docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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+---
+id: php-ajax-xml
+title: "PHP AJAX XML"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["AJAX DOM XML", "PHP AJAX XML 연동"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "ajax", "xml", "dom"]
+raw_sources: ["https://www.w3schools.com/php/php_ajax_xml.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP AJAX XML]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The PHP endpoint has to do a two-step DOM search to find related data — first locate the `<ARTIST>` node matching the query, THEN walk UP to its `parentNode` to reach the sibling elements (title, year, etc.) that describe the same CD — because XML's tree structure means "find the artist" and "find everything about that artist's CD" are two separate traversal operations. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Same AJAX skeleton** — `onchange` + `XMLHttpRequest`, identical pattern to the database example. [S1]
+- **PHP-side XML search via `DOMDocument`** — `$xmlDoc->load("cd_catalog.xml"); $x = $xmlDoc->getElementsByTagName('ARTIST');` finds all artist nodes. [S1]
+- **`nodeType == 1`** — filters for actual ELEMENT nodes, excluding whitespace text nodes (same gotcha noted in the DOM Parser chapter). [S1]
+- **`->parentNode`** — navigates from a matched child node back up to its parent, to reach sibling data (title, year, price, etc. of the same CD). [S1]
+- **Building the response by iterating siblings** — once the parent CD node is found, its `childNodes` are looped to output each field. [S1]
+
+## 📖 세부 내용 (Details)
+- Finding the matching artist's parent CD node: `$x = $xmlDoc->getElementsByTagName('ARTIST'); for ($i=0; $i<=$x->length-1; $i++) { if ($x->item($i)->nodeType==1) { if ($x->item($i)->childNodes->item(0)->nodeValue == $q) { $y=($x->item($i)->parentNode); } } }`. [S1]
+- Outputting all sibling fields of the matched CD: `$cd=($y->childNodes); for ($i=0;$i<$cd->length;$i++) { if ($cd->item($i)->nodeType==1) { echo("<b>" . $cd->item($i)->nodeName . ":</b> "); echo($cd->item($i)->childNodes->item(0)->nodeValue); echo("<br>"); } }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — CD 카탈로그 XML에서 아티스트명으로 검색해 앨범 정보를 반환하는 것이 DOM 기반 XML 검색의 대표 실전 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Finding a matching node then navigating to its parent for sibling data (PHP/DOM):
+```php
+$x = $xmlDoc->getElementsByTagName('ARTIST');
+for ($i = 0; $i <= $x->length - 1; $i++) {
+    if ($x->item($i)->nodeType == 1) {
+        if ($x->item($i)->childNodes->item(0)->nodeValue == $q) {
+            $y = $x->item($i)->parentNode; // step up to sibling data
+        }
+    }
+}
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.87
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[PHP Tutorial]]
+- **관련 개념:** [[PHP AJAX Database]], [[PHP XML DOM]], [[PHP AJAX Live Search]]
+- **참조 맥락:** DOM 기반 XML 검색 — 실시간 검색(AJAX Live Search) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP Example - AJAX and XML — https://www.w3schools.com/php/php_ajax_xml.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Example - AJAX and XML" page (Astra wiki-curation, P-Reinforce v3.1 format).