Maximum length for an XML schema

Question

Hi everybody,
Is there a limit on the maximum length for an XML schema? I am trying to register an XML schema using dbms_xmlschema.registerSchema(). The schema registration process seems to go fine when the length of the schema is short. But the registration process always hangs when I increase the XML schema with additional types/elements. Is there a limit on the maximum length of the XML schema with regards to registering it to Oracle?
Thanks!
IK

Answer 1

Hi Erhan,
Let's say I have a really big XML schema in file "schemaA.xsd", like so:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sampleA="http://abc.com/schemaA" targetNamespace="http://abc.com/schemaA">
<xsd:element name="Employee">
<xsd:sequence>
<xsd:element name="Address" type="sampleA:AddressType"/>
<xsd:element name="Contact" type="sampleA:ContactInfoType"/>
</xsd:element>
<xsd:complexType name="AddressType">......</xsd:complexType>
<xsd:complexType name="ContactInfoType">....</xsd:complexType>
</xsd:schema>
I can separate this schema into multiple smaller schemas (<32KB) by using the proper imports:
In file "sampleA.xsd":
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sampleB="http://abc.com/schemaB"
xmlns:sampleA="http://abc.com/schemaA" targetNamespace="http://abc.com/schemaA">
<xsd:import namespace="http://abc.com/schemaB" schemaLocation="schemaB.xsd"/>
<xsd:element name="Employee">
<xsd:sequence>
<xsd:element name="Address" type="sampleB:AddressType"/>
<xsd:element name="Contact" type="sampleB:ContactInfoType"/>
</xsd:element>
</xsd:schema>
And in file "sampleB.xsd", I might have something like this:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sampleB="http://abc.com/schemaB" targetNamespace="http://abc.com/schemaB">
<xsd:complexType name="AddressType">......</xsd:complexType>
<xsd:complexType name="ContactInfoType">....</xsd:complexType>
</xsd:schema>
So, you see how I have separated that one really big XML schema in file "schemaA.xsd" into two XML schema files: "schemaA.xsd" and "schemaB.xsd". Also, I have added <import> tags in schemaA.xsd to refer to elements, complext types, etc. defined in schemaB.xsd. So long as these schema files are < 32KB, I can register them (using dbms_xmlschema.registerSchema()) without any problems into Oracle.
Let me know if what I said above is not too clear. Hope you find your solution soon!
Thanks!
Irene