Appending NSMutableStrings - Exepected "." before "." token error - nsmutablearray

Question

I'm not sure what I'm doing wrong. I'm thinking its because the NSMutableArray's *name and *field are declared in a different file.
#import <Foundation/Foundation.h>
#interface xmlToUrl : NSObject {
NSString *base_url;
NSMutableArray *field;
NSMutableArray *name;
}
#property(nonatomic,retain)NSString *base_url;
#property(nonatomic, retain)NSMutableArray *field;
#property(nonatomic, retain)NSMutableArray *name;
#end
and
#import "xmlToUrl.h"
#implementation xmlToUrl
#synthesize base_url;
#synthesize field;
#synthesize name;
-(id) init
{
self = [super init];
if (self) {
field = [[NSMutableArray alloc] init];
name = [[NSMutableArray alloc] init];
}
return self;
}
-(void)dealloc
{
[base_url release];
[field release];
[name release];
[super dealloc];
}
#end
The NSMutableArrays are filled in the ViewController class:
//nodeContent is just a NSMutableString being added to the *name and *field NSMutableArrays
if([ending isEqualToString:#"name"]){
if(![nodeContent isEqualToString:#""])
{[xmlToUrlObject.name addObject:nodeContent];}
}
else if([ending isEqualToString:#"field"]){
if(![nodeContent isEqualToString:#""])
{[xmlToUrlObject.field addObject:nodeContent];}
Error = Expected '.' before '.' token. (on the first line of the code below)
What I want for output: *url string contains base_url, urlPart2, and urlPart3 all joined in order.
ex:
base_url = #"www."
urlPart2 = #"mywebsite"
urlPart3 = #".com"
url = #"www.mywebsite.com"
//xmlToUrl is an instance of its own class (.m file) It contains the *name and *field NSMutableArray
//xmlToUrl.h is inherited in this file
NSMutableString *urlPart2 = [xmlToUrl.name objectAtIndex: 0];
[xmlToUrl.name removeObjectAtIndex:0];
NSMutableString *url = [xmlToUrl.base_url stringByAppendingString:urlPart2];
if([xmlToUrl.field count] != 0)
{NSMutableString *urlPart3 = [xmlToUrl.field objectAtIndex: 0];
[xmlToUrl.field removeObjectAtIndex:0}
url = [url stringByAppendingString:urlPart3];
[urlPart2 release];
[urlPart3 release];

Answer 1

You are trying to access a property on a class, and not on the instance:
#interface xmlToUrl : NSObject {
and
NSMutableString *urlPart2 = [xmlToUrl.name objectAtIndex: 0];
You can only access the property on an instance of xmlToUrl, just like you do in the following line of code:
{[xmlToUrlObject.name addObject:nodeContent];}
Here, xmlToUrlObject is an instance, and not the class.