for information about XES schema see these
pages.
Constant
This node is used to hold a single constant value (known as a 'literal'). A
nodeConstant holds one of the following types of literal: 'IntegerLiteral',
'FloatingPointLiteral', 'BooleanLiteral', 'CharacterLiteral', 'StringLiteral'
or 'NullLiteral'
An integer literal may be expressed in decimal (base 10), hexadecimal (base
16), or octal (base 8):
A floating-point literal consists of two intergers, a mantissa part and an
exponent. This may be represented by a number containing a decimal point '.'
or an exponent 'e' or both. Both the mantissa and the exponent may have a negative
sign.
A boolean literal may have the values 'true' or 'false'.
A character literal contains 'SingleCharacter' or 'EscapeSequence'
Attributes used
Only one of the following attributes may be used: "constantType","intConst","stringValue","floatValue","doubleValue","booleanValue".
Child Elements
The only child elements allowed are comments.
Schema entry
Holds a constant string, integer, floating point or boolean value
<xs:complexType name="constantType">
<xs:attribute name="intConst" type="xs:int"/>
<xs:attribute name="stringValue" type="xs:string"/>
<xs:attribute name="floatValue" type="xs:float"/>
<xs:attribute name="doubleValue" type="xs:double"/>
<xs:attribute name="booleanValue" type="xs:boolean"/>
</xs:complexType>
Examples of usage
| usage |
java example |
XES example |
| integer constant |
0; |
<constant intConst="0"/>
|
| negative integer constant |
i = -1; |
<assign operator="=">
<variable name="i"/>
<constant intConst="1"/>
</assign> |
| long integer |
3L; |
<constant stringConst="3L"/> |
| floating point constant (default is double) |
0.1; |
<constant doubleConst="0.1"/> |
| floating point constant, explicitly declaired as float |
0.2f; |
<constant doubleConst="0.2"/> |
| floating point constant, explicitly declaired as double |
0.3d; |
<constant doubleConst="0.3"/> |
| floating point with exponent |
5e-6; |
<constant doubleConst="5.0E-6"/> |
| boolean constant |
true; |
<constant boolConst="true"/> |
| character constant |
'c'; |
<constant stringConst="'c'"/> |
| unicode character |
char c = '\uFFFF'; |
<variable name="c" type="char">
<assign operator="=">
<constant stringConst="'?'"/>
</assign>
</variable> |
| octal |
0777; |
<constant intConst="777"> |
| hexadecimal |
0x7fff; |
<constant stringConst="0x7fff"> |
| string constant |
"string"; |
<constant stringConst=""string""/> |
| null reference |
null; |
<constant stringConst="null"/> |
| array initialiser list |
int v[]={1,2,3,4}; |
<variable isArray="true" name="v" type="int">
<assign operator="=">
<array>
<constant intConst="1"/>
<constant intConst="2"/>
<constant intConst="3"/>
<constant intConst="4"/>
</array>
</assign>
</variable> |
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metadata block
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| see also: |
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| Correspondence about this page |
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Book Shop - Further reading.
Where I can, I have put links to Amazon for books that are relevant to
the subject, click on the appropriate country flag to get more details
of the book or to buy it from them.
|
Processing XML with Java: A Guide to SAX, DOM, JDOM, JAXP, and TrAX
Other Java books
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Commercial Software Shop
Where I can, I have put links to Amazon for commercial software, not
directly related to this site, but related to the subject being discussed,
click on the appropriate country flag to get more details of the software
or to buy it from them.
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JBuilder - There is also a free version of Jbuilder at borland
website . However its licence conditions are quite restrictive so you may
prefer another java IDE.
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Can this page be improved?
Please send me any improvements to
here. I would appreciate ideas to make the pages more useful including
error correction, ideas for new pages, improvements to wording. It helps
if you quote the full URL of the page.
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progam
I am working on a project which uses these principles, if you would like
to help me with this you are welcome to join in, here:
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for xml encoding: http://sourceforge.net/projects/xes/
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