
Table of Contents
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Over the past few days, some of our users have come across an error message stating a zope masking bug. This problem occurs for several reasons. We will review them below.
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Zope Templates is an HTML/XML authoring tool. This investment isLink to Zope Page Template Standards: Template Attribute Language (TAL),Syntax of expression TAL (TALES) and macro extension TAL (METAL). There is alsodescribes behavior specific to zpt which does not seem to be part of the standards.
27.1.TALïƒ Preview
Template Attribute Language (TAL) is a standard for using an attribute language.get dynamic models. Allows you to replace related elements One per documentrepeated and even omitted.
The tal directives are XML from the TAL attribute namespace.Attributes can be applied to an XML or HTML document to help you understand how it works.model.
Tal has the name one (typical name) body and (attribute).Evaluate). For example, the content
directive might look like this:
tal:content="string:Hello"
The element on which the latter is defined is the statement, the element of its mantra. MoreTAL statements only require expressions that currently have syntax and semantics that accompany the expression.expressionsNot part of TAL.TALES, which is recommended to complete.
27.1.1. ïƒ Tal Namespace
The recommended URI alias for the TAL namespace has been set.like:
xmlns:tal="http://xml currently.zope.nest URL, org/namespaces/tal"
not a good unique identifier. Expect visitorsnone solve successfully.
Zope does not require a namespace when building XML models.The content type is mit text/html
. However, this requires a namespaceXML declaration for all other content types.
27.1.2.TALI Instructions
Here are the common attribute statements:
tal:.Transform – dynamically attributes elements.
tal:define – defines variables.
tal:switch Set – Switch Test condition
tal: status.
tal:case element, enclose one if vernacular expression is toggle
tal:content content replaces the element.-
Delete the element.
tal: Omit the tag that distinguishes the content of the general element.
tal:on-error – error handling.
tal:repeat – repeat 1 element.
tal:replace – Replaces the content of the element being removed, often the Des element.leave content.
Expressions used in snippets can have any value, but most typesOperators accept only strings or can convert values to a basic string.Presentation. An expression language should define a meaningful name that doesn’t cost anything.it’s not a string. In particular value, it is considered useful to remove elements.or attributes.
27.1.3. Procedureïƒ
If there is only one valid declaration of the Partal element, in whichThe condition to be fulfilled is very simple. Starting from the root element, declarations of almost all elementsthen executed, each of its children is visited throughout the sequence to do sothe same.
Any combination-related declarations can appear on the same elements, with the exception ofcontent
should not be displayed with replace
instructions.
Directly because TAL treats instructions as XML attributes, even in HTMLIt may not be used in documents.Specify the order in which written instructions appear in the new tag.for the order to determine in many people who will be executed. TAL should of course ban thisMultiple even such as when declared on a single element, so thisenough to rank instruction styles in the priority list. Element One
if there are instructions, more than one, as they are executed in the following order:
-
define
-
Edit
-
Status
-
repeat
-
Case
-
Content or replacement
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Attributes
-
Skip tag
Because the on-error
directive is only called when an error occurs, itare not displayed in the list.
It’s probably not obvious which one will be and which one to order. The basis of thisThere must be one or more XML-based TALs. In particular, the specification Que that xmlstates XML processors are free to rewrite terms. You especiallythe attributes most commonly associated with an XML statement cannot be assumed to be inManaged order writes when a preprocessor is involved, especially inside anotherX. AvoidNo need to allow from tags but spread, still allow to run oncecomplex A tal, the order of precedence was chosen according to the exact sequenceRationale.
The reason for this in teams is that they often want to help you set it upVariables for use in scripts, others, define
therefore come first. So unimportanta statement about switching. The only thing you have to do is decide if this material fact is an elementbe included at all, so condition
follows it; it may depend on the faultFor variables that you just grouped, define
comes after. it’s worth it to be ableReplace different places of an element, each with a different amount as it iterates fromrepetition, then use repeat
followed by case
. Doesn’t make sense to youreplace aspects discard them, then attributes
is absolutely last. inWhat remains are statements that conflict because they show each of the statements that replaceelement or.
27.2. :attributes They Are Attributes Replacing Attributesïƒ
27.2.1. Syntax
tal: attribute syntax:
argument ::= [';' statement_attribute statement_attribute]*attribute_statement ::= attribute_name expressionattribute_name ::= [namespace prefix ':'] namespacename prefix ::= name
Note. If you want this “expression” to contain a semicolon it (;), mustexit by clicking on it (;;).
27.2.2. Descriptionïƒ
The directive tal:attributes
restores creates) (or the value of the componentattribute) with a dynamic value. You can qualify the sentence name withNamespace prefix, for example:
if your entire family creates an XML document with multiple namespaces. Cost FormulaIf necessary, each is converted to a string.
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