ORA-02348: cannot create VARRAY column with embedded LOB

Question

Hi
This error message I get when I try to create a table from my schema file which has a (sub-) element of type CLOB.
In my XML document I have an element which needs to become declared a CLOB (because it's > 4000 bytes), in my Schema I define it's element node like:
<xs:element name="MocovuState" xdb:SQLType="CLOB">
I can register this Schema file but when I create the table, I get the error:
ORA-02348: cannot create VARRAY column with embedded LOB
Does anybody know how to handle this ?
Marcel

Answer 1

You need to use the xdb:storeVarrayAsTable="true" schema annotation so that unbounded elements are created at schema registration time as nested tables. Varrays can not contain CLOBs/BLOBS. Use the schema annotation xdb:SQLType="CLOB" to tell Oracle XMLDB to use CLOB storage for the element. See your schema below:
P.S. XMLSPY is invaluable as it supports Oracle XML Schema annotations.
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb" targetNamespace="http://www.yourregisteredschemanamespace.com" elementFormDefault="qualified" attributeFormDefault="unqualified" xdb:storeVarrayAsTable="true">
     <xs:element name="nRootNode">
          <xs:complexType>
               <xs:all>
                    <xs:element name="nID" type="xs:long"/>
                    <xs:element name="nStringGroup" type="nStringGroup" minOccurs="0"/>
               </xs:all>
          </xs:complexType>
     </xs:element>
     <xs:complexType name="nStringGroup">
          <xs:sequence>
               <xs:element name="nString" type="nString" minOccurs="0" maxOccurs="unbounded"/>
          </xs:sequence>
     </xs:complexType>
     <xs:complexType name="nString" xdb:SQLType="CLOB">
          <xs:sequence>
               <xs:element name="nValue" type="nValue" minOccurs="0" xdb:SQLType="CLOB"/>
          </xs:sequence>
          <xs:attribute name="id" type="xs:long" use="required"/>
     </xs:complexType>
     <xs:simpleType name="nValue">
          <xs:restriction base="xs:string">
               <xs:minLength value="1"/>
          </xs:restriction>
     </xs:simpleType>
</xs:schema>