World: r3wp

If there's a function in the object, it drops it.

posted last year to this group!  http://www.rebol.org/aga-display-posts.r?post=r3wp323x568

Thanks Graham. With the way that the programs I am using create the 
objects, I'm finding that I have to create something pretty specific. 
I appreciate the thought and code though.

Is John's the only rebol utility that turns a rebol representation 
back into an xml document with attributes?

check your PMs... (it might not hav turned red.... altme bug)

A question for XML users related to namespaces.


is it possible for a tag's attributes to originate from two different 
namespaces?

ex:
<tag  ns1:attr="data" ns2:other-attr="data">

or even worse:
<tag  ns1:attr="data" ns2:attr="data">


my gut tells me no, but I've been wrong before in this delightfull 
world of XML spec overcomplexification .

FYI, I've just discovered that yes... you can have the same attribute 
several times in a tag so long as the namespace is different.

XML is ... so ... much ... fun....


NOT!

I don't like XML, but it makes sense that namespaces prevent collisions.

yes, its just pretty complicated to manage two attributes of a tag 
which come from different namespaces... so in the end, what does 
the attribute really mean.

Well, if the words has bindings...oh wait, wrong language. ;-)

hehe, yes it is similar to advanced word usage in REBOL.  but xml 
isn't really a language in my understanding (interpretation) of the 
word.

just a dialect with a bad messy syntax...

I just created this function to convert the data tree returned from 
REBOL's default parse-xml function back to the same string:
context [
	out: copy ""
	emitxml: func[dom][
		foreach node dom [
			either string? node [
				out: insert out node
			][
				foreach [ name atts content ] node [
					out: insert out join {<} [name #" "]
					if atts [
						foreach [att val] atts [ 
							out: insert out ajoin [att {="} any [val ""] {" }]
						]
					]
					out: remove back out
					
					either all [content not empty? content] [
						out: insert out #">"
						emitxml content
						out: insert out ajoin ["</" name #">"]
					][
						out: insert out "/>"
					]
				]
			]
		]
	]
	set 'xmltree-to-str func[dom][
		clear head out
		emitxml dom
		head out
	]
]

>> xmltree-to-str third parse-xml {<test arg="1"><bla/>hello</test>}
== {<test arg="1"><bla/>hello</test>}

I'm not sure if the naming is correct, but I don't care, I need the 
functionality.

Does it handle name spaces?

do you mean this?:

>> print xmltree-to-str third parse-xml {<h:table xmlns:h="http://www.w3.org/TR/html4/">
{      <h:tr>
{        <h:td>Apples</h:td>
{        <h:td>Bananas</h:td>
{      </h:tr>
{    </h:table>}
<h:table xmlns:h="http://www.w3.org/TR/html4/">
  <h:tr>
    <h:td>Apples</h:td>
    <h:td>Bananas</h:td>
  </h:tr>
</h:table>

But REBOL's default parse-xml has limitations, so better use Gavin's 
http://www.rebol.org/view-script.r?script=xml-parse.rif you must 
parse some advanced XML doc's.

Also it's probably possible to use parse instead of the recursive 
function call, but it's working for me so I will stay with this one.

Just note, that if the source xml is using CDATA, the parsed tree 
does not contain this info, so the result would be different.

>> print xmltree-to-str probe third parse-xml+ {<foo>abc <![CDATA[Jack 
& Jill]]> xyz</foo> }
[["foo" none ["abc Jack & Jill xyz"]]]
<foo>abc Jack & Jill xyz</foo>

I'm not sure how to awoid this, but fortunately my XML sources must 
be well formed without CDATA so I'm safe.

Graham, AltXML dom objects have a 'flatten function that renders 
xml.  It preserves namespaces but not whitespace or cdata as cdata 
(though I may do a strict version that does both).

Finally, the work of the W3C binary XML group is an official recommendation: 
http://www.w3.org/TR/exi/

just an interesing fact: the Relax NG Compact schema description 
language is a Rebol dialect if i remove the commas from it.

i tried it on the OAGiS Components.xsd which i transformed to RNG 
and the to RNC using XMLKit

anyone here had issues with receiving Form feed characters in XML 
(which are illegal in XML 1.0) ?