framework/application/util/src/main/java/org/ldp4j/application/util/ImmutableNamespaces.java
@Override
	public String getPrefix(String namespaceURI) {
		for(Entry<String,String> entry:this.map.entrySet()) {
			if(entry.getValue().equals(namespaceURI)) {
				return entry.getKey();
			}
		}
		return null;
	}
@Override
	public String getPrefix(String namespaceURI) {
		for(Entry<String,String> entry:this.map.entrySet()) {
			if(entry.getValue().equals(namespaceURI)) {
				return entry.getKey();
			}
		}
		return null;
	}
{@inheritDoc}