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CHAPTER 4 CONDITIONS
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quotes (and it s an easy mistake to make!) and did @flag = favorite, then you d be testing whether the flag attribute has the same value as the <favorite> child element of the context node, which isn t what you want at all.
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Whether you use single or double quotes is up to you, but XPaths in XSLT are always held within attriTip bute values, so if you use double quotes around an attribute value, and double quotes around a literal string in an XPath, then you have to escape the double quotes in the XPath with ". Similarly, if you use single quotes around an attribute value, and single quotes around a literal string in an XPath, then you have to escape the single quotes in the XPath with '. I usually use double quotes around attribute values and single quotes around literal strings in XPaths to prevent having to escape too much.
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Like most things in XML, comparisons between strings are case-sensitive. The preceding expression will only return true if the flag attribute has exactly the value favorite. The comparison will not return true for any of the following <Program> elements: <Program flag="interesting">...</Program> <Program>...</Program> <Program flag="Favorite">...</Program> <Program flag="FAVORITE">...</Program> <Program flag=" favorite ">...</Program>
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Note We ll look at how to do case-insensitive comparisons when we look at the matches() function
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later in this chapter.
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Comparison Operators
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There are two sets of comparison operators in XPath 2.0. One set performs value comparisons and the other set performs general comparisons. Value comparisons perform simple comparisons between two values. The values must be of the same type (for example, both strings or both numbers) and untyped nodes (all nodes in Basic processing) are always treated in the same way as strings. The set of value comparison operators are shown in Table 4-1. Table 4-1. Value Comparison Operators
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Operator
Example
@flag eq 'favorite'
Explanation
Returns true if the value of the flag attribute is equal to the string 'favorite' Returns true if the value of the flag attribute is not equal to the string 'favorite' Returns true if the value of the flag attribute comes before 'favorite' in alphabetical order
Not equals
@flag ne 'favorite'
Less than
@flag lt 'favorite'
CHAPTER 4 CONDITIONS
Name
Less than or equal to
Operator
Example
@flag le 'favorite'
Explanation
Returns true if the value of the flag attribute is equal to, or comes before 'favorite' in alphabetical order Returns true if the value of the flag attribute comes after 'favorite' in alphabetical order Returns true if the value of the flag attribute is equal to or comes after 'favorite' in alphabetical order
Greater than
@flag gt 'favorite'
Greater than or equal to
@flag ge 'favorite'
General comparisons can perform comparisons between sequences of values (rather than just single values) and convert untyped node values to the type of the value that you re testing against. The set of operators for performing general comparisons is shown in Table 4-2. Table 4-2. General Comparison Operators
Name
Equals
Operator
Example
@flag = 'favorite'
Explanation
Returns true if the flag attribute is equal to the string 'favorite' Returns true if the flag attribute is not equal to the string 'favorite' Returns true if the rating attribute is less than 2 Returns true if the rating attribute is less than or equal to 4 Returns true if the rating attribute is more than 8 Returns true if the rating attribute is more than or equal to 6
Not equals
@flag != 'favorite'
Less than Less than or equal to
< <=
@rating < 2 @rating <= 4
Greater than Greater than or equal to
> >=
@rating > 8 @rating >= 6
Caution If you compare the values of two nodes, those values will always be compared alphabetically rather than numerically. For example, if you had a <Program> element with a viewerRating attribute with the value '8' and criticRating with the value '10', then the comparison @viewerRating > @criticRating would be true because '8' comes before '10' alphabetically. This is a change from the behavior in XPath 1.0.
Value comparisons and general comparisons look as though they do exactly the same thing, but in fact value comparisons are stricter about the types of the arguments. Assuming that you re using a Basic XSLT processor, the test @rating lt 4 will raise an error because the
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