Home » Modeling » EMF » Reading CDATA content into an EMF model
| Reading CDATA content into an EMF model [message #425897] |
Thu, 11 December 2008 11:26  |
 Robert Wloch
Messages: 109
Registered: July 2009 |
Senior Member |
|
|
Hello EMF community,
we're using EMF to read XML files (provided by some other black box
software) into a model. The XML files look something like this one:
<?xml version="1.0" encoding="UTF-8"?>
<rn:structure xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
xmlns:rn="http://www.foo.bar/rn">
<node name="Foo">
<documentation><![CDATA[Some text with lots of special
chars.]]></documentation>
</node>
</rn:structure>
Now, I'm having some trouble getting the CDATA value into the model's
documentation feature. The relevant Ecore model part is as follows:
<eClassifiers xsi:type="ecore:EClass" name="Node">
<eStructuralFeatures xsi:type="ecore:EAttribute" name="documentation"
upperBound="-1"
eType="ecore:EDataType
http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eClassifiers>
With the above, I think EMF doesn't behave correctly or I did something
wrong in the Ecore-file. When opening the above XML model with my
generated Editor, EMF reads in the value of the CDATA as desired. In the
properties view I see "Some text with lots of special chars." as value of
the documentation feature.
Strange behavior #1:
When a alter the read in model using the EMF generated editor and save it,
the <![CDATA[]]> disappeared in the XML file.
Strange behavior #2:
Using an XML or text editor I remove the <documentation>-tags and then
reopen the XML file using my EMF model editor. There I set the
documentation feature's value to "<![CDATA[Some <really> fönny and wíred
text with lots of special chars.]]>" and save the file. Now, the '<' get
transformed to "%lt;", however, not so the '>' symbols. Additionally, the
special characters are transformed to some UTF-8 encoding. What's
definitely no good, is that the just saved file cannot be opened with the
EMF editor anymore.
Can anybody give me a hint on how to read in the CDATA stuff into my
model's documentation feature without loosing the "<![CDATA[" and "]]>"
characters?
Any help is appreciated.
I'm using Eclipse Version: 3.4.1 with EMF Ecore 2.4.1.
Thx for reading,
Rob
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| Re: Reading CDATA content into an EMF model [message #425930 is a reply to message #425905] |
Fri, 12 December 2008 09:33  |
Robert Wloch
Messages: 109
Registered: July 2009 |
Senior Member |
|
|
Ed,
Yes, long time no see. But I've been following your "Ed-around-the-world"
tour on your blog. ;-)
Answers and questions below.
Ed Merks wrote:
> Robert,
> Long time no see...
> Comments below.
> Robert Wloch wrote:
>> Hello EMF community,
>>
>> we're using EMF to read XML files (provided by some other black box
>> software) into a model. The XML files look something like this one:
>> <?xml version="1.0" encoding="UTF-8"?>
>> <rn:structure xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
>> xmlns:rn="http://www.foo.bar/rn">
>> <node name="Foo">
>> <documentation><![CDATA[Some text with lots of special
>> chars.]]></documentation>
>> </node>
>> </rn:structure>
>>
>> Now, I'm having some trouble getting the CDATA value into the model's
>> documentation feature. The relevant Ecore model part is as follows:
>> <eClassifiers xsi:type="ecore:EClass" name="Node">
>> <eStructuralFeatures xsi:type="ecore:EAttribute"
>> name="documentation" upperBound="-1"
>> eType="ecore:EDataType
>> http://www.eclipse.org/emf/2002/Ecore#//EString"/>
>> </eClassifiers>
>>
>>
>> With the above, I think EMF doesn't behave correctly or I did
>> something wrong in the Ecore-file. When opening the above XML model
>> with my generated Editor, EMF reads in the value of the CDATA as
>> desired. In the properties view I see "Some text with lots of special
>> chars." as value of the documentation feature.
>>
>> Strange behavior #1:
>> When a alter the read in model using the EMF generated editor and save
>> it, the <![CDATA[]]> disappeared in the XML file.
