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At 8 Jul 1999 18:24 -0700, G. Ken Holman wrote: > According to 6.1.1 there are 12 axes you can choose from when building a > pattern: > > [5] AxisIdentifier ::= 'from-ancestors' > | 'from-ancestors-or-self' > | 'from-attributes' > | 'from-children' > | 'from-descendants' > | 'from-descendants-or-self' > | 'from-following' > | 'from-following-siblings' > | 'from-parent' > | 'from-preceding' > | 'from-preceding-siblings' > | 'from-self' These are good for location paths, but not for patterns. Section 6.3 states: A pattern must match the grammar for Pattern. A Pattern is set of location path patterns separated by |. A location path pattern is a location path none of the steps of which use either AxisIdentifiers or . or ... Location path patterns can also start with an id() or key() function call with a literal argument (see [6.2.2 Node-sets]). Predicates in a pattern can use arbitrary expressions just like predicates in a location path. > And according to 6.1.4 there are abbreviations available to be used to > address 5 of the axes: > > . refers to from-self > @name refers to from-attributes (name of "*" means "all") > name refers to from-children (name of "*" means "all") > .. refers to from-parent > // refers to from-descendants But you can't use "." or ".." in a pattern. > When the pattern starts with "/", the orientation is from the root of the > tree. > > The pattern can be comprised of a number of location steps, each step > delimited by "/". > > The function id() described in 6.2.2 allows you to, in a location step, > refer to a node or nodes with unique identifiers. Provided you specify the ID as a literal string. > The function key() is similar to id() in that it allows you to refer to a > node or nodes elsewhere in the document, but it does so without the > reference needing to be a node with a unique identifier. There is a short > description of the power of the key() function in the free resources > section of our web site. Provided you use literal arguments. Regards, Tony Graham ====================================================================== Tony Graham mailto:tgraham@m... Mulberry Technologies, Inc. http://www.mulberrytech.com 17 West Jefferson Street Direct Phone: 301/315-9632 Suite 207 Phone: 301/315-9631 Rockville, MD 20850 Fax: 301/315-8285 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in SGML and XML ====================================================================== xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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