Re: [igraph] Writing grapheme with weird characters

[Víctor Pascual Cid]

Thanks for the reply.
That's weird, as the validator you're using is not validating my graphml 
(generated with iGraph for R) nor the graphml you provided in your email.

The output file can be found here: http://dl.dropbox.com/u/2048110/output.xml

Any other hint will be much appreciated.

Víctor

On Oct 17, 2011, at 16:34 , Tamas Nepusz wrote:

> Hi Victor,
> 
> Technically, the CDATA tag is not required -- if the attribute values
> contain characters like "<", ">", "&", "'" or the quotation mark itself,
> igraph will escape them using a standard &-based escape sequence. All other
> characters should be encoded in UTF-8 and igraph will print them as usual.
> E.g., in Python:
> 
>>>> g= Graph()
>>>> g["name"] = u"\u1234 < > & '"
>>>> g.write_graphml("test.graphml")
> 
> yields the following GraphML file:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <graphml xmlns="http://graphml.graphdrawing.org/xmlns";
>         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>         xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
>         http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd";>
> <!-- Created by igraph -->
>  <key id="name" for="graph" attr.name="name" attr.type="string"/>
>  <graph id="G" edgedefault="undirected">
>    <data key="name">ሴ &lt; &gt; &amp; &apos;</data>
>  </graph>
> </graphml>
> 
> where the first character of the attribute value is the Unicode character
> with code 1234 (in hexadecimal). According to an XML validator at
> http://www.validome.org/xml/validate/, the generated file is perfectly valid
> XML.
> 
> Footnote: there is a catch when you load the GraphML file back into igraph
> in Python. Since Python has a separate data type for Unicode strings and
> "normal" strings, the "name" will be a standard string containing the
> original string in UTF-8 encoded form, and you must convert it back to
> Unicode manually as follows:
> 
>>>> g["name"] = g["name"].decode("utf-8")
>>>> g["name"]
> u"\u1234 < > & '"
> 
> Cheers,
> Tamas
> 
> 
> On 10/17/2011 03:59 PM, Víctor Pascual Cid wrote:
>> Hi all,
>> 
>> I need to generate a GraphML which nodes contain some weird characters. The 
>> way to deal with strange characters in XML is to use the tag CDATA. However, 
>> I haven't seen this possibility with write.graph(g, format="graphml").
>> Any hint or workaround to solve this problem?
>> 
>> Cheers,
>> 
>> Víctor
>> 
>> 
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> 
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