Fix #227: Add xml:base to macros element

The `macros` element needs support for xml:base in order to use it in
xincluded files.

Author: cboehme

src/main/resources/schemata/metamorph.xsd

@@ -71,6 +71,7 @@
 				<element ref="tns:macro" />
 				<element ref="xi:include" />
 			</choice>
+			<attribute ref="xml:base" />
 		</complexType>
 	</element>
 

src/test/java/org/culturegraph/mf/morph/MacroTest.xml

@@ -236,4 +236,21 @@
 		</result>
 	</test-case>
 
+	<test-case name="Issue 227: Should support xinclude for macros">
+		<input type="text/x-formeta">
+			1 { lit: in }
+		</input>
+		<transformation type="text/x-metamorph+xml">
+			<mm:metamorph version="1">
+				<include xmlns="http://www.w3.org/2001/XInclude" href="issue227-should-support-xinclude-for-macros.xml" />
+				<mm:rules>
+					<mm:call-macro name="test-macro" />
+				</mm:rules>
+			</mm:metamorph>
+		</transformation>
+		<result type="text/x-formeta">
+			1 { lit: out }
+		</result>
+	</test-case>
+
 </metamorph-test>

src/test/java/org/culturegraph/mf/morph/issue227-should-support-xinclude-for-macros.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<macros xmlns="http://www.culturegraph.org/metamorph">
+	<macro name="test-macro">
+		<data source="lit">
+			<constant value="out" />
+		</data>
+	</macro>
+</macros>