TYPED AND UNTYPED XML XQuery engine because you

TYPED AND UNTYPED XML XQuery engine because you are using typed data in the query. It also allows the XQuery engine to know the data type of its intermediate and final results. If the XML data is not strongly typed, XQuery treats everything as a weakly typed string called xdt:untypedAtomic. The integrity checking for a typed XML column happens each time a new value is set into it. This would occur when you are inserting or updating the column into a table. As an example, creating the following table and adding some rows to it will cause each instance of the XMLdata type to be schema-validated at insert time. CREATE TABLE person_tab( id INT IDENTITY PRIMARY KEY, the person column can only contain infoset items that are defined in the schema collection defined above person XML(peoplecoll)) GO this works, person between 0 and 30 years old INSERT INTO person_tab VALUES( 11 ) so does this, using the no-namespace schema INSERT INTO person_tab VALUES( 75 ) this insert fails INSERT INTO person_tab VALUES( 31 ) You can precede your schema collection identifier with the keywords DOCUMENTor CONTENT. If you do not use one of these keywords, the default is equivalent to specifying CONTENT. If DOCUMENT is specified, the column can only contain XML documents (a document is defined as having a single root element), but if you specify CONTENT, the column can contain documents or fragments, as long as all the elements are schema-valid. Here s an example that illustrates the difference. CREATE TABLE person_docs( id INT IDENTITY primary key, person XML(DOCUMENT peoplecoll)) GO CREATE TABLE person_content( id INT IDENTITY PRIMARY KEY, person XML(CONTENT peoplecoll)) GO

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