[xep-support] Re: How often does XEP.BAT use my graphic-URL?

[Vladyslav Sivyakov]

Hello Fritz,

Throughout the formatting process, XEP retrieves various information 
about the external resources, like dimensions.

Caching the entire content is problematic because in large documents, 
the total size of external resources would make the Java environment on 
a formatting machine quickly run out of memory.

There is a standard solution for that -- XML Catalogs. You make a local 
copy of frequently-used resources and configure a Catalog Resolver do 
the job. Simple ones simply return local files (file:) instead of those 
located on remote (http:) computers, but nothing prevents from 
implementing your own sophisticated one that has some timed-cache 
strategy and periodically refreshed entities.

A typical usage is when you're developing DocBook documents, and each 
rendering process takes an http hit to docbook.sourceforge.net. Of 
course, this makes rendering slow, and you may want to improve it. 
Here's more details:

http://www.renderx.com/reference.html#URI_Resolution

http://www.renderx.com/reference.html#using_catalogs_for_docbook

https://www.oasis-open.org/committees/entity/spec-2001-08-06.html

Alternatively, a caching proxy could be a solution, but it may be an 
overhead and depend on your needs.


Best regards,
Vladyslav Y. Sivyakov, RenderX.

On 31.07.2020 09:44, Kirch Fritz wrote:
>
> Hi RenderX-Support Team, hi Kevin
>
> in my FO-file (see below and in appendix) you can find excatly one 
> call of <fo:external-graphic> with a url to my graphic file.
>
> When I use XEP.BAT to render FO into XEPOUT intermediate format, my 
> server protocoll told me, that there are 3 calls fetching the 
> pdf-graphic from my server.
>
> I am wondering, why there are 3 calls?
>
> With the processing instruction xep-out-embed-images:
>
>     FO -> XEP calls my media server  3 times    and    XEP -> PDF 
> calls my media server 0 times
>
> Without the processing instruction xep-out-embed-images:
>
>     FO -> XEP calls my media server  2 times    and    XEP -> PDF 
> calls my media server 4 times
>
> How can I minimize the number of calls to my media server?
>
> Fritz Kirch
>
> IT2media GmbH & Co KG
>
> Nuremberg, Germany
>
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