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Java Forum / General / March 2008

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Do you recognise this schema?

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Roedy Green - 27 Mar 2008 00:53 GMT
Here is a schema generated from the DTD for JNLP 6.

It looks similar to XSD, but not quite. What is it?

<?xml version="1.0" encoding="UTF-8" ?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<!-- Schema for a JNLP 6.0 -->

 <xs:element name="all-permissions" type="xs:string" />

 <xs:element name="applet-desc">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="param" minOccurs="0" maxOccurs="unbounded" />
     </xs:sequence>
     <xs:attribute name="height" type="xs:string" use="required" />
     <xs:attribute name="name" type="xs:string" use="required" />
     <xs:attribute name="main-class" type="xs:string" use="required"
/>
     <xs:attribute name="width" type="xs:string" use="required" />
     <xs:attribute name="documentbase" type="xs:string"
use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="application-desc">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="argument" minOccurs="0" maxOccurs="unbounded"
/>
     </xs:sequence>
     <xs:attribute name="main-class" type="xs:string" use="optional"
/>
   </xs:complexType>
 </xs:element>

 <xs:element name="argument">
   <xs:complexType mixed="true" />
 </xs:element>

 <xs:element name="association">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="description" minOccurs="0" />
       <xs:element ref="icon" minOccurs="0" />
     </xs:sequence>
     <xs:attribute name="extensions" type="xs:string" use="required"
/>
     <xs:attribute name="mime-type" type="xs:string" use="required"
/>
   </xs:complexType>
 </xs:element>

 <xs:element name="component-desc" type="xs:string" />

 <xs:element name="description">
   <xs:complexType mixed="true">
     <xs:attribute name="kind" use="optional">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="one-line" />
           <xs:enumeration value="short" />
           <xs:enumeration value="tooltip" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
   </xs:complexType>
 </xs:element>

 <xs:element name="desktop" type="xs:string" />

 <xs:element name="ext-download">
   <xs:complexType>
     <xs:attribute name="download" use="optional" default="eager">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="lazy" />
           <xs:enumeration value="eager" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
     <xs:attribute name="part" type="xs:string" use="optional" />
     <xs:attribute name="ext-part" type="xs:string" use="required" />
   </xs:complexType>
 </xs:element>

 <xs:element name="extension">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="ext-download" minOccurs="0"
maxOccurs="unbounded" />
     </xs:sequence>
     <xs:attribute name="version" type="xs:string" use="optional" />
     <xs:attribute name="href" type="xs:string" use="required" />
     <xs:attribute name="name" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="homepage">
   <xs:complexType>
     <xs:attribute name="href" type="xs:string" use="required" />
   </xs:complexType>
 </xs:element>

 <xs:element name="icon">
   <xs:complexType>
     <xs:attribute name="height" type="xs:string" use="optional" />
     <xs:attribute name="version" type="xs:string" use="optional" />
     <xs:attribute name="href" type="xs:string" use="required" />
     <xs:attribute name="size" type="xs:string" use="optional" />
     <xs:attribute name="kind" type="xs:string" use="optional" />
     <xs:attribute name="width" type="xs:string" use="optional" />
     <xs:attribute name="depth" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="information">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="title" />
       <xs:element ref="vendor" />
       <xs:element ref="homepage" minOccurs="0" />
       <xs:element ref="description" minOccurs="0"
maxOccurs="unbounded" />
       <xs:element ref="icon" minOccurs="0" maxOccurs="unbounded" />
       <xs:element ref="offline-allowed" minOccurs="0" />
       <xs:element ref="shortcut" minOccurs="0" />
       <xs:element ref="association" minOccurs="0" />
       <xs:element ref="related-content" minOccurs="0"
maxOccurs="unbounded" />
     </xs:sequence>
     <xs:attribute name="locale" type="xs:string" use="optional" />
     <xs:attribute name="platform" type="xs:string" use="optional" />
     <xs:attribute name="arch" type="xs:string" use="optional" />
     <xs:attribute name="os" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="installer-desc">
   <xs:complexType>
     <xs:attribute name="main-class" type="xs:string" use="optional"
/>
   </xs:complexType>
 </xs:element>

