Can I use underscore in XML?
The XML Recommendation says that a name must begin with a letter or one of a few punctuation characters, followed by letters, digits, hyphens, underscores, or colons. This means that you are therefore limited in what characters you can use in an element name in XML. A hyphen may also be used in element names.
Can XML tag start with number?
You should not start with numbers. XML elements must follow these naming rules: Names can contain letters, numbers, and other characters. Names cannot start with a number or punctuation character.
Can XML tags have dashes?
Yes, dashes are allowed in names, whether for element names or attribute names. However a dash cannot be the first character in the name.
Which characters are illegal in XML elements?
The only illegal characters are & , < and > (as well as ” or ‘ in attributes, depending on which character is used to delimit the attribute value: attr=”must use ” here, ‘ is allowed” and attr=’must use ‘ here, ” is allowed’ ).
Can HTML tag start with underscore?
1 Answer. In short, _ as the entire attribute’s name, is considered wrong because since it is the only character it is also the first character, and as long as you are calling this an “HTML” attribute, there is indeed an HTML rule against attribute names starting with _ .
Can XML have multiple root elements?
While a properly formed XML file can only have a single root element, an XSD or DTD file can contain multiple roots. If one of the roots matches that in the XML source file, that root element is used, otherwise you need to select one to use.
Are XML cases insensitive?
XML tags are case sensitive. All XML elements must be properly nested. All XML documents must have a root element. Attribute values must always be quoted.
Does XML preserve white spaces?
In XML documents, there are two types of whitespace: Significant whitespace is part of the document content and should be preserved. Insignificant whitespace is used when editing XML documents for readability.
Is comma allowed in XML?
No, the comma is not a special character for XML.
Why do XML names begin with an underscore?
The official word is that the restriction imposed on Xml naming conventions are inherited from Xml’s parent-set SGML, with one exception only: In Xml, as an additional option, names may begin with an underscore ‘_’ character. SGML was developed by IBM in the 1960s, by a group of minds that were thinking ‘1960s style’.
What do you need to know about XML element names?
XML elements must follow these naming rules: Element names are case-sensitive Element names must start with a letter or underscore Element names cannot start with the letters xml (or XML, or Xml, etc) Element names can contain letters, digits, hyphens, underscores, and periods Element names cannot contain spaces
Can a non English letter be used in an XML document?
Non-English letters like éòá are perfectly legal in XML, but watch out for problems if your software doesn’t support them. There are no naming styles defined for XML elements. But here are some commonly used: If you choose a naming style, it is good to be consistent! XML documents often have a corresponding database.
Can a colon be used in an XML element?
Colons are reserved for namespaces (more later). Non-English letters like éòá are perfectly legal in XML, but watch out for problems if your software doesn’t support them. There are no naming styles defined for XML elements. But here are some commonly used: