xalan-2.7.2/src/main/java/org/apache/xalan/xsltc/runtime/AbstractTranslet.java [314:356]:
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    private final void buildIDIndex(DOM document) {
        setRootForKeys(document.getDocument());

        if (document instanceof DOMEnhancedForDTM) {
            DOMEnhancedForDTM enhancedDOM = (DOMEnhancedForDTM)document;
            
            // If the input source is DOMSource, the KeyIndex table is not
            // built at this time. It will be built later by the lookupId()
            // and containsId() methods of the KeyIndex class.
            if (enhancedDOM.hasDOMSource()) {
                buildKeyIndex(ID_INDEX_NAME, document);
                return;
            }
            else {
                final Hashtable elementsByID = enhancedDOM.getElementsWithIDs();

                if (elementsByID == null) {
            	    return;
                }

                // Given a Hashtable of DTM nodes indexed by ID attribute values,
                // loop through the table copying information to a KeyIndex
                // for the mapping from ID attribute value to DTM node
                final Enumeration idValues = elementsByID.keys();
                boolean hasIDValues = false;

                while (idValues.hasMoreElements()) {
            	    final Object idValue = idValues.nextElement();
            	    final int element =
                            document.getNodeHandle(
                                        ((Integer)elementsByID.get(idValue))
                                                .intValue());

            	    buildKeyIndex(ID_INDEX_NAME, element, idValue);
            	    hasIDValues = true;
                }

                if (hasIDValues) {
            	    setKeyIndexDom(ID_INDEX_NAME, document);
                }
            }
        }
    }
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xalan-2.7.1/src/main/java/org/apache/xalan/xsltc/runtime/AbstractTranslet.java [314:356]:
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    private final void buildIDIndex(DOM document) {
        setRootForKeys(document.getDocument());

        if (document instanceof DOMEnhancedForDTM) {
            DOMEnhancedForDTM enhancedDOM = (DOMEnhancedForDTM)document;
            
            // If the input source is DOMSource, the KeyIndex table is not
            // built at this time. It will be built later by the lookupId()
            // and containsId() methods of the KeyIndex class.
            if (enhancedDOM.hasDOMSource()) {
                buildKeyIndex(ID_INDEX_NAME, document);
                return;
            }
            else {
                final Hashtable elementsByID = enhancedDOM.getElementsWithIDs();

                if (elementsByID == null) {
            	    return;
                }

                // Given a Hashtable of DTM nodes indexed by ID attribute values,
                // loop through the table copying information to a KeyIndex
                // for the mapping from ID attribute value to DTM node
                final Enumeration idValues = elementsByID.keys();
                boolean hasIDValues = false;

                while (idValues.hasMoreElements()) {
            	    final Object idValue = idValues.nextElement();
            	    final int element =
                            document.getNodeHandle(
                                        ((Integer)elementsByID.get(idValue))
                                                .intValue());

            	    buildKeyIndex(ID_INDEX_NAME, element, idValue);
            	    hasIDValues = true;
                }

                if (hasIDValues) {
            	    setKeyIndexDom(ID_INDEX_NAME, document);
                }
            }
        }
    }
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