 <xs:element name="j2ee-application-client-permissions"
type="xs:string" />

 <xs:element name="j2se">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="resources" minOccurs="0"
maxOccurs="unbounded" />
     </xs:sequence>
     <xs:attribute name="version" type="xs:string" use="required" />
     <xs:attribute name="href" type="xs:string" use="optional" />
     <xs:attribute name="max-heap-size" type="xs:string"
use="optional" />
     <xs:attribute name="java-vm-args" type="xs:string"
use="optional" />
     <xs:attribute name="initial-heap-size" type="xs:string"
use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="jar">
   <xs:complexType>
     <xs:attribute name="main" use="optional" default="false">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="true" />
           <xs:enumeration value="false" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
     <xs:attribute name="download" use="optional" default="eager">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="eager" />
           <xs:enumeration value="lazy" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
     <xs:attribute name="version" type="xs:string" use="optional" />
     <xs:attribute name="href" type="xs:string" use="required" />
     <xs:attribute name="part" type="xs:string" use="optional" />
     <xs:attribute name="size" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="java">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="resources" minOccurs="0"
maxOccurs="unbounded" />
     </xs:sequence>
     <xs:attribute name="version" type="xs:string" use="required" />
     <xs:attribute name="href" type="xs:string" use="optional" />
     <xs:attribute name="max-heap-size" type="xs:string"
use="optional" />
     <xs:attribute name="java-vm-args" type="xs:string"
use="optional" />
     <xs:attribute name="initial-heap-size" type="xs:string"
use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="jnlp">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="information" maxOccurs="unbounded" />
       <xs:element ref="security" minOccurs="0" />
       <xs:element ref="update" minOccurs="0" />
       <xs:element ref="resources" minOccurs="0"
maxOccurs="unbounded" />
       <xs:choice>
         <xs:element ref="application-desc" />
         <xs:element ref="applet-desc" />
         <xs:element ref="component-desc" />
         <xs:element ref="installer-desc" />
       </xs:choice>
     </xs:sequence>
     <xs:attribute name="version" type="xs:string" use="optional" />
     <xs:attribute name="href" type="xs:string" use="optional" />
     <xs:attribute name="spec" type="xs:string" use="optional" />
     <xs:attribute name="codebase" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="menu">
   <xs:complexType>
     <xs:attribute name="submenu" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="nativelib">
   <xs:complexType>
     <xs:attribute name="download" use="optional" default="eager">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="eager" />
           <xs:enumeration value="lazy" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
     <xs:attribute name="version" type="xs:string" use="optional" />
     <xs:attribute name="href" type="xs:string" use="required" />
     <xs:attribute name="part" type="xs:string" use="optional" />
     <xs:attribute name="size" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="offline-allowed" type="xs:string" />

 <xs:element name="package">
   <xs:complexType>
     <xs:attribute name="recursive" use="optional" default="false">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="true" />
           <xs:enumeration value="false" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
     <xs:attribute name="part" type="xs:string" use="required" />
     <xs:attribute name="name" type="xs:string" use="required" />
   </xs:complexType>
 </xs:element>

 <xs:element name="param">
   <xs:complexType>
     <xs:attribute name="name" type="xs:string" use="required" />
     <xs:attribute name="value" type="xs:string" use="required" />
   </xs:complexType>
 </xs:element>

 <xs:element name="property">
   <xs:complexType>
     <xs:attribute name="name" type="xs:string" use="required" />
     <xs:attribute name="value" type="xs:string" use="required" />
   </xs:complexType>
 </xs:element>

 <xs:element name="related-content">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="title" minOccurs="0" />
       <xs:element ref="description" minOccurs="0" />
       <xs:element ref="icon" minOccurs="0" />
     </xs:sequence>
     <xs:attribute name="href" type="xs:string" use="required" />
   </xs:complexType>
 </xs:element>

 <xs:element name="resources">
   <xs:complexType>
     <xs:choice>
       <xs:element ref="java" />
       <xs:element ref="j2se" />
       <xs:element ref="jar" />
       <xs:element ref="nativelib" />
       <xs:element ref="extension" />
       <xs:element ref="property" />
       <xs:element ref="package" />
     </xs:choice>
     <xs:attribute name="locale" type="xs:string" use="optional" />
     <xs:attribute name="arch" type="xs:string" use="optional" />
     <xs:attribute name="os" type="xs:string" use="optional" />
   </xs:complexType>
 </xs:element>

 <xs:element name="security">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="all-permissions" minOccurs="0" />
       <xs:element ref="j2ee-application-client-permissions"
minOccurs="0" />
     </xs:sequence>
   </xs:complexType>
 </xs:element>

 <xs:element name="shortcut">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="desktop" minOccurs="0" />
       <xs:element ref="menu" minOccurs="0" />
     </xs:sequence>
     <xs:attribute name="online" use="optional" default="true">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="true" />
           <xs:enumeration value="false" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
   </xs:complexType>
 </xs:element>

 <xs:element name="title">
   <xs:complexType mixed="true" />
 </xs:element>

 <xs:element name="update">
   <xs:complexType>
     <xs:attribute name="check" use="optional" default="timeout">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="always" />
           <xs:enumeration value="timeout" />
           <xs:enumeration value="background" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
     <xs:attribute name="policy" use="optional" default="always">
       <xs:simpleType>
         <xs:restriction base="xs:NMTOKEN">
           <xs:enumeration value="always" />
           <xs:enumeration value="prompt-update" />
           <xs:enumeration value="prompt-run" />
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
   </xs:complexType>
 </xs:element>

 <xs:element name="vendor">
   <xs:complexType mixed="true" />
 </xs:element>

</xs:schema>
Signature


Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

Reply to this Message
Arne Vajhøj - 27 Mar 2008 02:10 GMT
> Here is a schema generated from the DTD for JNLP 6.
>
> It looks similar to XSD, but not quite. What is it?

