A representation of the XML RetrievalMethod element as
defined in the
W3C Recommendation for XML-Signature Syntax and Processing.
A RetrievalMethod object is used to convey a reference to
KeyInfo information that is stored at another location.
The XML schema definition is defined as:
<element name="RetrievalMethod" type="ds:RetrievalMethodType"/>
<complexType name="RetrievalMethodType">
<sequence>
<element name="Transforms" type="ds:TransformsType" minOccurs="0"/>
</sequence>
<attribute name="URI" type="anyURI"/>
<attribute name="Type" type="anyURI" use="optional"/>
</complexType>
A RetrievalMethod instance may be created by invoking one of the
{@link KeyInfoFactory#newRetrievalMethod newRetrievalMethod} methods
of the {@link KeyInfoFactory} class, and passing it the URI
identifying the location of the KeyInfo, an optional type URI identifying
the type of KeyInfo, and an optional list of {@link Transform}s; for example:
KeyInfoFactory factory = KeyInfoFactory.getInstance("DOM");
RetrievalMethod rm = factory.newRetrievalMethod
("#KeyValue-1", KeyValue.DSA_TYPE, Collections.singletonList(Transform.BASE64));
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