3. Limitations related to DTD support
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### 3. Limitations related to DTD support

Formal reference: Extensible Markup Language (XML) 1.1.

Constraints on XML instances which are not checked:

- Validity constraint: Root Element Type. The Name in the document type declaration must match the element type of the root element.

- Entity Name: an attribute value of type ENTITY or ENTITIES must match the name of an unparsed entity declared in the DTD.

Constraints on DTDs which are not checked:

- Notation Declared: in an unparsed entity, the name after NDATA must match the declared name of a notation.

- Standalone Document Declaration.

- Proper Declaration/PE Nesting.

- Proper Group/PE Nesting.

- Proper Conditional Section/PE Nesting.

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