move an element to another element or create a new one if it does not exist using xslt-3 - xslt-3.0

Question

using xslt 3, i need to take all content elements' values, and move them to the title elements (if the title elements already exist in a record, they need to be appended with a separator like -) i now have inputted my real data, since the below solution does not solve the problem when implemented to something like:
example input:
<data>
<RECORD ID="31365">
<no>25099</no>
<seq>0</seq>
<date>2/4/2012</date>
<ver>2/4/2012</ver>
<access>021999</access>
<col>GS</col>
<call>889</call>
<pr>0</pr>
<days>0</days>
<stat>0</stat>
<ch>0</ch>
<title>1 title</title>
<content>1 content</content>
<sj>1956</sj>
</RECORD>
<RECORD ID="31366">
<no>25100</no>
<seq>0</seq>
<date>2/4/2012</date>
<ver>2/4/2012</ver>
<access>022004</access>
<col>GS</col>
<call>8764</call>
<pr>0</pr>
<days>0</days>
<stat>0</stat>
<ch>0</ch>
<sj>1956</sj>
<content>1 title</content>
</RECORD>
</data>
expected output:
<data>
<RECORD ID="31365">
<no>25099</no>
<seq>0</seq>
<date>2/4/2012</date>
<ver>2/4/2012</ver>
<access>021999</access>
<col>GS</col>
<call>889</call>
<pr>0</pr>
<days>0</days>
<stat>0</stat>
<ch>0</ch>
<title>1 title - 1 content</title>
<sj>1956</sj>
</RECORD>
<RECORD ID="31366">
<no>25100</no>
<seq>0</seq>
<date>2/4/2012</date>
<ver>2/4/2012</ver>
<access>022004</access>
<col>ΓΣ</col>
<call>8764</call>
<pr>0</pr>
<days>0</days>
<stat>0</stat>
<ch>0</ch>
<sj>1956</sj>
<title>1 title</title>
</RECORD>
<data>
with my attempt, i did not manage to move the elements, i just got an empty line where the content element existed, so please add the removal of blank lines in the suggested solution.
i believe the removal of blank lines could be fixed with the use of
<xsl:template match="text()"/>

Answer 1

One way to achieve this is the following template. It uses XSLT-3.0 content value templates.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="3.0" expand-text="true">
<xsl:output method="xml" indent="yes" />
<xsl:mode on-no-match="shallow-copy" />
<xsl:strip-space elements="*" /> <!-- Remove space between elements -->
<xsl:template match="RECORD">
<xsl:copy>
<xsl:copy-of select="#*" />
<title>{title[1]}{if (title[1]) then ' - ' else ''}<xsl:value-of select="content" separator=" " /></title>
<xsl:apply-templates select="node() except (title,content)" />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
It's output is as desired.
If you want to separate the <content> elements with a -, too, you can simplify the core <title> expression to
<xsl:value-of select="title|content" separator=" - " />
EDIT:
All I changed was replacing chapter with RECORD, and it's working fine with Saxon-HE 9.9.1.4J. The only difference in the output is that the title element is always at the first position, but that shouldn't matter. I also added a directive to remove space between elements.