How to check external file (logo) existence?

Hello all,
We use BIP 11.1.1.6 (build 5.12.110)
In our rtf template, we use external logo with command :
<fo:external-graphic src="url('{xdoxslt:get_variable($_XDOCTX, 'LOGOFILE')}')"/>That works perfectly.
But, we would like to check existence of the logo file before printing it, and if the logofile doesn't exist then display a default logo.
Is it possible to check file existence in this situation ?
Thanks in advance,
Olivier

Hello AlexAnd,
I tried to put together all what you said, but as soon as I used <image>, the engine sends this error below:
Here is my code :
<?xdoxslt:set_variable($_XDOCTX, 'OU', substring(IdReference/Description, 1, 4))?>
OU:<?xdoxslt:get_variable($_XDOCTX, 'OU')?>
<?xdoxslt:set_variable($_XDOCTX, 'LOGOFILE', concat( 'C:\GFS\images\', xdoxslt:get_variable($_XDOCTX, 'OU'),'.jpg'))?>
LOGOFILE:<?xdoxslt:get_variable($_XDOCTX, 'LOGOFILE')?>
<?xdoxslt:set_variable($_XDOCTX, 'DEFAULTLOGO', concat( 'C:\GFS\images\', 'Default','.jpg'))?>
DEFAULTLOGO:<?xdoxslt:get_variable($_XDOCTX, 'DEFAULTLOGO')?>
<image><fo:external-graphic src="url('{xdoxslt:get_variable($_XDOCTX, 'LOGOFILE')}')"/></image>
<defaultimage><fo:external-graphic src="url('{xdoxslt:get_variable($_XDOCTX, 'DEFAULTLOGO')}')"/></defaultimage>The error comes before the 2 if commands.
Here is the error detail:
[052413_003637400][oracle.xdo.template.FOProcessor][EXCEPTION] oracle.xdo.XDOSAXException: org.xml.sax.SAXException: element image is not supported yet.
     at oracle.xdo.template.fo.FOProcessingEngine.process(FOProcessingEngine.java:421)
     at oracle.xdo.template.FOProcessor.generate(FOProcessor.java:1218)
     at RTF2PDF2.runRTFto(RTF2PDF2.java:473)
     at RTF2PDF2.runXDO(RTF2PDF2.java:337)
     at RTF2PDF2.main(RTF2PDF2.java:230)
Caused by: org.xml.sax.SAXException: element image is not supported yet.
     at oracle.xdo.template.fo.FOHandler.startElement(FOHandler.java:285)
     at oracle.xdo.common.xml.XSLTHandler$SEEntry.sendEvent(XSLTHandler.java:542)
     at oracle.xdo.common.xml.XSLTMerger.startElement(XSLTMerger.java:51)
     at oracle.xdo11g.parser.v2.XMLContentHandler.startElement(XMLContentHandler.java:182)
     at oracle.xdo11g.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1322)
     at oracle.xdo11g.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:366)
     at oracle.xdo11g.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:312)
     at oracle.xdo11g.parser.v2.XMLParser.parse(XMLParser.java:218)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at oracle.xdo.common.xml.XDOSAXParser.invokeParse(XDOSAXParser.java:166)
     at oracle.xdo.common.xml.XDOSAXParser.parse(XDOSAXParser.java:122)
     at oracle.xdo.template.fo.FOProcessingEngine.process(FOProcessingEngine.java:407)
     ... 4 more
[052413_003637402][oracle.xdo.template.FOProcessor][ERROR] End Memory: max=227MB, total=98MB, free=47MBI may not clearly translate what you suggested, I think about the setting of <image> and <defaultimage> with command fo:external-graphic, but this came as an immediate thought.
Any suggestion ?
Can you help ?
Thanks,
Olivier

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