xpath-constraints skillA
xpath-constraints is agent-read markdown (skill) from mendixlabs/mxcli: XPath constraint syntax for MDL — retrieve WHERE clauses, page data sources, and row-level entity access, including association paths and functions. Use when writing or debugging any XPath in a project..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# XPath Constraints in MDL This skill provides reference for writing XPath constraint expressions in MDL RETRIEVE statements, page data sources, and security rules. ## When to Use This Skill - Writing `retrieve ... where [xpath]` statements in microflows - Writing `database from entity where [xpath]` in page data sources - Writing `grant ... where 'xpath'` for row-level entity access - Debugging XPath parsing or serialization issues ## XPath vs Mendix Expressions **Critical distinction**: XPath constraints (inside `[...]`) use different syntax from Mendix expressions (in SET, IF, DECLARE, etc.): | Feature | XPath `[...]` | Mendix Expression | |---------|---------------|-------------------| | Path separator | `/` (always path traversal) | `/` (also division) | | Boolean ops | lowercase: `and`, `or`, `not()` | `and`, `or`, `not` | | Negation | `not(expr)` function | `not expr` | | Empty check | `= empty`, `!= empty` | `= empty` | | Token quoting | `'[%CurrentUser%]'` (quoted) | `[%CurrentUser%]` (unquoted) | | Nested filter | `Assoc/entity[pred]` | Not applicable | | Arithmetic on value | **not supported** — pre-compute into a variable | `+`, `-`, `*`, `div`, `mod` | …
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How to install
mdr add mendixlabs/mxcli/xpath-constraints@git:20260911.f346134mdr add mendixlabs/mxcli/xpath-constraints@sha256:6c1fbce3fce5576fPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_dvx5bdyvdjiix5zh)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260911.f346134 latest | 2026-09-11 | f346134 | 14,623 B | A | view · diff |
| git:20260827.90c9049 | 2026-08-27 | 90c9049 | 14,000 B | A | view · diff |
| git:20260821.ff81a24 | 2026-08-21 | ff81a24 | 12,270 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14623 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
mendixlabs/mxcli · 124 stars · license Apache-2.0 · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dvx5bdyvdjiix5zh GET https://markdownregistry.com/api/v1/resolve?ref=mendixlabs/mxcli/xpath-constraints GET https://markdownregistry.com/api/v1/blob/6c1fbce3fce5576ff9f430f9cdd025ea6236f9eeab9d6981ecbffebb363c4890
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