embedding schema in the xml document..

marcus

Hi All,

I'm new to xml world and i was looking for a way
to embed the xml schema info in the xml document
itself. i tried the following:

--- xml schema + document combined ---

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace ="http://www.w3schools.c om"
xmlns="http://www.w3schools.c om"
elementFormDefa ult="qualified" >

<xs:element name="note">
<xs:complexType >
<xs:sequence>
<xs:element name="to" type="xs:string "/>
<xs:element name="from" type="xs:string "/>
<xs:element name="heading" type="xs:string "/>
<xs:element name="body" type="xs:string "/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

<?xml version="1.0"?>

<note
xmlns="http://www.w3schools.c om"
xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocat ion="http://www.w3schools.c om">

<to>Registrar </to>
<from>Student </from>
<heading>Remind er</heading>
<body>Transcrip ts requested ASAP</body>
</note>

-----

is this a valid thing to do ? xerces parser will not
parse the above xml. if i put the schema in another file
and refer the xsi:schemaLocat ion to the xsd file, the
parsing goes fine.

any help is greatly appreciated..

//marc

Jul 20 '05 #1

Subscribe Reply

4980

Martin Honnen

marcus wrote:

I'm new to xml world and i was looking for a way
to embed the xml schema info in the xml document
itself. i tried the following:

--- xml schema + document combined ---

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace ="http://www.w3schools.c om"
xmlns="http://www.w3schools.c om"
elementFormDefa ult="qualified" >

<xs:element name="note">
<xs:complexType >
<xs:sequence>
<xs:element name="to" type="xs:string "/>
<xs:element name="from" type="xs:string "/>
<xs:element name="heading" type="xs:string "/>
<xs:element name="body" type="xs:string "/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

<?xml version="1.0"?>

<note
xmlns="http://www.w3schools.c om"
xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocat ion="http://www.w3schools.c om">

<to>Registrar </to>
<from>Student </from>
<heading>Remind er</heading>
<body>Transcrip ts requested ASAP</body>
</note>

-----

is this a valid thing to do ? xerces parser will not
parse the above xml. if i put the schema in another file
and refer the xsi:schemaLocat ion to the xsd file, the
parsing goes fine.

What you have is not even well-formed as only one XML declaration
followed by exactly one root element is allowed.
I don't think it makes much sense to embed an XML schema into an
instance document.

--

Martin Honnen
http://JavaScript.FAQTs.com/

Jul 20 '05 #2

marcus

Martin Honnen wrote:

What you have is not even well-formed as only one XML declaration
followed by exactly one root element is allowed.
I don't think it makes much sense to embed an XML schema into an
instance document.

the scenario is: an emdedded device has its server hold
the device config as a dom document inmemory. clients
across network can request device to change its config
by providing xml dom subtree that needs to be changed.

the idea was to send the schema of the subtree (as the
device config is made of small schema docs each referring
to the subtree that could be changed) along with the
server response so the clinets donot have to maintian
a list of schema docs.

from your description it looks like clients across the
nework would have to maintain the schema locally as
the device does not the computing power to serve the
schema docs over network.

any thoughts/comments/suggestions ?

Thanks !
//marc

Jul 20 '05 #3

Toivo Lainevool

marcus <mc*****@notick et.org> wrote in message >

the scenario is: an emdedded device has its server hold
the device config as a dom document inmemory. clients
across network can request device to change its config
by providing xml dom subtree that needs to be changed.

One option would be to use a DTD instead of W3C XML Schema. DTD can be
embedded into the document.

Toivo Lainevool
http://www.XMLPatterns.com - Develop effective DTDs and XML Schema
documents for your XML using structural design patterns.

Jul 20 '05 #4

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