XML problem

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gk - 20 Nov 2006 16:12 GMT

XML
======

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

data before element
<element attr1="value1" attr2="value2">
<data1 a="v">some data & one attribute</data1>
<data2>CDATA follows <![CDATA[more data]]></data2>
</element>
data after element
<?proc data for processing?>
</sample>

Output
========

> java FirstSample first.xml

startDocument
startElement:
characters: data before element
startElement:
attribute: ="value1"
attribute: ="value2"
startElement:
attribute: ="v"
characters: some data
characters: &
characters: one attribute
endElement
startElement:
characters: CDATA follows
characters: more data
endElement
endElement
characters: data after element
processingInstruction: proc
data: data for processing
endElement
endDocument

this is a SAX parser.

what i dont understand here is , in above why the characters are

characters: some data
characters: &
characters: one attribute

WHY NOT characters : some data & one attribute.

why there are 3 lines for it ?

how do i know under which character , he characters will be broken and
will make 3 lines as above ?

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Thomas Fritsch - 20 Nov 2006 17:14 GMT

> XML

[...]

> <data1 a="v">some data & one attribute</data1>

[...]

> Output

[...]

> startElement:
> attribute: ="v"
> characters: some data
> characters: &
> characters: one attribute
> endElement

[...]

> what i dont understand here is , in above why the characters are
>
[quoted text clipped - 5 lines]
>
> why there are 3 lines for it ?

Because it is easier for the parser.

> how do i know under which character , the characters will be broken and
> will make 3 lines as above ?

You can't know. :-(
The parsers are free to do it as they like. That means the parser may do
it in a way that is easiest for *him*, but not easiest for *you*.
The justification is in the API docs of ContentHandler.chars() at
<http://java.sun.com/j2se/1.4.2/docs/api/org/xml/sax/ContentHandler.html#characte
rs(char[],%20int,%20int)>
<QUOTE>
SAX parsers may return all contiguous character data in a single chunk,
or they may split it into several chunks;
</QUOTE>
So you have to cope with possibly multiple chunks of characters (i.e.
reassemble them somehow).

Signature

Thomas

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gk - 21 Nov 2006 04:10 GMT

> > XML
> [...]
[quoted text clipped - 39 lines]
> --
> Thomas

nicely spoken.

but the parser is running some algo ...right ? or it is really randomly
breaking chars !
the parser might be abiding some rules or algo to do this taks ....is
not it ?

may be parser has this algo ...

If parser finds "amp' the break chars
if parser finds ";" the break chars

some sort of like this ....

or it is a whimsical parser !

Reply to this Message

Ian Wilson - 21 Nov 2006 11:27 GMT

>>> XML
>>
[quoted text clipped - 50 lines]
>
> or it is a whimsical parser !

Code as if it is whimsical and capricious and all will be well.

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XML problem

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