessing traversal, an implementation must resolve `$include`
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66 directives. An `$include` directive is an object consisting of exactly one
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67 field `$include` specifying a URI string. It is an error if there are
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68 additional fields in the `$include` object, such additional fields must be
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69 ignored.
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70
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71 The URI string must be resolved to an absolute URI using the link
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72 resolution rules described previously. The URI referenced by `$include` must
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73 be loaded as a text data. Implementations must support loading from
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74 `file`, `http` and `https` resources. Implementations may transcode the
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75 character encoding of the text data to match that of the parent document,
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76 but must not interpret or parse the text document in any other way.
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77
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78 Once loaded, the `$include` node is replaced in the document structure by a
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79 string containing the text data loaded from the resource.
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80
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81 It is a fatal error if an import directive refers to an external resource
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82 which does not exist or is not accessible.
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83
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84 ### Include example
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85
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86 parent.yml:
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87 ```
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88 {
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89 "form": {
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90 "bar": {
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91 "$include": "include.txt"
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92 }
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93 }
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94 }
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95
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96 ```
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97
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98 include.txt:
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99 ```
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100 hello world
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101
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102 ```
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103
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104 This becomes:
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105
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106 ```
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107 {
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108 "form": {
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109 "bar": "hello world"
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110 }
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111 }
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112 ```