Wsrtjtyk

given the following xml (which of course consists of many records),

i would like to output unique values out of it, and also generate a report, that would have the records each word was found.

    <collection>

<record>

  <controlfield tag="001">1</controlfield>

  <datafield tag="200" ind1="1" ind2=" ">

    <subfield code="a">Metafore po</subfield>

    <subfield code="e">Δοκίμια</subfield>

    <subfield code="f">Περικλής αρχαία Ελλάδα</subfield>

  </datafield>

  <datafield tag="210" ind1="|" ind2="|">

    <subfield code="a">Η Αθήνα</subfield>

    <subfield code="c">Νοέμβριος</subfield>

    <subfield code="d">1999</subfield>

  </datafield>

  <datafield tag="215" ind1=" " ind2=" ">

    <subfield code="a">263 s.</subfield>

  </datafield>

  <datafield tag="606" ind1="|" ind2=" ">

    <subfield code="3">250000087120140311174609</subfield>

    <subfield code="a">Πλάτων ιστορία</subfield>

  </datafield>

  <datafield tag="700" ind1=" " ind2="1">

    <subfield code="3">200000000120140228092156</subfield>

    <subfield code="4">070</subfield>

    <subfield code="a">Liper</subfield>

    <subfield code="b">Berit von der</subfield>

  </datafield>

</record>

<record>

  <controlfield tag="001">here text may also exist</controlfield>

  <datafield tag="200" ind1="1" ind2=" ">

    <subfield code="a">Metafore po</subfield>

    <subfield code="e">Δοκίμια</subfield>

    <subfield code="f">Περικλής</subfield>

  </datafield>

</collection>

desired output (xml format, or whatever is more easily achieved)

Δοκίμια: 1, here text may also exist

Περικλής: 1, here text may also exist

αρχαία: 1

Η: 1

etc...
regex i have tried with:
/[Α-Ωα-ω]{1,}/

It seems you can treat that like a grouping problem:

  <xsl:template match="collection">

      <xsl:where-populated>

          <ul>

              <xsl:for-each-group select="record" group-by="datafield/subfield!tokenize(., 's')[matches(., 'p{IsGreek}')]">

                  <li>

                      {current-grouping-key()} : <xsl:value-of select="current-group()/controlfield" separator=", "/>

                  </li>



              </xsl:for-each-group>

          </ul>

      </xsl:where-populated>

  </xsl:template>

https://xsltfiddle.liberty-development.net/gWmuiKi/1 outputs

  <ul>

     <li>

        Δοκίμια : 1, here text may also exist

     </li>

     <li>

        Περικλής : 1, here text may also exist

     </li>

     <li>

        αρχαία : 1

     </li>

     <li>

        Ελλάδα : 1

     </li>

     <li>

        Η : 1

     </li>

     <li>

        Αθήνα : 1

     </li>

     <li>

        Νοέμβριος : 1

     </li>

     <li>

        Πλάτων : 1

     </li>

     <li>

        ιστορία : 1

     </li>

  </ul>

that way.

Of course identifying a "word" by simply tokenizing on white space is going to fail in mosts texts and languages, due to punctuation characters and language specific rules. But XSLT/XPath/XQuery regular expressions don't have a word break metacharacter anyway so somehow one has to use tokenize or analyze-string.