Differences

This shows you the differences between two versions of the page.

--- tanszek:oktatas:techcomm:xml_2 [2024/10/07 17:25] – created knehez
+++ tanszek:oktatas:techcomm:xml_2 [2024/10/07 17:30] (current) – [XML Namespaces] knehez
@@ Line 2: / Line 2: @@
 <sxh xml>
-<?xml version='1.0' encoding='ISO-8859-2' ?>
+<?xml version='1.0' encoding='UTF-8' ?>
 <!-- first XML example -->
 <message id="123456">
@@ Line 55: / Line 55: @@
 Since creators of XML documents use their own vocabulary to build XML, **name conflicts** are possible. For example, the ''<student>'' tag might be too generic. Using **namespace prefixes**, the element can be specialized:
+<sxh xml>
-    <miskolc:student>Johj Smith</miskolc:student>
+<miskolc:student>John Smith</miskolc:student>
+</sxh>
 Here, the qualified element is ''student'' and the namespace prefix is ''miskolc''.
@@ Line 72: / Line 72: @@
 In this example, the namespace prefix ''unimiskolc'' is defined to avoid name conflicts, and it links the data to the **www.uni-miskolc.hu** namespace.
+==== XML Interpreters ====
+**XML interpreters** process XML documents by performing **syntactic validation**.
+=== Definition ===
+An XML document is considered **"well-formed"** if it is **syntactically flawless**.
+This means:
+- It has a **single root element**.
+- Every opening tag has a corresponding closing tag.
+- The attributes are properly specified.
+Therefore, the term **"well-formed"** does not refer to the visual formatting of the XML file with tabs, spaces, or its human-readable structure!
+=== Example ===
+<sxh xml>
+<root><element>abc</element><a>this worng<b></root>
+</sxh>
+This XML is **syntactically incorrect** because the `<a>` tag is not closed.
+=== Example ===
+The following example is neatly formatted but still **not well-formed**:
+<sxh xml>
+<CONTACT>
+   <NAME>Frank Lee</NAME>
+   <EMAIL>flee@flee.com
+</CONTACT>
+</sxh>
+Here’s the correct version:
+<sxh xml>
+<CONTACT>
+   <NAME>Frank Lee</NAME>
+   <EMAIL>flee@flee.com</EMAIL>
+</CONTACT>
+</sxh>
+What’s the difference? In the incorrect version, the `<EMAIL>` tag is not closed, causing the document to be invalid, even though it is visually well-structured.