Validate XML Schema with xsd file in Cocoa?
I have some XML and an XML Schema in a local xsd file. The XML document does not contain any schema information. I want to validate the XML document against the xsd schema file in Cocoa (meaning I'd prefer something NS/CF/libxml based as opposed to an external library).
I can across xmllint, 开发者_如何学运维which would probably work, but I was looking for a way to do it without launching an external task.
If your xml document does not have a reference to the xml schema, you should add it yourself, then validate with NSXMLDocument validateAndReturnError:
method.
Here is an example of how to tweak the xml document to have a reference to the xsd. Obviously, you will have to adapt this code to have a reference to your local xsd file.
NSError *error = nil;
NSURL *xmlURL = [NSURL URLWithString:@"http://www.xmlschema.info/PO.xml"];
NSXMLDocument *document = [[NSXMLDocument alloc] initWithContentsOfURL:xmlURL options:NSXMLNodeOptionsNone error:NULL];
NSXMLNode *noNamespaceSchemaLocation = [NSXMLNode attributeWithName:@"xsi:noNamespaceSchemaLocation" stringValue:@"http://www.xmlschema.info/PO.xsd"];
NSXMLElement *rootElement = [document rootElement];
NSMutableArray *rootAttributes = [[rootElement attributes] mutableCopy];
[rootAttributes replaceObjectAtIndex:1 withObject:noNamespaceSchemaLocation];
[rootElement setAttributes:rootAttributes];
BOOL isValid = [document validateAndReturnError:&error];
if (isValid)
NSLog(@"document is valid");
else
NSLog(@"document is invalid: %@", [error localizedDescription]);
For reference:
Contents of http://www.xmlschema.info/PO.xml
<?xml version="1.0"?>
<purchaseOrder orderDate="1999-10-20" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="C:\microsite_images\po.xsd">
<shipTo country="US">
<name>Alice Smith</name>
<street>123 Maple Street</street>
<city>Mill Valley</city>
<state>CA</state>
<zip>90952</zip>
</shipTo>
<billTo country="US">
<name>Robert Smith</name>
<street>8 Oak Avenue</street>
<city>Old Town</city>
<state>PA</state>
<zip>95819</zip>
</billTo>
<comment>Hurry, my lawn is going wild</comment>
<items>
<item partNum="872-AA">
<productName>Lawnmower</productName>
<quantity>1</quantity>
<USPrice>148.95</USPrice>
<comment>Confirm this is electric</comment>
</item>
<item partNum="926-AA">
<productName>Baby Monitor</productName>
<quantity>1</quantity>
<USPrice>39.98</USPrice>
<shipDate>1999-05-21</shipDate>
</item>
</items>
</purchaseOrder>
Contents of http://www.xmlschema.info/PO.xsd
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:annotation>
<xsd:documentation xml:lang="en">
Purchase order schema for Example.com.
Copyright 2000 Example.com. All rights reserved.
</xsd:documentation>
</xsd:annotation>
<xsd:element name="purchaseOrder" type="PurchaseOrderType"/>
<xsd:element name="comment" type="xsd:string"/>
<xsd:complexType name="PurchaseOrderType">
<xsd:sequence>
<xsd:element name="shipTo" type="USAddress"/>
<xsd:element name="billTo" type="USAddress"/>
<xsd:element ref="comment" minOccurs="0"/>
<xsd:element name="items" type="Items"/>
</xsd:sequence>
<xsd:attribute name="orderDate" type="xsd:date"/>
</xsd:complexType>
<xsd:complexType name="USAddress">
<xsd:sequence>
<xsd:element name="name" type="xsd:string"/>
<xsd:element name="street" type="xsd:string"/>
<xsd:element name="city" type="xsd:string"/>
<xsd:element name="state" type="xsd:string"/>
<xsd:element name="zip" type="xsd:decimal"/>
</xsd:sequence>
<xsd:attribute name="country" type="xsd:NMTOKEN"
fixed="US"/>
</xsd:complexType>
<xsd:complexType name="Items">
<xsd:sequence>
<xsd:element name="item" minOccurs="0" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="productName" type="xsd:string"/>
<xsd:element name="quantity">
<xsd:simpleType>
<xsd:restriction base="xsd:positiveInteger">
<xsd:maxExclusive value="100"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="USPrice" type="xsd:decimal"/>
<xsd:element ref="comment" minOccurs="0"/>
<xsd:element name="shipDate" type="xsd:date" minOccurs="0"/>
</xsd:sequence>
<xsd:attribute name="partNum" type="SKU" use="required"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
<!-- Stock Keeping Unit, a code for identifying products -->
<xsd:simpleType name="SKU">
<xsd:restriction base="xsd:string">
<xsd:pattern value="\d{3}-[A-Z]{2}"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:schema>
Well, xmllint is one of the libxml tools. The XSD validation part of xmllint is simply a small wrapper around the schema module of libxml - you can see the API here. I've used this from Cocoa myself.
Newt is correct. I have some open source Cocoa code that uses the libxml XSD API.
The project is here:
http://code.google.com/p/cocoatron/
Specifically this method:
- (void)doXSDValidation:(xmlDocPtr)source;
In this file:
http://code.google.com/p/cocoatron/source/browse/trunk/ValidateXMLDocuments/Validate%20XML%20Documents.m
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