> Yes, the final EMF model has no idea whether the data was specified
> using CDATA or entities.
>>
>> Strange behavior #2:
>> Using an XML or text editor I remove the <documentation>-tags and then
>> reopen the XML file using my EMF model editor. There I set the
>> documentation feature's value to "<![CDATA[Some <really> fönny and
>> wíred text with lots of special chars.]]>" and save the file. Now, the
>> '<' get transformed to "%lt;", however, not so the '>' symbols.
> Yes, it's not actually necessary to escape the closing '>' in an
> attribute value.
Confirmed.
> Doesn't EMF write out a value as an attribute by default.
Is this actually a question? If so: In my case I did the trick by
specifying upper bound = -1 resulting the attribute being written out as a
child tag instead of an attribute of the parent tag.
>> Additionally, the special characters are transformed to some UTF-8
>> encoding. What's definitely no good, is that the just saved file
>> cannot be opened with the EMF editor anymore.
> There are some characters that simply aren't allowed in XML at all.
> Like the zero byte ASCII character.
Okay, I'll provide this to the black box developers just to make sure.
>>
>> Can anybody give me a hint on how to read in the CDATA stuff into my
>> model's documentation feature without loosing the "<![CDATA[" and
>> "]]>" characters?
> This option might produce what you want:
> /**
> * Serialized element content that needs escaping and doesn't
> contain <code>"]]>"</code>, will be escaped using CDATA.
> * The default value is false.
> * @since {@link #OPTION_SKIP_ESCAPE}
> * @since 2.4
> */
> String OPTION_ESCAPE_USING_CDATA = "ESCAPE_USING_CDATA";
I've read about this option somewhere else yesterday. However, I didn't
find the right place to set it. Can I do this in the genmodel, or do I
need to modify a generated class or else?
> Is the actual model derived from a schema and you're using the generated
> resource for load and save?
I designed an ecore file via reverse engineering since there's no schema
available for the model. But we do use the generated resource for load in
combination with oaW to generate an Xtext editor.
Since I'm able to read in the CDATA stuff everything's okay for now. I was
just evaluating how to save the resource as that's a very likely
requirement that may come up by our customer in the near future.
>>
>> Any help is appreciated.
>>
>> I'm using Eclipse Version: 3.4.1 with EMF Ecore 2.4.1.
>>
>> Thx for reading,
>> Rob
>>
>>
>>
|
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| Re: Reading CDATA content into an EMF model [message #425942 is a reply to message #425930] |
Fri, 12 December 2008 21:49 |
Ed Merks
Messages: 33136
Registered: July 2009 |
Senior Member |
|
|
Robert,
Comments below.
Robert Wloch wrote:
> Ed,
>
> Yes, long time no see. But I've been following your
> "Ed-around-the-world" tour on your blog. ;-)
>
> Answers and questions below.
>
>
> Ed Merks wrote:
>
>> Robert,
>
>> Long time no see...
>
>> Comments below.
>
>
>> Robert Wloch wrote:
>>> Hello EMF community,
>>>
>>> we're using EMF to read XML files (provided by some other black box
>>> software) into a model. The XML files look something like this one:
>>> <?xml version="1.0" encoding="UTF-8"?>
>>> <rn:structure xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
>>> xmlns:rn="http://www.foo.bar/rn">
>>> <node name="Foo">
>>> <documentation><![CDATA[Some text with lots of special
>>> chars.]]></documentation>
>>> </node>
>>> </rn:structure>
>>>
>>> Now, I'm having some trouble getting the CDATA value into the
>>> model's documentation feature. The relevant Ecore model part is as
>>> follows:
>>> <eClassifiers xsi:type="ecore:EClass" name="Node">
>>> <eStructuralFeatures xsi:type="ecore:EAttribute"
>>> name="documentation" upperBound="-1"
>>> eType="ecore:EDataType
>>> http://www.eclipse.org/emf/2002/Ecore#//EString"/>
>>> </eClassifiers>
>>>
>>>
>>> With the above, I think EMF doesn't behave correctly or I did
>>> something wrong in the Ecore-file. When opening the above XML model
>>> with my generated Editor, EMF reads in the value of the CDATA as
>>> desired. In the properties view I see "Some text with lots of
>>> special chars." as value of the documentation feature.