Which part is not valid W3C XML Schema ?

Arne
Reply to this Message
Roedy Green - 27 Mar 2008 11:24 GMT
>Which part is not valid W3C XML Schema ?

The XSD schema have for JNLP 1.0 has  <xsd all over instead of <xs

What is the difference?
Signature


Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

Reply to this Message
Lew - 27 Mar 2008 13:45 GMT
>> Which part is not valid W3C XML Schema ?
>
> The XSD schema have for JNLP 1.0 has  <xsd all over instead of <xs
>
> What is the difference?

The namespace prefix, the part prior to the colon in each element tag, is set
within the document itself and is arbitrary.  The prefix is a local alias to
the full namespace.  If the prefixes differ but alias the same namespace, then
they are the same namespace.

The root element of the schema you posted is:
  <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

This "xmlns:xs=" attribute sets the _XML_ _n_ame_s_pace prefix 'xs' to alias
the 'http://www.w3.org/2001/XMLSchema' namespace.

'xsd' and 'xs' are both conventional XML Schema prefixes.

Signature

Lew

Reply to this Message
Owen Jacobson - 27 Mar 2008 15:46 GMT
On Mar 27, 6:24 am, Roedy Green <see_webs...@mindprod.com.invalid>
wrote:

> >Which part is not valid W3C XML Schema ?
>
> The XSD schema have for JNLP 1.0 has  <xsd all over instead of <xs
>
> What is the difference?

None whatsoever.  Namespace prefixes are intended for human
consumption; correctly-written tools will map tags to element
definitions (from schemas, etc) using the namespace URI, not the
prefix.

In the schema you posted, the root element looks like:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<!-- ... -->
</xs:schema>

The xmlns:xs attribute binds the 'xs' namespace prefix to the URL
'http://www.w3.org/2001/XMLSchema'.  It could just as easily have been
xmlns:xsd and the element itself <xsd:schema>, or just xmlns
(no :prefix), and <schema>, which is my own preference.  The document
would be the same in all three cases.

-o
Reply to this Message
Mark Space - 27 Mar 2008 20:45 GMT
> None whatsoever.  Namespace prefixes are intended for human
> consumption; correctly-written tools will map tags to element

Huh.  I'm not sure about the "human consumption" part.  I was under the
impression that prefix were added to prevent name collisions.  If your
XML file uses an element <name> and my XML file does too, then
namespaces provide a means for the top level document to distinguish
between them.  And I mean programmatically, not people.

I suspect you knew this, your phrasing sounded off though.
Reply to this Message
Arne Vajhøj - 27 Mar 2008 21:38 GMT
>> None whatsoever.  Namespace prefixes are intended for human
>> consumption; correctly-written tools will map tags to element
[quoted text clipped - 6 lines]
>
> I suspect you knew this, your phrasing sounded off though.

I think he meant that the choice of namespace prefix is for
human consumption.

Namespaces are definitely not.

Arne
Reply to this Message
Arne Vajhøj - 27 Mar 2008 21:40 GMT
>> Which part is not valid W3C XML Schema ?
>
> The XSD schema have for JNLP 1.0 has  <xsd all over instead of <xs
>
> What is the difference?

As other already have stated then there are no difference.

The author of the XML decide which prefix he would like to
use for each namespace.

xsd and xs are both commonly used for http://www.w3.org/2001/XMLSchema.

I prefer xsd, but ...

Arne
Reply to this Message
Owen Jacobson - 27 Mar 2008 02:52 GMT
On Mar 26, 7:53 pm, Roedy Green <see_webs...@mindprod.com.invalid>
wrote:
> Here is a schema generated from the DTD for JNLP 6.
>
[quoted text clipped - 288 lines]
>
> read more »

It *is* XSD.  However, the DTD->XSD translation has (sensibly enough)
translated all the <!ELEMENT DTD components into top-level <element>
components in the schema, resulting in a schema with many anonymous
complex types and many top-level elements, which is unusual (IME).

A more idiomatic translation would have many named complex types and
one or a very few top-level elements.  This schema allows for, eg., a
document composed only of

<param name="x" value="y" />

to be valid.
Reply to this Message


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