XML / XSL Discussion Boards

led mike19-Jun-09 5:15

19-Jun-09 5:15

Just a hint for using CodeProject. When someone like Stuart replies to you, don't vote down their reply. If you don't like what they say just ignore it, otherwise vote favorably and thank them for the free help they gave you.

Re: xml menubar

Stuart Dootson19-Jun-09 12:47

Stuart Dootson

19-Jun-09 12:47

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Use same objects to access DB and WebService

the_jat18-Jun-09 3:57

the_jat

18-Jun-09 3:57

Hello All,

Is there a way that I can create objects that will allow me to access DB(like edmx) and use the same objects in webservice
also, How good are Persistence Ignorance (POCO) Adapter for Entity Framework[^] Web Service Software Factory: Modeling Edition[^] for the solution.

Thanks

Cross Posted

led mike18-Jun-09 5:19

led mike

18-Jun-09 5:19

Detect Invalid sequence of tag in XML document using schema.

tprakash17-Jun-09 21:35

tprakash

17-Jun-09 21:35

I have xml tags as below.

file1.xml

<Roles>
<Role>
<Permissions>Admin<Permissions/>
<Permissions>Reader<Permissions/>
</Role>
</Roles>

Here is my XSD to validate above xml

myXSD.xsd

<element name="Roles">
<complexType>
<sequence>
<element ref="Role">
</sequence>
</complexType>
</element>

<element name ="Role">
<complexType>
<sequence>
<element ref ="Permissions" minOccurs="1" maxOccurs="unbounded" />
</sequence>
</complexType>
</element>

<element name ="Permissions">
<complexType>
<sequence>
<element name ="Permission" type="string" />
</sequence/>
</complexType/>
</element/>

This XSD validation works fine in normal case. If I change the xml file as below.

file2.xml

<Roles>
<Role>
<Permissions>Admin<Permissions/>
<Permissions>Reader<Permissions/>
</Role>
<Permissions>Reader<Permissions/>
</Roles>

ie. I inserted the <Permissions> immediately after the <Roles> parent node. This is invalid in my case. I want to enforce that <Permissions> node always comes inside the <Role> node but not <Roles> node.
I want to detect this such case using XSD validation.
Could you please suggest me how to write the correct XSD schema to invalidate file2.xml?

Thanks in advance

Prakash

Re: Detect Invalid sequence of tag in XML document using schema.

Stuart Dootson18-Jun-09 0:15

Stuart Dootson

18-Jun-09 0:15

Neither of your files should validate. I suspect your schema isn't parsing correctly, you're not checking errors and thinking that validation's happening.

Your problems?

You can't use the ref attribute of the element element without using some level of XML namespaces.
You've omitted the Permission elements from your sample files
Your closing Permissions tags are incorrect - I'll presume that's a typo

Here's an xsd/xml pair that does cause the validation error you want (at least with libxml2):

XSD file

<?xml version="1.0" encoding="utf-8"?>
<xs:schema
    targetNamespace="http://test-namespace.com/"
    xmlns="http://test-namespace.com/"
    xmlns:srd="http://test-namespace.com/"
    elementFormDefault="qualified" attributeFormDefault="unqualified"
    xmlns:xs="http://www.w3.org/2001/XMLSchema">

   <xs:element name="Roles">
      <xs:complexType>
         <xs:sequence>
            <xs:element ref ="Role"/>
         </xs:sequence>
      </xs:complexType>
   </xs:element>

   <xs:element name ="Role">
      <xs:complexType>
         <xs:sequence>
            <xs:element ref="Permissions"/>
         </xs:sequence>
      </xs:complexType>
   </xs:element>

   <xs:element name ="Permissions">
      <xs:complexType>
         <xs:sequence>
            <xs:element name ="Permission" type="xs:string" />
         </xs:sequence>
      </xs:complexType>
   </xs:element>


</xs:schema>

XML file

<?xml version="1.0" encoding="utf-8"?>
<Roles xmlns="http://test-namespace.com/">
   <Role>
      <Permissions>
         <Permission>Reader</Permission>
      </Permissions>
   </Role>
   <Permissions>
      <Permission>Reader</Permission>
   </Permissions>
</Roles>

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Detect Invalid sequence of tag in XML document using schema.

tprakash18-Jun-09 18:10

tprakash

18-Jun-09 18:10

Thank you very much.
It worked perfectly Smile | :)

Re: Detect Invalid sequence of tag in XML document using schema.

tprakash14-Jul-09 2:18

tprakash

14-Jul-09 2:18

Hi,

As you said we cannot use 'ref' attribute in xsd without using some level of xml namespace.
Can we write a schema file (xsd) to valid the xml without having xmlns?
Is there any other alternative to valid the xml without having xmlns?
I mean, can we write xsd to valid the following xml?
<?xml version="1.0" encoding="utf-8"?>
<Roles>
<Role>
<Permissions>
<Permission>Reader</Permission>
</Permissions>
</Role>
<Permissions>
<Permission>Reader</Permission>
</Permissions>
</Roles>

Thanks.

