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The Dublin Core metadata element set
is a standard for cross-domain information resource description.
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| Element | Description | Value |
|---|---|---|
| Identifier | resource ID | http://old.zope.org/Members/ivo/SetTag |
| Title | resource name | <dtml-set> tag product |
| Description | resource summary | dtml-set (c) Ivo van der Wijk, Amaze Internet Services ([email protected]) What does it do? ---------------- This product implements a <dtml-set> tag that enables dtml coders to set variables transparently. It basically replaces those ugly (and error prone) <dtml-call "REQUEST.set(foo, 10)"> calls. It also provides an 'optional' tag, which will only do the assignment if the target variable previously didn't exist, previously equivalent to: <dtml-unless foo> <dtml-call "REQUEST.set(foo, 10)"> </dtml-unless> Why not dtml-let? ----------------- dtml-let requires a block, which can be usefull to keep the changed namespace local and clean, but it makes it really hard to make a variable available in your entire dtml document/method. Why not dtml-eval? ------------------ dtml-eval (another similar external product) requires a block structure. Assignments within this blockstructure are global within your dtml document/ method, but I like the shorter dtml-set notation. Also, it lacks the 'optional' tag. Examples -------- - set some variables <dtml-set i="20" j="somePythonMethod(10,20)"> <dtml-set q=j> (assigns previously set j to q) <dtml-set name="'John Doe'" optional> (only assings if name was undefined) <dtml-set i="20"> <dtml-set j="i+5"> <dtml-var j> (will print 25) Pitfalls --------- Assigning a string has to be done using a python expression, which has to be enclosed in "", i.e. <dtml-set my_str="'Hello world'"> dtml-set is not limited by the scope of other tags, i.e. <dtml-let foo=5> <dtml-set bar=foo> </dtml-let> <dtml-var bar> Will work fine. TODO list --------- - Some code cleanups, regular expression optimizations - Rewrite this document in structured text format - <dtml-set optional> works without warning. - the behaviour is undefined if 'optional' is not placed at the end. |
| Creator | resource creator | ZopeOrgSite |
| Date | default date | 2001-07-19 05:43:39 |
| Format | resource format | text/html |
| Type | resource type | Software Package |
| Subject | resource keywords | Developer, Visual |
| Contributors | resource collaborators | |
| Language | resource language | |
| Publisher | resource publisher | No publisher |
| Rights | resource copyright | |
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| Element | Description | Value |
| CreationDate | date resource created | 2001-07-19 05:43:39 |
| ModificationDate | date resource last modified | 2001-07-19 05:43:39 |
| EffectiveDate | date resource becomes effective | None |
| ExpirationDate | date resource expires | None |
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