Inferring DataSet Relational Structure from XML
The relational structure, or schema, of a DataSet is made up of tables, columns, constraints, and relations. When loading a DataSet from XML, the schema can be predefined, or it can be created, either explicitly or through inference, from the XML being loaded. For more information about loading the schema and contents of a DataSet from XML, see Loading a DataSet from XML and Loading DataSet Schema Information from XML.
If the schema of a DataSet is being created from XML, the preferred method is to explicitly specify the schema using either the XML Schema definition language (XSD) (as described in Deriving DataSet Relational Structure from XML Schema (XSD)) or the XML-Data Reduced (XDR). If no XML Schema or XDR schema is available in the XML, the schema of the DataSet can be inferred from the structure of the XML elements and attributes.
Not all attributes present in an XML document should be included in the inference process. Namespace-qualified attributes can include metadata that is important for the XML document but not for the DataSet schema. Using InferXmlSchema, you can specify namespaces to be ignored during the inference process. For more information, see Loading DataSet Schema Information from XML.
In This Section
- Summary of the DataSet Schema Inference Process
- Provides a high-level summary of the rules for inferring the schema of a DataSet from XML.
- Inferring Columns
- Describes the XML elements and attributes that are inferred as table columns.
- Inferring Relationships
- Describes the DataRelation and ForeignKeyConstraint objects created for nested, inferred tables.
- Inferring Element Text
- Describes the columns that are created for text in XML elements, and explains when text in XML elements is ignored.
- Inference Limitations
- Discusses the limitations of schema inference.
Other ResourcesADO.NET Managed Providers and DataSet Developer Center