constraint on schema スキーマの制約 contains a formal constraint, typically expressed in a rule-based schema language, to which a construct must conform in order to be considered valid 〔データの〕構造が妥当であるために満たしていなければならない形式的な制約。 通常は規則ベースのスキーマ言語で表現される。 This constraintSpec element has a mode= of "delete" even though it has child elements. Change the mode= to "add", "change", or "replace", or remove the child elements. This constraintSpec element has a mode= of "change", but does not have any child elements. Specify child elements, or change the mode= to "delete". This constraintSpec element has a mode= of "", but does not have a child 'constraint' element. Use a child 'constraint' element or change the mode= to "delete" or "change". Relationship between scheme attribute and contents: Schematron 1.x Rules in the Schematron 1.* language must be inside a constraintSpec with a value other than 'schematron' or 'isoschematron' on the scheme attribute Relationship between scheme attribute and contents: ISO Schematron Rules in the ISO Schematron language must be inside a constraintSpec with the value 'schematron' on the scheme attribute An <sch:assert> or <sch:report> element must be a descendant of an <sch:rule> that has a @context; one or more inside this are not. The @ident of 'constraintSpec' should be unique; this one () is the same as that of a previous 'constraintSpec'. supplies the name of the language in which the constraints are defined 制約を定義する言語名を示す。 The @scheme attribute of <constraintSpec> is required when the @mode is (here on "") ISO Schematron ISO スキマトロン

These Guidelines no longer recommend, and the current TEI stylesheets no longer support, the use of Schematron 1.x within constraintSpec. Thus the value schematron is used to indicate that ISO Schematron is used within the constraintSpec.

The scheme attribute is required when the value of mode is add or replace. The scheme attribute is permitted when the value of mode is delete, but these Guidelines make no reccomendation for what a processor should do if its value does not match that of the constraintSpec being deleted.

constraintSpecでのSchematron 1.xの利用は、このガイドラインでは推奨せず最近のTEIスタイルシートでもサポートしない。 それ故、schematronの値はISO SchematronがconstraintSpecで用いられることを示すのに使う。

 characterizes the constraintSpec element in some sense; used to indicate when a constraintSpec warns about a deprecated construct. Indicates that this constraint specification warns that some other construct in the schema is deprecated.

This constraint uses Schematron to enforce the presence of the spanTo attribute (which comes from an attribute class) on the addSpan element:

Enforce the presence of the spanTo attribute The spanTo= attribute of is required. Implement an accessibility rule which says that pictures should have textual explanations You should provide information in a figure from which we can construct an alt attribute in HTML

This constraint uses SPITBOL (a language which is not expressed in XML) to check whether the title and author are identical:

(output = leq(title,author) "title and author cannot be the same")

A child constraint is required when the mode attribute has the value replace or add (or is not specified, as add is the default). No child elements are permitted when the mode attribute has the value delete. At least one child element is required when the mode attribute has the value change.