>>>
>>> Strange behavior #1:
>>> When a alter the read in model using the EMF generated editor and
>>> save it, the <![CDATA[]]> disappeared in the XML file.
>> Yes, the final EMF model has no idea whether the data was specified
>> using CDATA or entities.
>>>
>>> Strange behavior #2:
>>> Using an XML or text editor I remove the <documentation>-tags and
>>> then reopen the XML file using my EMF model editor. There I set the
>>> documentation feature's value to "<![CDATA[Some <really> fönny and
>>> wíred text with lots of special chars.]]>" and save the file. Now,
>>> the '<' get transformed to "%lt;", however, not so the '>' symbols.
>> Yes, it's not actually necessary to escape the closing '>' in an
>> attribute value.
> Confirmed.
>
>> Doesn't EMF write out a value as an attribute by default.
> Is this actually a question? If so: In my case I did the trick by
> specifying upper bound = -1 resulting the attribute being written out
> as a child tag instead of an attribute of the parent tag.
Yes, multi-valued features will by default be elements...
>
>>> Additionally, the special characters are transformed to some UTF-8
>>> encoding. What's definitely no good, is that the just saved file
>>> cannot be opened with the EMF editor anymore.
>> There are some characters that simply aren't allowed in XML at all.
>> Like the zero byte ASCII character.
> Okay, I'll provide this to the black box developers just to make sure.
>
>>>
>>> Can anybody give me a hint on how to read in the CDATA stuff into my
>>> model's documentation feature without loosing the "<![CDATA[" and
>>> "]]>" characters?
>> This option might produce what you want:
>
>> /**
>> * Serialized element content that needs escaping and doesn't
>> contain <code>"]]>"</code>, will be escaped using CDATA.
>> * The default value is false.
>> * @since {@link #OPTION_SKIP_ESCAPE}
>> * @since 2.4
>> */
>> String OPTION_ESCAPE_USING_CDATA = "ESCAPE_USING_CDATA";
> I've read about this option somewhere else yesterday. However, I
> didn't find the right place to set it. Can I do this in the genmodel,
> or do I need to modify a generated class or else?
You'd generally modify the generated XyzResourceFactoryImpl. If you
don't have one, you'd change the GenPackage's Resource Type, delegate
the plugin.xml so it's regenerated, and regenerate so you do have one.
>
>> Is the actual model derived from a schema and you're using the
>> generated resource for load and save?
> I designed an ecore file via reverse engineering since there's no
> schema available for the model. But we do use the generated resource
> for load in combination with oaW to generate an Xtext editor.
> Since I'm able to read in the CDATA stuff everything's okay for now. I
> was just evaluating how to save the resource as that's a very likely
> requirement that may come up by our customer in the near future.
No application should ever care whether CDATA or entities. Users might
be bothered, but applications shouldn't care...
>
>>>
>>> Any help is appreciated.
>>>
>>> I'm using Eclipse Version: 3.4.1 with EMF Ecore 2.4.1.
>>>
>>> Thx for reading,
>>> Rob
>>>
>>>
>>>
>
>
Ed Merks
Professional Support: https://www.macromodeling.com/
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| Re: Reading CDATA content into an EMF model [message #427624 is a reply to message #425905] |
Tue, 24 February 2009 17:14 |
koloale
Messages: 41
Registered: July 2009 |
Member |
|
|
Hello,
Ed Merks wrote:
> Robert,
>
> Long time no see...
>
> Comments below.
