python - XSLT select from a nested element -


i'm sure i'm missing simple here...

i can't select nested xml element using xlst transform.

here xml

<collection> <record>   <leader>01814nam a2200205ia 4500</leader>   <controlfield tag="003">psca</controlfield>   <controlfield tag="005">20141201150951.0</controlfield>   <controlfield tag="008">131110s9999    xx            000 0 und d</controlfield>   <datafield tag="040" ind1=" " ind2=" ">     <subfield code="a">psca</subfield>     <subfield code="c">calyx</subfield>   </datafield>   <datafield tag="110" ind1=" " ind2=" ">     <subfield code="9">76</subfield>     <subfield code="a">children's services central</subfield>   </datafield>   <datafield tag="245" ind1="0" ind2="0">     <subfield code="a">what's pedagogy anyway?</subfield>     <subfield code="b">using pedagogical  documentation engage  years learning  framework </subfield>   </datafield> </record> </collection

i need select following data:

/collection

/record

/datafield

-->/@tag='245'

---->/subfield/@code='a'

i expect output be: "what's pedagogy anyway?"

my xlst select node/data such:

<xsl:for-each select="collection/record/datafield">     <xsl:choose>         <xsl:when test="@tag=245">             <xsl:choose>                 <xsl:when test="/subfeild/@code=a">                     <xsl:value-of select="/subfeild"/>                 </xsl:when>              </xsl:choose>         </xsl:when>     </xsl:choose>  </xsl:for-each>

i'm running using lxml library in python if that's important. code compiles , runs without error. output null.

any ideas? in advance.

you might want change @code=a @code='a', such as:

 <xsl:template match="/">     <xsl:value-of select="collection/record/datafield[@tag=245]/subfield[@code='a']"/> </xsl:template>

edit

if insist on having for-each loop, see below:

<xsl:template match="/">     <xsl:for-each select="collection/record/datafield">         <xsl:choose>             <xsl:when test="@tag=245">                 <xsl:value-of select="subfield[@code='a']"/>             </xsl:when>         </xsl:choose>     </xsl:for-each> </xsl:template>

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