Proper way to construct an Attribute NSXMLNode so that its prefix is included in its XMLString
Proper way to construct an Attribute NSXMLNode so that its prefix is included in its XMLString
- Subject: Proper way to construct an Attribute NSXMLNode so that its prefix is included in its XMLString
- From: Heath Borders <email@hidden>
- Date: Mon, 07 Mar 2011 11:42:19 -0600
I have the following NSXMLDocument:
<document xmlns="http://example.com/document";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
</document>
I want to add an xsi:schemaLocation to the document so that I can validate it.
The documentation says:
attributeWithName:URI:stringValue:
Returns an NSXMLNode object representing an attribute node with a
given qualified name and string.
+ (id)attributeWithName:(NSString *)name URI:(NSString *)URI
stringValue:(NSString *)value
Parameters
name
A string that is the name of an attribute.
URI
A URI (Universal Resource Identifier) that qualifies name.
value
A string that is the value of the attribute.
Return Value
An NSXMLNode object of kind NSXMLAttributeKind or nil if the object
couldn't be created.
Discussion
For example, in the attribute “bst:id=`12345’”, “bst” is the name
qualifier (derived from the URI), “id” is the attribute name, and
“12345” is the attribute value.
Thus, I do the following:
NSXMLElement rootXmlElement = ...
NSXMLNode *schemaLocationAttributeXmlNode =
[NSXMLNode attributeWithName:@"schemaLocation" URI:@"xsi"
stringValue:@"http://example.com/document document.xsd"];
[rootXmlElement addAttribute:schemaLocationAttributeXmlNode];
However, this yields the following xml:
<document xmlns="http://example.com/document";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
schemaLocation=@"http://example.com/document document.xsd">
</document>
Notice that there should be an "xsi" prefix on the "schemaLocation" attribute.
and if I call try to get the attribute from the rootXmlElement, I get nothing:
[rootXmlElement attributeForLocalName:@"schemaLocation"
URI:@"http://www.w3.org/2001/XMLSchema-instance";] == nil
Since this didn't work, I tried using the namespace URI instead of the
prefix when creating the attribute:
NSXMLElement rootXmlElement = ...
NSXMLNode *schemaLocationAttributeXmlNode =
[NSXMLNode attributeWithName:@"schemaLocation"
URI:@"http://www.w3.org/2001/XMLSchema-instance";
stringValue:@"http://example.com/document document.xsd"];
[rootXmlElement addAttribute:schemaLocationAttributeXmlNode];
This still yielded bad xml:
<document xmlns="http://example.com/document";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
schemaLocation=@"http://example.com/document document.xsd">
</document>
However, this time I can at least get the attribute from my rootXmlElement:
[rootXmlElement attributeForLocalName:@"schemaLocation"
URI:@"http://www.w3.org/2001/XMLSchema-instance";] != nil // closer!
So, now, I tried specifying the prefix in the attribute name when
creating the attribute:
NSXMLElement rootXmlElement = ...
NSXMLNode *schemaLocationAttributeXmlNode =
[NSXMLNode attributeWithName:@"xsi:schemaLocation"
URI:@"http://www.w3.org/2001/XMLSchema-instance";
stringValue:@"http://example.com/document document.xsd"];
[rootXmlElement addAttribute:schemaLocationAttributeXmlNode];
Success! I got good xml:
<document xmlns="http://example.com/document";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation=@"http://example.com/document document.xsd">
</document>
This doesn't seem consistent with the documentation. Am I hacking here?
Thanks!
-Heath Borders
email@hidden
Twitter: heathborders
http://heath-tech.blogspot.com
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