Prakash

Re: Detect Invalid sequence of tag in XML document using schema.

Stuart Dootson14-Jul-09 2:25

Stuart Dootson

14-Jul-09 2:25

a) what's the hassle with using XML namespaces? Really isn't that much trouble.
b) You can use something like this without namespaces. The references have effectively been manually resolved:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

   <xs:element name="Roles">
      <xs:complexType>
         <xs:sequence>
            <xs:element name ="Role">
               <xs:complexType>
                  <xs:sequence>
                     <xs:element name ="Permissions">
                        <xs:complexType>
                           <xs:sequence>
                              <xs:element name ="Permission" type="xs:string" />
                           </xs:sequence>
                        </xs:complexType>
                     </xs:element>
                  </xs:sequence>
               </xs:complexType>
            </xs:element>
         </xs:sequence>
      </xs:complexType>
   </xs:element>

</xs:schema>

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Detect Invalid sequence of tag in XML document using schema.

tprakash14-Jul-09 22:54

tprakash

14-Jul-09 22:54

a) The XML file I am validating is from my clients. They cannot bear any change modification on that xml because it is being used by many others clients. They already working on the format of that xml. If I add an xml namespace in the XML file, all of my clients have to change their logic to read the modified XML file. What I can do is to write the xsd file to validate that XML file. It wouldn't have been problem if I could use namespace.

I think your answer (b) will work for me.

Thank your great help.

Prakash

Re: Detect Invalid sequence of tag in XML document using schema.

Stuart Dootson15-Jul-09 0:27

Stuart Dootson

15-Jul-09 0:27

tprakash wrote:
The XML file I am validating is from my clients. They cannot bear any change modification on that xml because it is being used by many others clients

That I can understand. I presume your clients don't have a schema for their XML? In which case, what guarantees do you have that their XML will always match any schema you write? And how did they specify the XML format to you?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Detect Invalid sequence of tag in XML document using schema.

tprakash15-Jul-09 21:35

tprakash

15-Jul-09 21:35

Actually, we have two applications, one generates the xml, while other application consume the xml. The format of xml is defined by my management team. We have different clients using that applications(single only or both). And it is our management team decision not to change the format of the xml file. We just donot want to mesh up with that now. Otherwise, it is ok.

Re: Detect Invalid sequence of tag in XML document using schema.

tprakash14-Jul-09 23:13

tprakash

14-Jul-09 23:13

I think the solution (b) works perfectly in cases where we have normal xml node. What about if the a child xml node contains parent xml node recursively?
Taken the above case, what if Permissions node in turn contains the Roles ?
Since we cannot use ref attribute, how to refer the Roles node in the above xsd?

Thanks
Prakash

Re: Detect Invalid sequence of tag in XML document using schema.

Stuart Dootson15-Jul-09 0:42

Stuart Dootson

15-Jul-09 0:42

As I said in this message[^], I think I was wrong about not being able to use ref attributes. I'm not sure what was going on in my head that day Smile | :)

This schema validates your XML with libxml2 2.7.3 (which is a pretty recent release). I've put in the maxOccurs attribute of the sequence that contains the Permission element to enable multiple Permission elements in a Permissions element.

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

   <xs:element name="Roles">
      <xs:complexType>
         <xs:sequence>
            <xs:element ref ="Role"/>
         </xs:sequence>
      </xs:complexType>
   </xs:element>

   <xs:element name ="Role">
      <xs:complexType>
         <xs:sequence>
            <xs:element ref="Permissions"/>
         </xs:sequence>
      </xs:complexType>
   </xs:element>

   <xs:element name ="Permissions">
      <xs:complexType>
         <xs:sequence maxOccurs="unbounded">
            <xs:element name ="Permission" type="xs:string" />
         </xs:sequence>
      </xs:complexType>
   </xs:element>


</xs:schema>

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Detect Invalid sequence of tag in XML document using schema.

tprakash15-Jul-09 22:28

tprakash

15-Jul-09 22:28

Finally, I could create the desired xsd to valid the xml.
I truly appreciate your great help.

