| 1 | # Untitled string in MDAST Schema
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| 2 |
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| 3 | ```txt
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| 4 | https://ns.adobe.com/helix/pipeline/mdast#/properties/url
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| 5 | ```
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| 6 |
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| 7 | For resources, an url field must be present. It represents a URL to the referenced resource.
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| 8 |
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| 9 |
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| 10 | | Abstract | Extensible | Status | Identifiable | Custom Properties | Additional Properties | Access Restrictions | Defined In |
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| 11 | | :------------------ | ---------- | -------------- | ----------------------- | :---------------- | --------------------- | ------------------- | --------------------------------------------------------------- |
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| 12 | | Can be instantiated | No | Unknown status | Unknown identifiability | Forbidden | Allowed | none | [mdast.schema.json\*](mdast.schema.json "open original schema") |
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| 13 |
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| 14 | ## url Type
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| 15 |
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| 16 | `string`
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| 17 |
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| 18 | ## url Constraints
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| 19 |
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| 20 | **URI reference**: the string must be a URI reference, according to [RFC 3986](https://tools.ietf.org/html/rfc4291 "check the specification")
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