Renaming nodes and values ​​using xslt

Question

I am new to xslt and I have a task on which I am not quite sure where to go. I want to rename nodes, but I support the format of all node declarations. In the actual context, I will apply this, I will do a series of renames like this, but for brevity, the sample I wrote includes only the renaming of one node. I am using XSL 1.0.

Input:

<variables>
  <var>
    <RENAME> a </RENAME>
  </var>
  <var RENAME='b'/>
  <var>
    <DO_NOT_TOUCH> c </DO_NOT_TOUCH>
  </var>
  <var DO_NOT_TOUCH='d'/>
</variables>

Desired Result:

<variables>
  <var>
    <DONE> a </DONE>
  </var>
  <var DONE='b'/>
  <var>
    <DO_NOT_TOUCH> c </DO_NOT_TOUCH>
  </var>
  <var DO_NOT_TOUCH='d'/>
</variables>

My xslt:

<xsl:template match="RENAME">
        <RENAMED>
                <xsl:apply-templates select="@*|node()"/>
        </RENAMED>
</xsl:template>

<xsl:template match="@*|node()">
        <xsl:copy>
                <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
</xsl:template>

Current output

<variables>
  <var>
    <RENAMED> a </RENAMED>
  </var>
  <var RENAME="b">
  </var>
  <var>
    <DO_NOT_TOUCH> c </DO_NOT_TOUCH>
  </var>
  <var DO_NOT_TOUCH="d">
  </var>
</variables>

Answer 1

<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" indent="yes"/>
    <xsl:template match="@* | node()">
        <xsl:copy>
            <xsl:apply-templates select="@* | node()"/>
        </xsl:copy>
    </xsl:template>
    <xsl:template match="RENAME">
        <DONE>
            <xsl:apply-templates select="@* | node()"/>
        </DONE>
    </xsl:template>
    <xsl:template match="@RENAME">
        <xsl:attribute name="DONE">
            <xsl:value-of select="."/>
        </xsl:attribute>
    </xsl:template>
</xsl:stylesheet>

Result versus your sample:

<variables>
    <var>
        <DONE> a </DONE>
    </var>
    <var DONE="b"></var>
    <var>
        <DO_NOT_TOUCH> c </DO_NOT_TOUCH>
    </var>
    <var DO_NOT_TOUCH="d"></var>
</variables>

Answer 2

This might work as well, but I think a different answer is better. Just thought I was offering my two cents.

<xsl:variable name="Foo" select="DONE"/>

<variables>
  <var>
    <xsl:element name="{$Foo}"> a </xsl:element>
  </var>
  <var DONE='b'/>
  <var>
    <DO_NOT_TOUCH> c </DO_NOT_TOUCH>
  </var>
  <var DO_NOT_TOUCH='d'/>
</variables>