[xep-support] Re: SVG DTD download errors

Great stuff, Vladyslav and Ken. Thanks for the info. XML Catalogs have
become kind of an arcane knowledge, and I have recorded all this for
future inquires.

Mark

On 10/24/2023 4:22 AM, Vladyslav Sivyakov wrote:
>
> Hello Gerd,
>
> XML Catalogs seems to be a good tool for this task.
>
> In a simplest case, it can be used to rewrite network URI (http to
> https). But there's more; you can download the DTD in question (and
> any other resource) locally so that XEP used it instead of doing so
> via a slow and unreliable network connection. It also has a fallback
> logic so that if no local resource found, it would go online for
> retrieving it.
>
> What you need is:
>
> 1. Download xml-commons-resolver-1.2.zip from the Apache Web site:
> https://dlcdn.apache.org//xerces/xml-commons/
> 2. Extract |resolver.jar | into a directory listed in CLASSPATH;
> 3. Download svg11.dtd (and any other resources you need) locally;
> 4. Write a |.cat |file to configure XML Catalog to point to your
> locally-stored resources;
> 5. Invoke XEP with two additional parameters. Here's how to do it in
> command-line:|
> java
> -Dcom.renderx.sax.entityresolver=org.apache.xml.resolver.tools.CatalogResolver
> -Dcom.renderx.jaxp.uriresolver=org.apache.xml.resolver.tools.CatalogResolver
> com.renderx.xep.XSLDriver
> ...
> |||
>
> A good reading would be this article:
> http://www.sagehill.net/docbookxsl/Catalogs.html
>
> For further details, refer "XML Entity and URI Resolvers" by Norman
> Walsh:
> https://xerces.apache.org/xml-commons/components/resolver/resolver-article.html
>
> XEP User Guide also has a section describing how one could use XML
> Catalog for a similar purpose, caching DocBook stylesheets:
> https://www.renderx.com/reference.html#using_catalogs_for_docbook
>
> Best regards,
> Vladyslav Sivyakov, RenderX.
> On 24.10.2023 11:09, Gerd v. Egidy wrote:
>> Hi,
>>
>> I include some svg files into my fo file like this:
>>
>> <fo:external-graphic width="auto" height="auto" content-width="36pt"
>> src="url(images/admon/caution.svg)" />
>>
>> This svg file contains a doctype with a external URL to the DTD:
>>
>> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN""http://www.w3.org/Graphics/ SVG/1.1/DTD/svg11.dtd">
>>
>> This results in XEP downloading this DTD file every time such a SVG is
>> included.
>>
>> Recently W3C implemented two changes on their server: they automatically
>> redirect to HTTPS and they have implemented a limit how often you can download
>> a file in short succession. When they still used HTTP my local proxy server was
>> able to serve the dtd from cache after the first download.
>>
>> My fo contains hundreds of such SVG files, causing hundred of downloads to this
>> file. After the first few I get this:
>>
>> [error] Failed to create imagefile:./images/admon/caution.svg of type
>> null
>> [error] com.renderx.graphics.ImageFormatException:
>> org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 100; Cannot read
>> fromhttp://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd (Server returned HTTP
>> response code: 429 for URL:http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd)
>>
>> Is there a way to tell XEP not to download the DTDs or can I redirect them, so
>> that they are loaded from some local cache directory on my disk?
>>
>> Thanks.
>>
>> Kind regards,
>>
>> Gerd
>>
>>
>>
>>
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Received on Tue Oct 24 16:53:39 2023