[xsl] block selection question (XSLT 1.0)

Hello,

I know that this is basic but I cannot get it done correctly.

Input:
<lines>
  <line></line>
  <line>A1</line>
  <line>1</line>
  <line>B1</line>
  <line></line>
  <line>A2</line>
  <line>2</line>
  <line>2</line>
  <line>2</line>
  <line>B2</line>
  <line></line>
  <line></line>
</lines>

Intended output (blockwise, start at A, all including next B):
<line>A1</line>
<line>1</line>

<line>A2</line>
<line>2</line>
<line>2</line>
<line>2</line>


This 
    <xsl:for-each select="/lines/line[contains(.,'A')]">
      <xsl:copy-of select="."/>
    </xsl:for-each>
gives
<line>A1</line>
<line>A2</line>

And this output is too much (double output of 2nd block)
$ xsltproc y.xsl lines.xml | tidy -q -xml
<line>A1</line>
<line>1</line>
<line />
<line>A2</line>
<line>2</line>
<line>2</line>
<line>2</line>
<line />
<line />
<line>A2</line>
<line>2</line>
<line>2</line>
<line>2</line>
<line />
<line />

$ cat y.xsl
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
>
  <xsl:output omit-xml-declaration="yes"/>

  <xsl:template match="/">
    <xsl:for-each select="/lines/line[contains(.,'A')]">
      <xsl:copy-of select="."/>
      <xsl:copy-of select="following-sibling::*[not(contains(.,'B'))]"/>
    </xsl:for-each>
  </xsl:template>
 
</xsl:stylesheet>
$ 

I tried making use of "preceding-sibling::*" at different places without 
success sofar.
Any help is appreciated.


Mit besten Gruessen / Best wishes,

Hermann Stamm-Wilbrandt
Developer, XML Compiler, L3
Fixpack team lead
WebSphere DataPower SOA Appliances
https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/
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