>
>
> Robert Wloch wrote:
>> Hello EMF community,
>>
>> we're using EMF to read XML files (provided by some other black box
>> software) into a model. The XML files look something like this one:
>> <?xml version="1.0" encoding="UTF-8"?>
>> <rn:structure xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
>> xmlns:rn="http://www.foo.bar/rn">
>> <node name="Foo">
>> <documentation><![CDATA[Some text with lots of special
>> chars.]]></documentation>
>> </node>
>> </rn:structure>
>>
>> Now, I'm having some trouble getting the CDATA value into the model's
>> documentation feature. The relevant Ecore model part is as follows:
>> <eClassifiers xsi:type="ecore:EClass" name="Node">
>> <eStructuralFeatures xsi:type="ecore:EAttribute"
>> name="documentation" upperBound="-1"
>> eType="ecore:EDataType
>> http://www.eclipse.org/emf/2002/Ecore#//EString"/>
>> </eClassifiers>
>>
>>
>> With the above, I think EMF doesn't behave correctly or I did
>> something wrong in the Ecore-file. When opening the above XML model
>> with my generated Editor, EMF reads in the value of the CDATA as
>> desired. In the properties view I see "Some text with lots of special
>> chars." as value of the documentation feature.
>>
>> Strange behavior #1:
>> When a alter the read in model using the EMF generated editor and save
>> it, the <![CDATA[]]> disappeared in the XML file.
> Yes, the final EMF model has no idea whether the data was specified
> using CDATA or entities.
I have the same problem: I add CDATA to the FeatureMap, save xml, then
load it and result FeatureMap loose information about CDATA. I don't
completely understand why it is correct, and why EMF couldn't determine
that data is specified using CDATA, because text and CDATA is a
different node types. And strictly speaking saved and loaded documents
are not equal (at least in terms of XMLUnit).
Thanks in advance,
Alexey
|
|
|
| Re: Reading CDATA content into an EMF model [message #427625 is a reply to message #427624] |
Tue, 24 February 2009 17:40 |
Ed Merks
Messages: 33136
Registered: July 2009 |
Senior Member |
|
|
This is a multi-part message in MIME format.
--------------090208050105040804030501
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: 7bit
Do you have this XMLResource option mapped true in the resource factory
used to create your resource?
/**
* Determines whether comments and CDATA will be preserved in any
mixed text processing.
* This option is applicable for loading XML resources (from DOM
node or an InputStream)
*/
String OPTION_USE_LEXICAL_HANDLER = "USE_LEXICAL_HANDLER";
koloale wrote:
> Hello,
>
> Ed Merks wrote:
>> Robert,
>>
>> Long time no see...
>>
>> Comments below.
>>
>>
>> Robert Wloch wrote:
>>> Hello EMF community,
>>>
>>> we're using EMF to read XML files (provided by some other black box
>>> software) into a model. The XML files look something like this one:
>>> <?xml version="1.0" encoding="UTF-8"?>
>>> <rn:structure xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
>>> xmlns:rn="http://www.foo.bar/rn">
>>> <node name="Foo">
>>> <documentation><![CDATA[Some text with lots of special
>>> chars.]]></documentation>
>>> </node>
>>> </rn:structure>
>>>
>>> Now, I'm having some trouble getting the CDATA value into the
>>> model's documentation feature. The relevant Ecore model part is as
>>> follows:
>>> <eClassifiers xsi:type="ecore:EClass" name="Node">
>>> <eStructuralFeatures xsi:type="ecore:EAttribute"
>>> name="documentation" upperBound="-1"
>>> eType="ecore:EDataType
>>> http://www.eclipse.org/emf/2002/Ecore#//EString"/>
>>> </eClassifiers>
>>>
>>>
>>> With the above, I think EMF doesn't behave correctly or I did
>>> something wrong in the Ecore-file. When opening the above XML model
>>> with my generated Editor, EMF reads in the value of the CDATA as
>>> desired. In the properties view I see "Some text with lots of
>>> special chars." as value of the documentation feature.
