Convert ODT to single XML file

I know that standards define two versions of O开发者_运维技巧DT file: - one is a archive of different files, i.e. meta.xml, content.xml etc, - second is one big XML file with all the data. (I know above from http://en.wikipedia.org/wiki/OpenDocument_technical_specification#Document_Representation)

The latter version is better for processing, but unfortunately is not produced by OpenOffice.

The question is: Do you know any filter, converter, or anything what would help me transform ODT file in archive version into single XML file? The best would be a Java class.

Both Open Office and Libre Office does can produce ODT files in the "one big XML" format. They are called "Flat ODT" files.

Open an ODT file and use "Save as…". From there you can change the file format to "Flat ODT".

I solved the case by producing XSLT stylesheet that transforms ODT source files into one XML file "more or less" compatible with the standard. Below is the code.

<?xml version="1.0" encoding="UTF-8"?>
    <xsl:stylesheet version="1.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0">

        <xsl:param name="meta.file" select="'meta.xml'" /> 

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

        <xsl:template match="office:document-content">
            <office:document>
                <xsl:copy-of select="@*" />
                <xsl:variable name="meta" select="document($meta.file)/office:document-meta/office:meta" />
                <xsl:copy-of select="$meta" />
                <xsl:apply-templates />
            </office:document>
        </xsl:template>

    </xsl:stylesheet>