Thanks a lot. Smile | :)

Prakash

[Message Deleted]

lostinxsl16-Jun-09 4:49

lostinxsl

16-Jun-09 4:49

[Message Deleted]

Re: XSL: which generates Javascript

led mike16-Jun-09 5:36

led mike

16-Jun-09 5:36

lostinxsl wrote:
It would be great it someone could guide me.

There are tutorials all over the Web for beginners. You can use google to find them with like

Javascript tutorial

There are some at www.w3schools.com

[Message Deleted]

lostinxsl16-Jun-09 13:45

lostinxsl

16-Jun-09 13:45

[Message Deleted]

Re: XSL: which generates Javascript

led mike17-Jun-09 4:29

led mike

17-Jun-09 4:29

lostinxsl wrote:
I cant figure out this :

a XSL generates a javascript function.

Ok, that part is done then and has nothing to do with:

lostinxsl wrote:
This javascript functions is used in html .

how can i do this ?

Again, if you don't understand how to use javascript in a browser then you need to be studying more beginner material on that subject until you do understand.

Also:

lostinxsl wrote:
I am only able to display the javascript function on a webpage

Javascript that is correctly added to HTML will not be displayed in the browser. So again, you need to know how to write HTML/Javascript before you try to generate it with anything else like XSLT.

XML Accuracy Puzzle

contactowen16-Jun-09 2:40

contactowen

16-Jun-09 2:40

If I execute the following xslt I get the result given below.
I'm no mathematician but 100 times 2500.01 does not equal 250001.00000000003
I can find very little about this on the web and no suggested fixes or
solutions.
This is causing me a big problem as my entire architecture hangs around xslt.
Using VS2008 and have IE8 installed.
Can anyone help? Please?

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<xsl:template match="/">
<res>
<xsl:value-of select="2500.01 * 100"/>
</res>
</xsl:template>
</xsl:stylesheet>

<?xml version="1.0" encoding="utf-8"?>
<res>250001.00000000003</res>

Re: XML Accuracy Puzzle

Stuart Dootson16-Jun-09 2:54

Stuart Dootson

16-Jun-09 2:54

Not strictly an XSLT problem - it's more that IEEE754 floating-point isn't completely accurate, especially with things like .1 or .01, as they are irrational when expressed in binary.

For example - I just tried your example with both Python[^] and ghci[^] (a Haskell[^] REPL), and they gave the same answer as you got.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: XML Accuracy Puzzle

contactowen16-Jun-09 4:19

contactowen

16-Jun-09 4:19

On another forum (I know naughty) I got this response:

Well XPath 1.0 uses double floating point numbers like JavaScript or
Java do too and with these there is limited precision, in particular
when there is no finite binary representation of a number.

With XSLT 1.0 you can use format-number to ensure you get a certain
number of decimal positions. Or you need to change to XPath 2.0 (as
implemented by Saxon 9) and use xs:decimal numbers instead of double
numbers.

--

Martin Honnen --- MVP XML
http://msmvps.com/blogs/martin_honnen/

Thanks Martin Wink | ;-)

Re: XML Accuracy Puzzle

Stuart Dootson16-Jun-09 5:43

Stuart Dootson

16-Jun-09 5:43

contactowen wrote:
On another forum (I know naughty)

Indeed - consider your CP membership revoked!!! Big Grin | :-D

contactowen wrote:
With XSLT 1.0 you can use format-number to ensure you get a certain number of decimal positions.

Quite true - I wasn't aware of that function until you mentioned it Blush | :O

contactowen wrote:
Or you need to change to XPath 2.0 (as
implemented by Saxon 9) and use xs:decimal numbers instead of double numbers.

Also true (in the commercial version of Saxon, anyway - I don't think the free one supports XML Schema datatypes) - I presumed that you would be using MSXML, in which case XPath 2.0 and XSLT 2.0 aren't really an option.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Image in XML attribute

Nikkiee15-Jun-09 16:59

Nikkiee

15-Jun-09 16:59

can any one please help me out to insert the another image in the form of base64
inside the aatribute
<>

I have a xml format like above and I want to inset the image in place of existing image .
Please help

Re: Image in XML attribute

Stuart Dootson15-Jun-09 22:48

Stuart Dootson

15-Jun-09 22:48

Firstly you need to convert your image to base64 - I'll presume you know how to do this.

To insert the new value, you need to navigate to the relevant element using the XML DOM[^] API. Then (presuming you're using Microsoft's MSXML) you would use the IXMLDOMElement::setAttribute[^] method with a name of "image" and the value set to the base64 encoded image string.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

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