src/main/java/org/apache/xmlbeans/impl/schema/BuiltinSchemaTypeSystem.java [979:995]:
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            case SchemaType.BTC_LANGUAGE:
                // we used to have ([a-zA-Z]{2}|[iI]-[a-zA-Z]+|[xX]-[a-zA-Z]{1,8})(-[a-zA-Z]{1,8})*", but s4s uses the more lenient pattern to the left.
                pattern = "[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*";
                hasPattern = true;
                break;
            case SchemaType.BTC_NMTOKEN:
                pattern = "\\c+";
                hasPattern = true;
                break;
            case SchemaType.BTC_NAME:
                pattern = "\\i\\c*";
                hasPattern = true;
                break;
            case SchemaType.BTC_NCNAME:
                pattern = "[\\i-[:]][\\c-[:]]*";
                hasPattern = true;
                break;
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src/main/java/org/apache/xmlbeans/impl/schema/XQuerySchemaTypeSystem.java [1011:1026]:
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            case SchemaType.BTC_LANGUAGE:
                pattern = "[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*"; // we used to have ([a-zA-Z]{2}|[iI]-[a-zA-Z]+|[xX]-[a-zA-Z]{1,8})(-[a-zA-Z]{1,8})*", but s4s uses the more lenient pattern to the left.
                hasPattern = true;
                break;
            case SchemaType.BTC_NMTOKEN:
                pattern = "\\c+";
                hasPattern = true;
                break;
            case SchemaType.BTC_NAME:
                pattern = "\\i\\c*";
                hasPattern = true;
                break;
            case SchemaType.BTC_NCNAME:
                pattern = "[\\i-[:]][\\c-[:]]*";
                hasPattern = true;
                break;
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