Is there a function in xslt that test whether a string is an entity or in a string there is an entity? Because I want to tag this entites.
Thanks.

XML entity references are expanded by the XML parser (that is, replaced by their replacement text) before the XSLT processor gets to see them. The data model defining what XSLT sees does not include entities. If you want to manipulate XML at this physical level you need a lower-level tool than XSLT.

One trick that's sometimes used is to modify the entity replacement text to include element tags, which are then visible to the XSLT processor.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

I see... Thanks.

This is xml file

<!DOCTYPE web-app SYSTEM "file:///entities.dtd">
<web-app id="WebApp_ID" version="2.4">
    <display-name>&lt;&eacute;
    hello</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>
</web-app>



in the XSL file
?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="text" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:template match="/">
            <xsl:for-each select="web-app/*">
                           <xsl:if test="name(.)='display-name'">
                                       <xsl:if test="contains(text(), '#233;')">
                                                   <xsl:text>yes</xsl:text>
                                       </xsl:if>
                           </xsl:if>
            </xsl:for-each>
    </xsl:template>
</xsl:stylesheet>

thanks for the help but I need it to be generic, that is any case of entity.

I have given only the sample. if you want to be generic then use regular expressions of xslt 2.0

i have tried to use it but as michael have said, the dtd has already been parsed so there will be no match for the entities.