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    <h1>8. SQL Reference</h1>
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    <h2>8.14. CREATE XML SCHEMA Statement</h2>
		<div>
      <pre class="programlisting">
&lt;xml schema definition&gt; ::=
    CREATE XML SCHEMA &lt;text of schema&gt;
</pre>
    </div>
<p>
Virtuoso supports registering XML Schemas for use in
<a href="CREATETABLE.html#sqlrefcreattablewithschema">WITH SCHEMA</a>
constraint for column values. The statement contains the whole text of the schema as a
string constant, i.e. enclosed in single quotes. This is not the best possible syntax,
because single quotes inside the text of schema should be carefully quoted, but this is
de-facto standard. If the schema contains number of single quotes (e.g. attributes are
in single quotes instead of typically used double quotes), try a system stored procedure
<span class="computeroutput">
DB.DBA.SYS_CREATE_XML_SCHEMA (text_of_schema);
</span>
that will have the same effect, but is not portable.
</p>
<p>
In principle, you can register any valid XMLSchema, but some features can cause prohibitive loss of performance.
It is strongly advised to compose the schema as a &quot;standalone&quot; document that has no references to
external DTDs or external generic entities. It is also strongly advised to avoid xs:include and
xs:import directives. The only sort of external references that does not affect performance is
xs:include or xs:import of a registered &quot;sibling&quot; schema. They say that a schema X is a &quot;sibling&quot; of schema Y
if their target namespace URIs have identical protocol names and host names and differs only in local path,
and schema X imports Y using relative (not absolute!) URI that contain only relative path,
(no protocol and no host).
</p>
<a name="ex_CREATEXMLSCHEMA" />
    <div class="example">
      <div class="exampletitle">Registering Sibling Schemas</div>
<p>Two sibling schemas are registered here.
First statement registers an XMLSchema for &quot;http://www.example.com/parts&quot; target namespace.
Second statement registers an XMLSchema for &quot;http://www.example.com/jobs&quot; target namespace
that imports the first schema using relative URI.
The rest of statements demonstrate a single WITH SCHEMA constraint that
inspect elements of these two target namespaces.</p>
<div>
        <pre class="programlisting">
CREATE XML SCHEMA &#39;&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot; ?&gt;
&lt;xs:schema targetNamespace=&quot;http://www.example.com/parts&quot;
  xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot;
  xmlns:p=&quot;http://www.example.com/parts&quot;&gt;
   &lt;xs:element name=&quot;Part&quot;&gt;
      &lt;xs:complexType&gt;
         &lt;xs:choice minOccurs=&quot;0&quot; maxOccurs=&quot;unbounded&quot;&gt;
	   &lt;xs:element ref=&quot;p:Part&quot;/&gt;
	 &lt;/xs:choice&gt;
         &lt;xs:attribute name=&quot;ID&quot; type=&quot;xs:string&quot; use=&quot;required&quot; /&gt;
         &lt;xs:attribute name=&quot;Count&quot; type=&quot;xs:int&quot; use=&quot;optional&quot; /&gt;
         &lt;xs:attribute name=&quot;Type&quot; type=&quot;xs:string&quot; use=&quot;optional&quot; /&gt;
      &lt;/xs:complexType&gt;
   &lt;/xs:element&gt;
&lt;/xs:schema&gt;&#39;

CREATE XML SCHEMA &#39;&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot; ?&gt;
&lt;xs:schema targetNamespace=&quot;http://www.example.com/jobs&quot;
  xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot;
  xmlns:p=&quot;http://www.example.com/parts&quot;
  xmlns:j=&quot;http://www.example.com/jobs&quot;&gt;
   &lt;xs:import schemaLocation=&quot;parts&quot; /&gt;
   &lt;xs:element name=&quot;Job&quot;&gt;
      &lt;xs:complexType&gt;
         &lt;xs:sequence&gt;
	   &lt;xs:element ref=&quot;p:Part&quot;/&gt;
	 &lt;/xs:sequence&gt;
         &lt;xs:attribute name=&quot;JobID&quot; type=&quot;xs:string&quot; use=&quot;required&quot; /&gt;
      &lt;/xs:complexType&gt;
   &lt;/xs:element&gt;
&lt;/xs:schema&gt;&#39;

create table JOBS (
  PACK_ID integer primary key,
  CONTENT XMLType with schema (&#39;http://www.example.com/jobs&#39;, &#39;Job&#39;)
  )

insert into JOBS values (1, &#39;
&lt;j:Job xmlns:j=&quot;http://www.example.com/jobs&quot; xmlns:p=&quot;http://www.example.com/parts&quot; JobID=&quot;asmkeyboard&quot;&gt;
  &lt;p:Part xmlns:p=&quot;http://www.example.com/parts&quot; ID=&quot;keyboard&quot;&gt;
    &lt;p:Part Count=&quot;101&quot;/&gt;
    &lt;p:Part ID=&quot;body&quot;/&gt;
  &lt;/p:Part&gt;
&lt;/j:Job&gt;&#39;)

*** Error 42000: [Virtuoso Driver][Virtuoso Server]XML parser detected an error:
	ERROR  : Only 0 out of 1 required attributes are defined for element &lt;p:Part&gt;, e.g. the element has no attribute &#39;ID&#39;
at line 4 column 27 of &#39;(value to be placed in column DB.DBA.JOBS of CONTENT)&#39;
    &lt;p:Part Count=&quot;101&quot;/&gt;
-------------------------^

insert into JOBS values (2, &#39;
&lt;j:Job xmlns:j=&quot;http://www.example.com/jobs&quot; xmlns:p=&quot;http://www.example.com/parts&quot; JobID=&quot;asmkeyboard&quot;&gt;
  &lt;p:Part xmlns:p=&quot;http://www.example.com/parts&quot; ID=&quot;keyboard&quot;&gt;
    &lt;p:Part ID=&quot;key&quot; Count=&quot;101&quot;/&gt;
    &lt;p:Part ID=&quot;body&quot;/&gt;
  &lt;/p:Part&gt;
&lt;/j:Job&gt;&#39;);

</pre>
      </div>
</div>
<div class="note">
      <div class="notetitle">Note:</div>
<p>
There is no way to change a registered schema if it is used in some WITH SCHEMA constraint.
Double-check any schema before using it, because it may be hard to fix the error
later.
</p>
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