[xep-support] XEP 3.6: error in the resolution of relative URLs in the resource scheme

[Nikolai Grigoriev]

Werner,

after analyzing the issue a bit, I realized that there is no chance
to get relative URLs in entities work properly when the document
system ID is expressed as 'resource:' URL. The best thing we
can do is to enable _absolute_ 'resource:' URLs in external
entities, so that you could write

   <!ENTITY local SYSTEM "resource:/fonts.local.ent">
   <!ENTITY mt SYSTEM "resource:/monotype.ent">

and still have your entities stored separately in the Jar file.

XEP 3.6.1 is just released with these changes incorporated.

Best regards,
Nikolai Grigoriev
RenderX


----- Original Message ----- 
From: "Werner Donné" <werner.donne at re.be>
To: "XEP Support" <xep-support at renderx.com>
Sent: Wednesday, September 17, 2003 12:42 AM
Subject: [xep-support] XEP 3.6: error in the resolution of relative URLs in the resource scheme


Hi,

Thank you for implementing the URL feature.

There is, however, an error when relative URLs must be resolved. I have put my
XEP configuration in a jar and added the latter to the classpath. The
com.renderx.xep.ROOT property is set to "resource:/", which corresponds to the
way the jar was made. In the etc/fonts.xml file in it I have the following:

<?xml version="1.0"?>
<!DOCTYPE fonts
[
   <!ENTITY local SYSTEM "fonts.local.ent">
   <!ENTITY mt SYSTEM "monotype.ent">
]>

..

<fonts>
    &local;

..
</fonts>

The local entity reference can't be resolved. The following stack trace is produced:

java.lang.RuntimeException: cannot parse resource:/etc/fonts.xml:
java.net.MalformedURLException: no protocol: fonts.local.ent
         at com.renderx.fonts.Finder.init(Unknown Source)
         at com.renderx.fonts.Finder.init(Unknown Source)
         at com.renderx.xep.Driver.init(Unknown Source)
         at com.renderx.xep.Driver.init(Unknown Source)
         at be.re.tools.XEP.main(XEP.java:294)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
         at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:324)
         at be.re.tools.NetWrapper.main(NetWrapper.java:20)

It seems to consider the system id of the "local" entity as an absolute URL. The base
URL for resolving "fonts.local.ent" is "resource:/etc/fonts.xml". Hence, the resolution
should yield "resource:/etc/font.local.ent". This seems to be an EntityResolver issue.

If the entity reference is removed it works, but then I don't have my local fonts entity
of course. The good news is anyway that there is a work-around, since one can always
inline the entity.

Regards,

Werner.
-- 
Werner Donné  --  Re BVBA
Engelbeekstraat 8
B-3300 Tienen
tel: (+32) 486 425803 e-mail: werner.donne at re.be

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