Re: XPath Query Exressions and Quote Characters

It's just a coincidence that I used xml:id as part of my query expression. If I use following code method to build my expression: $query = '//book/chapter[section="' . $section . '"]'; or say $query = '//book/chapter[@title="' . $title . '"]'; I get an "Invalid Predicate..." error when either the $section or $title variable contains a double quote. However, here's an example: XML: <?xml version="1.0" encoding="UTF-8"?> <table> <row>

       <mod_id>home</mod_id>
       <mod_access>1</mod_access>
       <mod_name>"Home"</mod_name>

</row> </table> XPath Expression: $query = '//table/row[mod_name="' . $name . '"]'; Variable Assignment: $name = utf_encode('"Home"'); Using the expression throws the "Invalid Predicate" Error. On 2005-03-16 12:06:24 -0500, jason.barnett@telesuite.com (Jason Barnett) said:

C Drozdowski wrote: ...

$query = '//book/chapter' . '[@xml:id="' . $id . '"]';

First of all check the XPath documentation: http://www.w3.org/TR/xpath http://www.w3.org/TR/xpath#path-abbrev AFAIK your expression above is the way to build this query. Give us a link to the XML doc if you want us to take a look at that specific doc. Also make sure you referenced the correct DTD. And (just to be sure) try to validate you document against the DTD.

Given this expression, if $id contains one or more single quotes, an error is thrown. $query = "//book/chapter[@xml:id='$id']"; I need to be able to build an exression that contains either double or single quotes in the search regarding of how I programatically build the expression.

A couple of things that may be in play here... - First of all I recall there was a specific bug with xml:id, although I can't recall off the top of my head what it was... - Secondly the XPath querying interface in PHP will only return simple data at this point. In fact, I think it will only return strings. http://www.w3.org/TR/xpath#attribute-nodes But if your ID is simple data (integer / string), I can't imagine it would be a problem for XPath to return it.