feature/use-case-acceptance-tests-2 #117
@ -76,9 +76,16 @@ Use `${...}` for placeholders which need to be replaced with JSON quotes
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`%{...}` for placeholders which need to be rendered raw
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and `&{...}` for placeholders which need to get URI-encoded.
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If `???` is added before the closing brace, the property is optional.
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This means, if it's not available in the properties, `null` is used.
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Properties with null-values are removed from the JSON.
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If you need to keep a null-value, e.g. to delete a property,
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use `NULL` (all caps).
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use `NULL` (all caps) in the template (not the variable value).
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A special syntax is the infix `???`-operator like in: `${%{var1???}???%{var2???}%{var3???}}`.
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In this case the first non-null value is used.
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### The Use-Case Verification
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