>>>
>>> Strange behavior #1:
>>> When a alter the read in model using the EMF generated editor and
>>> save it, the <![CDATA[]]> disappeared in the XML file.
>> Yes, the final EMF model has no idea whether the data was specified
>> using CDATA or entities.
>
> I have the same problem: I add CDATA to the FeatureMap, save xml, then
> load it and result FeatureMap loose information about CDATA. I don't
> completely understand why it is correct, and why EMF couldn't
> determine that data is specified using CDATA, because text and CDATA
> is a different node types. And strictly speaking saved and loaded
> documents are not equal (at least in terms of XMLUnit).
>
> Thanks in advance,
> Alexey
--------------090208050105040804030501
Content-Type: text/html; charset=ISO-8859-15
Content-Transfer-Encoding: 8bit
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-15"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Do you have this XMLResource option mapped true in the resource factory
used to create your resource?<br>
<blockquote>
Ed Merks
Professional Support: https://www.macromodeling.com/
|
|
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| Re: Reading CDATA content into an EMF model [message #427637 is a reply to message #427625] |
Wed, 25 February 2009 07:20 |
koloale
Messages: 41
Registered: July 2009 |
Member |
|
|
Oh, I'm sorry I didn't have this option set true. Thank you Ed.
Ed Merks wrote:
> Do you have this XMLResource option mapped true in the resource factory
> used to create your resource?
>
> /**
> * Determines whether comments and CDATA will be preserved in any
> mixed text processing.
> * This option is applicable for loading XML resources (from DOM
> node or an InputStream)
> */
> String OPTION_USE_LEXICAL_HANDLER = "USE_LEXICAL_HANDLER";
>
>
> koloale wrote:
>> Hello,
>>
>> Ed Merks wrote:
>>> Robert,
>>>
>>> Long time no see...
>>>
>>> Comments below.
>>>
>>>
>>> Robert Wloch wrote:
>>>> Hello EMF community,
>>>>
>>>> we're using EMF to read XML files (provided by some other black box
>>>> software) into a model. The XML files look something like this one:
>>>> <?xml version="1.0" encoding="UTF-8"?>
>>>> <rn:structure xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
>>>> xmlns:rn="http://www.foo.bar/rn">
>>>> <node name="Foo">
>>>> <documentation><![CDATA[Some text with lots of special
>>>> chars.]]></documentation>
>>>> </node>
>>>> </rn:structure>
>>>>
>>>> Now, I'm having some trouble getting the CDATA value into the
>>>> model's documentation feature. The relevant Ecore model part is as
>>>> follows:
>>>> <eClassifiers xsi:type="ecore:EClass" name="Node">
>>>> <eStructuralFeatures xsi:type="ecore:EAttribute"
>>>> name="documentation" upperBound="-1"
>>>> eType="ecore:EDataType
>>>> http://www.eclipse.org/emf/2002/Ecore#//EString"/>
>>>> </eClassifiers>
>>>>
>>>>
>>>> With the above, I think EMF doesn't behave correctly or I did
>>>> something wrong in the Ecore-file. When opening the above XML model
>>>> with my generated Editor, EMF reads in the value of the CDATA as
>>>> desired. In the properties view I see "Some text with lots of
>>>> special chars." as value of the documentation feature.
>>>>
>>>> Strange behavior #1:
>>>> When a alter the read in model using the EMF generated editor and
>>>> save it, the <![CDATA[]]> disappeared in the XML file.
>>> Yes, the final EMF model has no idea whether the data was specified
>>> using CDATA or entities.
>>
>> I have the same problem: I add CDATA to the FeatureMap, save xml, then
>> load it and result FeatureMap loose information about CDATA. I don't
>> completely understand why it is correct, and why EMF couldn't
>> determine that data is specified using CDATA, because text and CDATA
>> is a different node types. And strictly speaking saved and loaded
>> documents are not equal (at least in terms of XMLUnit).
>>
>> Thanks in advance,
>> Alexey
|
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