XHTML with embedded XQuery: how to deal with the DOCTYPE declaration? How to deal with the default XHTML namespaces?

Costello, Roger L. costello at mitre.org
Sat Mar 27 10:43:12 PST 2010

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XHTML with embedded XQuery: how to deal with the
DOCTYPE declaration? How to deal with the default XHTML namespaces?

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Hi Folks,

I am creating an XHTML document and embedding XQuery in it:

---------------------------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
    ...
</head>
<body>

    <h1>Our Solar System Planets</h1>

    <div id="planets">
      {
         for $i in //planet return
            ...
      }
    </div>
</body>
</html>
---------------------------------------------------------

Here is my XML document:

<?xml version="1.0" encoding="UTF-8"?>
<planets>
    <planet>
        ...
    </planet>
    ...
</planets>

Note that my XML document doesn't use namespaces.

                 
QUESTION #1

When I execute the XHTML document (containing XQuery) I get an error message regarding the DOCTYPE declaration:

Error on line 1 column 0 of planets.xq:
  XPST0003: XQuery syntax error in #<!D#:
    Expected '--' or '[CDATA[' after '<!'
Static error(s) in query

Do I need to do something special for DOCTYPE declarations?


QUESTION #2

After stripping out the DOCTYPE declaration, and then executing it, I still don't get the desired results. I discovered the reason: I have a default namespace declaration (the XHTML namespace):

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

My XQuery is trying to reference the planet elements in the XHTML namespace:

    for $i in //planet return

Here are two approaches to fix this problem:

(a) Explicitly qualify all the XHTML elements:

<xhtml:html xmlns:xhtml="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <xhtml:head>
        ...
    </xhtml:head>
    <xhtml:body>
       ...
</xhtml:html>

(b) Declare a null namespace, and then explicitly qualify the references to the planet elements:

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
      xmlns:p="">
    <head>
        ...
    </head>
    <body>
       for $i in //p:planet return
</html>

Neither approach is very attractive. Is there a better approach?

/Roger

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