The leaf element provides the information needed to locate an external document file referenced in the ODM document.
| Element Name | Leaf |
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| Parent Elements | MetaDataVersion, ItemGroupDef |
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| Element XPath(s) | /ODM/Study/MetaDataVersion/Leaf /ODM/Study/MetaDataVersion/ItemGroupDef/Leaf |
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| Element Textual Value | None |
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| Attributes | ID, xlink:href |
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| Child Elements | (Title) |
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| Usage/Business Rules | - Business Rules(s):
- One for each distinct document file referenced by a DocumentRef element and one for each dataset file referenced by a ArchiveLocationOID attribute in an itemGroupDef element
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| Attribute | Schema Datatype or Enumeration | Usage | Definition | Business Rule(s) |
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| ID | The Leaf ID is based on the XML xs:ID datatype, which is a Non-Colonized Name; therefore, ID attributes must start with either a letter or underscore (_), and may contain only letters, digits, underscores, hyphens and periods. | Required | - Unique ID for the Leaf. See Section 2.13, Element Identifiers and References, for OID considerations.
- Business Rule: Leaf ID attributes must be unique within the ODM document (i.e., there can be no 2 Leaf elements with the same ID attribute).
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| xlink:href | | Required | - URL that can be used to identify the location of a document or dataset file relative to the folder containing the ODM file. If the file is not located in the same folder as the ODM file, a relative file path should be included.
- Business Rule: For regulatory submissions to the FDA, the locations specified have to conform to locations allowed in the eCTD, in the Technical Conformance Guide for the relevant regulatory authority and the study data specifications.
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