Create documentation.md

src/xslt/documentation.md

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+We propose in this document to expose how to use the XLST can be used to process the XML file generated with src/zbmath_rest2oai/getAsXml.py.
+
+Environment request:
+
+_ JDK version 8
+
+_ Maven 3
+
+Install the package :
+
+https://github.com/physikerwelt/xstlprocJ
+
+Point the folder xstlprocJ, copy the files xslt-article-transformation.xslt and plain.xml then execute the shell command:
+
+```shell
+:~/xstlprocJ$ bash xsltprocJ xslt-article-transformation.xslt plain.xml
+Warning: at xsl:stylesheet on line 2 column 255 of xslt-article-transformation.xslt:
+  Running an XSLT 1 stylesheet with an XSLT 2 processor
+
+```
+
+This command outputs the following XML document
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?><oai_zb_preview xmlns:oai_zb_preview="https://zbmath.org/OAI/2.0/oai_zb_preview/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:zbmath="https://zbmath.org/zbmath/elements/1.0/"><author>Maynard, James</author><author_ids><author_id>maynard.james</author_id></author_ids><classifications><classification>11N05</classification><classification>11N36</classification></classifications></oai_zb_preview>maz@BE000078:~/xstlprocJ$
+```