improved siReal handling

src/dccQuantity.js

 // src/dccQuantity.js
 import { DSIUnit } from "dsiunits-js/src/dsiUnit.js";
-// Import the unit input component if needed:
-// import "dsi-units-js-lib/src/dsiUnitInput.js";
 
-/**
- * Base class for a DCC quantity.
- * Holds a pointer to the original JSON data.
- */
 export class DCCQuantity {
     constructor(jsonData) {
         this.jsonData = jsonData;
     }
 
-    /**
-     * Returns the refType attribute of the quantity.
-     */
     getRefType() {
         return (this.jsonData.$ && this.jsonData.$.refType) ? this.jsonData.$.refType : '';
     }
 
-    /**
-     * Returns the quantity name in the specified language.
-     * @param {string} language - e.g., 'en', 'de'
-     */
     getName(language) {
         const nameData = this.jsonData['dcc:name'];
         if (!nameData) return '';
@@ -30,23 +17,16 @@ export class DCCQuantity {
         if (Array.isArray(content)) {
             const match = content.find(item => item.$ && item.$.lang === language) || content[0];
             return match._ || match;
-        } else {
-            return content._ || content;
         }
+        return content._ || content;
     }
 }
 
-/**
- * Class for quantities represented by <si:realListXMLList>.
- */
 export class DCCRealListQuantity extends DCCQuantity {
     constructor(jsonData) {
         super(jsonData);
     }
 
-    /**
-     * Extracts and returns an array of numeric values.
-     */
     getValues() {
         const realList = this.jsonData['si:realListXMLList'];
         if (realList && realList['si:valueXMLList']) {
@@ -58,26 +38,20 @@ export class DCCRealListQuantity extends DCCQuantity {
         return [];
     }
 
-    /**
-     * Returns the unit string rendered as HTML using the dsi-units-js library.
-     */
     getUnit() {
         const realList = this.jsonData['si:realListXMLList'];
         if (realList && realList['si:unitXMLList']) {
             const rawUnit = realList['si:unitXMLList'].trim();
             const unit = new DSIUnit(rawUnit);
-            // Render the unit in a one-line format
             return unit.toHTML({ oneLine: true });
         }
         return '';
     }
 
-    /**
-     * Extracts and returns an array of uncertainty values.
-     */
     getUncertainty() {
         const realList = this.jsonData['si:realListXMLList'];
         if (
+            realList &&
             realList['si:measurementUncertaintyUnivariateXMLList'] &&
             realList['si:measurementUncertaintyUnivariateXMLList']['si:expandedMUXMLList'] &&
             realList['si:measurementUncertaintyUnivariateXMLList']['si:expandedMUXMLList']['si:valueExpandedMUXMLList']
@@ -89,19 +63,12 @@ export class DCCRealListQuantity extends DCCQuantity {
     }
 }
 
-/**
- * Class for quantities represented by a single <si:real>.
- * (This class is provided for completeness and may be expanded as needed.)
- */
 export class DCCRealQuantity extends DCCQuantity {
     constructor(jsonData) {
         super(jsonData);
     }
 
-    /**
-     * Returns the numeric value from the <si:real> element.
-     */
-    getValue() {
+    getValues() {
         const realData = this.jsonData['si:real'];
         if (realData && realData['si:value']) {
             return parseFloat(realData['si:value']);
@@ -109,9 +76,6 @@ export class DCCRealQuantity extends DCCQuantity {
         return null;
     }
 
-    /**
-     * Returns the unit rendered as HTML.
-     */
     getUnit() {
         const realData = this.jsonData['si:real'];
         if (realData && realData['si:unit']) {
@@ -121,4 +85,17 @@ export class DCCRealQuantity extends DCCQuantity {
         }
         return '';
     }
-}
\ No newline at end of file
+    getUncertainty() {
+        const realList = this.jsonData['si:real'];
+        if (
+            realList &&
+            realList['si:measurementUncertaintyUnivariate'] &&
+            realList['si:measurementUncertaintyUnivariate']['si:expandedMU'] &&
+            realList['si:measurementUncertaintyUnivariate']['si:expandedMU']['si:valueExpandedMU']
+        ) {
+            const errStr = realList['si:measurementUncertaintyUnivariate']['si:expandedMU']['si:valueExpandedMU'];
+            return errStr.trim().split(/\s+/).map(v => parseFloat(v));
+        }
+        return [];
+    }
+}