Unexpected table created after schema registration

Question

I registered the following xsd. Even though I did not specify any tables to be created, I see a table in "user_xml_tables". Could someone explain what's going on? Thank you.
1. This is the xsd file.
<xsd:schema version="1.0" xdb:storeVarrayAsTable="false" xdb:mapUnboundedStringToLob="false" xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:complexType name="val_type">
<xsd:sequence>
<xsd:element name="e1" type="xsd:integer" />
<xsd:element name="e2" type="xsd:integer" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="coll5_type" xdb:SQLType="coll5_sqltype">
<xsd:sequence >
<xsd:element name="val" type="val_type" maxOccurs="200"
xdb:SQLInline="false"/>
<xsd:element name="val2" type="xsd:integer" xdb:SQLType=
"INTEGER" />
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
2.Register the schema
BEGIN
DBMS_XMLSCHEMA.registerSchema(
SCHEMAURL => 'http://oracle.com/xdb/coll2.xsd',
SCHEMADOC => bfilename('TICKERDIR','coll2.xsd'),
LOCAL =>TRUE,
GENTYPES => TRUE,
GENTABLES => TRUE,
CSID => nls_charset_id('AL32UTF8'));
END;
3. ************ Why is this table created? ******************************************
SQL> select table_name from user_xml_tables;
TABLE_NAME
val777_TAB
SQL> desc "val777_TAB"
Name Null? Type
TABLE of SYS.XMLTYPE(XMLSchema "http://bloomberg.com/xdb/coll2.xsd" Element "val") STORAGE Object-relational TYPE "val_type776_T"
SQL> desc "val_type776_T"
"val_type776_T" is NOT FINAL
Name Null? Type
SYS_XDBPD$ XDB.XDB$RAW_LIST_T
e1 NUMBER(38)
e2 NUMBER(38)

Answer 1

I do not think this is because GENTABLES=> TRUE is set.
1. Note that for the posted schema, a table is created only for coll5_type, but not val_type.
2. I modifed the schema as follows (see below): Its the same as the original except that we have two additional complex types, we still have ONE table that is generated. We should expect THREE tables to be generated if the expected behaviour of GENTABLES=> TRUE is to create tables for every complexType.
3. If you remove coll5_type from the modified schema, there are NO tables generated.
Conclusion: the table is generated only if the complexType has a collection with SQLInline="false" : i.e. we require a varray of REF storage.
What's the reason for this behaviour?
1. Here's the modified xsd:
This schema has:
a) has 3 complex types defined
b). no global elements (tables are supposed to be generated only for global elements)
3. no tables have been specified in the xsd.
<?xml version="1.0" encoding="windows-1252"?>
<xsd:schema version="1.0" xdb:storeVarrayAsTable="false" xdb:mapUnboundedStringT
oLob="false" xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsd="http://www.w3.or
g/2001/XMLSchema">
<xsd:complexType name="val_type">
<xsd:sequence>
<xsd:element name="e1" type="xsd:integer" />
<xsd:element name="e2" type="xsd:integer" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="coll3_type" xdb:SQLType="coll3_sqltype">
<xsd:sequence >
<xsd:element name="val" type="val_type" xdb:SQLCollType=
"coll3_sqlcolltype" maxOccurs="200"/>
<xsd:element name="val2" type="xsd:integer" xdb:SQLType=
"INTEGER" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="coll4_type" xdb:SQLType="coll4_sqltype">
<xsd:sequence >
<xsd:element name="val" type="val_type" maxOccurs="200"
xdb:SQLCollType="CLOB" />
<xsd:element name="val2" type="xsd:integer" xdb:SQLType=
"INTEGER" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="coll5_type" xdb:SQLType="coll5_sqltype">
<xsd:sequence >
<xsd:element name="val" type="val_type" maxOccurs="200"
xdb:SQLInline="false"/>
<xsd:element name="val2" type="xsd:integer" xdb:SQLType=
"INTEGER" />
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
2.
BEGIN
DBMS_XMLSCHEMA.registerSchema(
SCHEMAURL => 'http://bloomberg.com/xdb/coll2.xsd',
SCHEMADOC => bfilename('TICKERDIR','coll2.xsd'),
LOCAL =>TRUE,
GENTYPES => TRUE,
GENTABLES => TRUE,
CSID => nls_charset_id('AL32UTF8'));
END;
3.
SQL> select table_name from user_xml_tables;
TABLE_NAME
val779_TAB