How to insert in XSLT
XsltXslt Problem Overview
How can I insert
>
Into an XSLT stylesheet, I keep getting this error:
> XML Parsing Error: undefined entity
Essentially I want a non breaking space character in the XSLT Template.
Xslt Solutions
Solution 1 - Xslt
Use the entity code   instead.
is a HTML "character entity reference". There is no named entity for non-breaking space in XML, so you use the code  .
Wikipedia includes a list of XML and HTML entities, and you can see that there are only 5 "predefined entities" in XML, but HTML has over 200. I'll also point over to https://stackoverflow.com/questions/15798957/creating-a-space-nbsp-in-xsl which has excellent answers.
Solution 2 - Xslt
  works really well. However, it will display one of those strange characters in ANSI encoding. <xsl:text> worked best for me.
<xsl:text> </xsl:text>
Solution 3 - Xslt
One can also do this :
<xsl:text disable-output-escaping="yes"><![CDATA[ ]]></xsl:text>
Solution 4 - Xslt
Use this
<xsl:text disable-output-escaping="yes">&</xsl:text>nbsp;
edit: Downvoters should probably validate that this works first (it does, and is the most general solution to the problem.)
Solution 5 - Xslt
You might want to add the definition for this entity in the beginning of the file (below xml declaration):
<!DOCTYPE stylesheet [
<!ENTITY nbsp " " >
]>
Also you can add more entities such as Ntilde, Aacute, etc.
Solution 6 - Xslt
In addition to victor hugo's answer it is possible to get all known character references legal in an XSLT file, like this:
<!DOCTYPE stylesheet [
<!ENTITY % w3centities-f PUBLIC "-//W3C//ENTITIES Combined Set//EN//XML"
"http://www.w3.org/2003/entities/2007/w3centities-f.ent">
%w3centities-f;
]>
...
<xsl:text>& –</xsl:text>
There is also certain difference in the result of this approach as compared to <xsl:text disable-output-escaping="yes"> one. The latter is going to produce string literals like for all kinds of output, even for <xsl:output method="text">, and this may happen to be different from what you might wish... On the contrary, getting entities defined for XSLT template via <!DOCTYPE ... <!ENTITY ... will always produce output consistent with your xsl:output settings.
And when including all character references, it may be wise to use a local entity resolver to keep the XSLT engine from fetching character entity definitions from the Internet. JAXP or explicit Xalan-J users may need a patch for Xalan-J to use the resolver correctly. See my blog http://s-n-ushakov.blogspot.com/2011/09/xslt-entities-java-xalan.html">XSLT, entities, Java, Xalan... for patch download and comments.
Solution 7 - Xslt
XSLT stylesheets must be well-formed XML. Since " " is not one of the five predefined XML entities, it cannot be directly included in the stylesheet.
So coming back to your solution " " is a perfect replacement of " " you should use.
Example:
<xsl:value-of select="$txtFName"/> <xsl:value-of select="$txtLName"/>
Solution 8 - Xslt
When you use the following (without disable-output-escaping!) you'll get a single non-breaking space:
<xsl:text> </xsl:text>
Solution 9 - Xslt
I was trying to display borders on an empty cell in an HTML table. My old trick of using non-breaking space in empty cells was not working from xslt. I used line break with the same effect. I mention this just in case the reason you were trying to use the non-breaking space was to give some content to an 'empty' table cell in order to turn on the cell borders.
<br/>
Solution 10 - Xslt
you can also use:
<xsl:value-of select=" "/>
Solution 11 - Xslt
Try to use
<xsl:text> </xsl:text>
But it depends on XSLT processor you are using: the XSLT spec does not require XSLT processors to convert it into " ".
Solution 12 - Xslt
Although answer has been already provided by @brabster and others.
I think more reusable solution would be:
<xsl:variable name="space"> </xsl:variable>
...
<xsl:value-of select="$space"/>