From f7325ecbd88f632b79e63cace950fe99e3c046de Mon Sep 17 00:00:00 2001
From: Wendell Piez <wendell.piez@nist.gov>
Date: Thu, 12 Dec 2019 15:40:57 -0500
Subject: [PATCH] Addressing #12, supporting collapsibility of fields.

---
 ...llapsible-no-op_validation-schematron-FAIL |  0
 .../collapsible/collapsible_metaschema.xml    |  7 +++---
 .../oscal-m2/json/json-schema-metamap.xsl     | 23 ++++++++++++++++++-
 3 files changed, 25 insertions(+), 5 deletions(-)
 delete mode 100644 test-suite/schema-generation/collapsible/collapsible-no-op_validation-schematron-FAIL

diff --git a/test-suite/schema-generation/collapsible/collapsible-no-op_validation-schematron-FAIL b/test-suite/schema-generation/collapsible/collapsible-no-op_validation-schematron-FAIL
deleted file mode 100644
index e69de29bb..000000000
diff --git a/test-suite/schema-generation/collapsible/collapsible_metaschema.xml b/test-suite/schema-generation/collapsible/collapsible_metaschema.xml
index ec0c04dc5..0f64a236d 100644
--- a/test-suite/schema-generation/collapsible/collapsible_metaschema.xml
+++ b/test-suite/schema-generation/collapsible/collapsible_metaschema.xml
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- OSCAL CATALOG METASCHEMA -->
 <!-- validate with XSD and Schematron (linked) -->
-<?xml-model href="../../lib/metaschema-check.sch" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
 <?xml-stylesheet type="text/css" href="../../lib/metaschema-author.css"?>
+<?xml-model href="../../../toolchains/oscal-m2/lib/metaschema-check.sch" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
 <METASCHEMA xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://csrc.nist.gov/ns/oscal/metaschema/1.0 ../../../schema/metaschema.xsd"
- xmlns="http://csrc.nist.gov/ns/oscal/metaschema/1.0"
- xmlns:o="http://csrc.nist.gov/ns/oscal/example" root="parent">
+ xsi:schemaLocation="http://csrc.nist.gov/ns/oscal/metaschema/1.0 ../../../toolchains/oscal-m2/lib/metaschema.xsd"
+ xmlns="http://csrc.nist.gov/ns/oscal/metaschema/1.0" root="parent">
   <schema-name>Metaschema Unit Test: collapsible</schema-name>
   <schema-version>1.0-milestone1</schema-version>
   <short-name>metaschema-collapsible</short-name>
diff --git a/toolchains/oscal-m2/json/json-schema-metamap.xsl b/toolchains/oscal-m2/json/json-schema-metamap.xsl
index e351dc4e0..7414cd555 100644
--- a/toolchains/oscal-m2/json/json-schema-metamap.xsl
+++ b/toolchains/oscal-m2/json/json-schema-metamap.xsl
@@ -300,7 +300,28 @@
             </map>
         </xsl:if>
     </xsl:template>
-
+    
+    <xsl:template match="define-field[@collapsible='yes']" mode="properties">
+        <xsl:apply-templates mode="declaration" select="flag"/>
+        <xsl:variable name="this-key" as="xs:string?">
+            <xsl:apply-templates select="." mode="value-key"/>
+        </xsl:variable>
+        <xsl:if test="matches($this-key, '\S')">
+            <map key="{$this-key}">
+                <array key="anyOf">
+                    <map><string key="type">string</string></map>
+                    <map>
+                        <string key="type">array</string>
+                        <map key="items">
+                            <string key="type">string</string>
+                        </map>
+                        <number key="minItems">2</number>
+                    </map>
+                </array>
+            </map>
+        </xsl:if>
+    </xsl:template>
+    
     <!--A flag declared as a key or value key gets no declaration since it
     will not show up in the JSON as a separate property -->