Shallow copy and base URI

  Hi

  I have a little question about identity copy and base URI.
I have a module for the first pass of my pocessing, that
uses identity copy (and remove some elements).  That
intermediate result is put in a variable:

    <xsl:variable name="tree">
      <xsl:apply-templates mode="the.mode"/>
    </xsl:variable>

  The children of the document node are elements created by
xsl:copy.  The source document and the stylesheets are in
different directories.  The source tree (and thus the $tree
document node) can have descendants whose the @href is a
possibly relative URI that have to be used by fn:doc().

  But XSLT2/'11.9.1 says:

    The base URI of a node is copied. However, if the copied
    node is subsequently attached as a child to a new
    element, the final copy of the node inherits its base
    URI from its parent node, unless this is overridden
    using an xml:base attribute.

  Is "to a new element" including document nodes?  It is not
clear to me (I'd say no), but is what I observe with Saxon.
So without explicitely set the base URI, the base URI become
the one of the xsl:variable element.

  So how to set the base URI correctly?  I can't do the
following, because in the first one can't create an
attribute as child of a document node and in the second one
the xml:base value is not a correct URI:

    <xsl:variable name="tree">
      <xsl:attribute name="xml:base" select="base-uri()"/>
      <xsl:apply-templates mode="the.mode"/>
    </xsl:variable>

    <xsl:variable name="tree">
      <tree xml:base="{base-uri()}">
        <xsl:apply-templates mode="the.mode"/>
      </tree>
    </xsl:variable>

  So the only way to achive my goal is to use the following:

    <xsl:variable name="tree">
      <tree>
        <xsl:attribute name="xml:base" select="base-uri()"/>
        <xsl:apply-templates mode="the.mode"/>
      </tree>
    </xsl:variable>

  Or to have exactly the same result as expected at the
beginning, I have to use a temporary variable (to avoid to
create a document node):

    <xsl:variable name="tmp.tree">
      <tree>
        <xsl:attribute name="xml:base" select="base-uri()"/>
        <xsl:apply-templates mode="the.mode"/>
      </tree>
    </xsl:variable>

    <xsl:variable name="tree" select="$tmp.tree/tree/*"/>

  Is all this right?  Are document nodes concerned by the
paragraph cited above?  Is there a simpler way to achieve
the original goal?

  Thanks.  Regards,

--drkm



















	

	
		
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