My login history shows Failed: Assertion Invalid 
The SAML Assertion Validator says Unable to parse the response
XMLSpy says Unable to locate a reference to a supported schema type (DTD, W3C Schema) within this document instance.

I generate this response with C# and have used it in a previous project without problems. Any ideas on what I'm missing/doing wrong?

<samlp:Response ID="_E27F438B33756518E90C7E3AC535B439" Version="2.0" IssueInstant="2011-10-06T11:55:47Z" Destination="https://test.salesforce.com" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol">
	<saml:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">https://www.salesforce.com</saml:Issuer>
	<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
		<SignedInfo>
			<CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
			<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
			<Reference URI="#_E27F438B33756518E90C7E3AC535B439">
				<Transforms>
					<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
					<Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#">
						<InclusiveNamespaces PrefixList="#default saml ds xs xsi" xmlns="http://www.w3.org/2001/10/xml-exc-c14n#"/>
					</Transform>
				</Transforms>
				<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
				<DigestValue>En5W1EvQScxxBQRO7YHZO9rhitE=</DigestValue>
			</Reference>
		</SignedInfo>
		<SignatureValue>UQoEZIb9tEOmIsIsRIuxmR5m3PkTSAuvo2O4IZFetDLImgdLcyEgyFJMzLraYGDE2rwuh+CrXBDAiOQITXACZJzvlmu1J9LkS58yIhWR3ueuRCO9E/4qB0C6NVm+sMg8cLghri5Tkrmw/yEwjdxYpNhoK3C1FGLw6/vDWuMrUBQ=</SignatureValue>
		<KeyInfo>
			<X509Data>
				<X509Certificate>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</X509Certificate>
			</X509Data>
		</KeyInfo>
	</Signature>
	<samlp:Status>
		<samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
	</samlp:Status>
	<saml:Assertion Version="2.0" ID="_64A96C56928D068794CC29675229BC6E" IssueInstant="2011-10-06T11:55:47Z" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">
		<saml:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity">https://www.salesforce.com</saml:Issuer>
		<saml:Subject>
			<saml:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">user@company.com</saml:NameID>
			<saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
				<saml:SubjectConfirmationData NotOnOrAfter="2011-10-06T12:05:47Z" Recipient="https://test.salesforce.com"/>
			</saml:SubjectConfirmation>
		</saml:Subject>
		<saml:Conditions NotOnOrAfter="2011-10-06T12:05:47Z">
			<saml:AudienceRestriction>
				<saml:Audience>https://saml.salesforce.com</saml:Audience>
			</saml:AudienceRestriction>
		</saml:Conditions>
		<saml:AuthnStatement AuthnInstant="2011-10-06T11:55:47Z">
			<saml:AuthnContext>
				<saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:unspecified</saml:AuthnContextClassRef>
			</saml:AuthnContext>
		</saml:AuthnStatement>
	</saml:Assertion>
</samlp:Response>

Hello people,

I'm new to SF. As a business requirement I have written a web-service which is used to populate the fields of a custom object. 

I achieved this by embedding parameters in the URL as explained here.

The trouble is that SF does not support getting the field IDs dynamically at run time. There is support for custom objects though like below:

String pageId  = Schema.getGlobalDescribe().get('Customer_setup_form__c').getDescribe().getKeyPrefix();

But I was hoping that you could do something similar for custom fields too.

As a result I had to hardcode the ID of the custom fields which I’m passing in the values for: e.g.

https://cs4.salesforce.com/a1G/e?00NP0000000X7dg=France&00NP0000000X7ds=15+rue+de+l%27Hotel+de+Ville++

This works fine on the test sandbox. I now need to deploy this to our production server and therefore need to write unit test classes. I know for a fact that the ID of these custom controls will change once deployed to a different server. I have therefore 2 questions:

1)     Is there a better way of NOT hard-coding these IDs and use Apex to dynamically retrieve them at run time?

2)     The unit test will be my first one to write and I need to know if it will work with these hard-coded IDs?

 Many thanks,

Shane