schema/ListedLicense: Move standardLicenseHeader under text as fileGrant

Two changes here:

* Rename standardLicenseHeader -> fileGrant.  "License" is redundant
  as long as we only include these for licenses, and would be
  incorrect if/when we start supplying these for exceptions.
  "standard" is also redundant as long as we are requiring these to
  come from the license text itself (more on that below).  "header"
  alone might be confused with <h1>, etc., and is about where the
  content shows up.  fileGrant, on the other hand, is about what the
  content *is*.  In fact, the GPL family grants are generic enough to
  be applied at the program level (as well as per-file), but the
  file-specific "fileGrant" is more specific for licenses like
  Apache-2.0 whose text only makes sense in a per-file context.

* Make the fileGrant element a descendant of the text element (it used
  to be a sibling).  We may restore the possibility of siblings later,
  but for now, the ancestor requirement makes it easy to enforce [1]:

    F) Standard License Header

    * Should only include text intended to be put in the header of
      source files or other files as specified in the license or
      license appendix when specifically delineated
    ...
    * Leave this field blank if there is no standard header as
      specifically defined in the license

  This also makes it easy to cover licenses where the license text and
  fileGrant are identical (e.g. the BSDs and the OFL [2]), because you
  can use:

    <text>
      <fileGrant>
        ...
      </fileGrant>
    <text>

[1]: https://spdx.org/spdx-license-list/license-list-overview#fields
[2]: spdx#451

Author: wking

schema/ListedLicense.xsd

@@ -32,8 +32,7 @@
 		<all>
 			<element name="crossRefs" type="tns:crossRefsType" minOccurs="0" maxOccurs="1"/>
 			<element name="notes" type="tns:formattedFixedTextType" minOccurs="0" maxOccurs="1"/>
-			<element name="standardLicenseHeader" type="tns:formattedAltTextType" minOccurs="0" maxOccurs="1"/>
-			<element name="text" type="tns:formattedAltTextType" minOccurs="0" maxOccurs="1"/>
+			<element name="text" type="tns:formattedAltFileGrantTextType" minOccurs="0" maxOccurs="1"/>
 		</all>
 		<attribute name="licenseId" type="string" use="required" />
 		<attribute name="isOsiApproved" type="boolean"/>
@@ -55,19 +54,31 @@
 	<complexType name="optionalType" mixed="true">
 		<group ref="tns:formattedAltTextGroup" minOccurs="0" maxOccurs="unbounded"/>
 	</complexType>
+	<complexType name="optionalFileGrantType" mixed="true">
+		<group ref="tns:formattedAltFileGrantTextGroup" minOccurs="0" maxOccurs="unbounded"/>
+	</complexType>
 	<complexType name="listType">
 		<choice minOccurs="1" maxOccurs="unbounded">
 			<element name="item" type="tns:formattedAltTextType"/>
 			<element name="list" type="tns:listType"/>
 		</choice>
 	</complexType>
+	<complexType name="listFileGrantType">
+		<choice minOccurs="1" maxOccurs="unbounded">
+			<element name="item" type="tns:formattedAltFileGrantTextType"/>
+			<element name="list" type="tns:listFileGrantType"/>
+		</choice>
+	</complexType>
 	<complexType name="emptyType"/>
 	<complexType name="formattedFixedTextType" mixed="true">
 		<group ref="tns:formattedFixedTextGroup" minOccurs="0" maxOccurs="unbounded"/>
 	</complexType>
 	<complexType name="formattedAltTextType" mixed="true">
 		<group ref="tns:formattedAltTextGroup" minOccurs="0" maxOccurs="unbounded"/>
 	</complexType>
+	<complexType name="formattedAltFileGrantTextType" mixed="true">
+		<group ref="tns:formattedAltFileGrantTextGroup" minOccurs="0" maxOccurs="unbounded"/>
+	</complexType>
 	<group name="formattedFixedTextGroup">
 		<choice>
 			<element name="p" type="tns:formattedFixedTextType" minOccurs="0" maxOccurs="unbounded"/>
@@ -90,4 +101,17 @@
 			<element name="copyrightText" type="tns:formattedAltTextType" minOccurs="0" maxOccurs="1"/>
 		</choice>
 	</group>
+	<group name="formattedAltFileGrantTextGroup">
+		<choice>
+			<element name="p" type="tns:formattedAltFileGrantTextType" minOccurs="0" maxOccurs="unbounded"/>
+			<element name="bullet" type="string" minOccurs="0" maxOccurs="unbounded"/>
+			<element name="list" type="tns:listFileGrantType" minOccurs="0" maxOccurs="unbounded"/>
+			<element name="optional" type="tns:optionalFileGrantType" minOccurs="0" maxOccurs="unbounded"/>
+			<element name="alt" type="tns:altType" minOccurs="0" maxOccurs="unbounded"/>
+			<element name="br" type="tns:emptyType" minOccurs="0" maxOccurs="unbounded"/>
+			<element name="titleText" type="tns:formattedAltTextType" minOccurs="0" maxOccurs="1"/>
+			<element name="copyrightText" type="tns:formattedAltTextType" minOccurs="0" maxOccurs="1"/>
+			<element name="fileGrant" type="tns:formattedAltTextType" minOccurs="0" maxOccurs="1"/>
+		</choice>
+	</group>
 </schema>